186 results on '"Bröder, Lisa"'
Search Results
2. Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic
- Author
-
Thomas, Maxime, Monhonval, Arthur, Hirst, Catherine, Bröder, Lisa, Zolkos, Scott, Vonk, Jorien E., Tank, Suzanne E., Keskitalo, Kirsi H., Shakil, Sarah, Kokelj, Steven V., van der Sluijs, Jurjen, and Opfergelt, Sophie
- Published
- 2023
- Full Text
- View/download PDF
3. Rapid Ice‐Wedge Collapse and Permafrost Carbon Loss Triggered by Increased Snow Depth and Surface Runoff
- Author
-
Parmentier, Frans‐Jan W., primary, Nilsen, Lennart, additional, Tømmervik, Hans, additional, Meisel, Ove H., additional, Bröder, Lisa, additional, Vonk, Jorien E., additional, Westermann, Sebastian, additional, Semenchuk, Philipp R., additional, and Cooper, Elisabeth J., additional
- Published
- 2024
- Full Text
- View/download PDF
4. Selective Sorting and Degradation of Permafrost Organic Matter in the Nearshore Zone of Herschel Island (Yukon, Canada)
- Author
-
Jong, Dirk, primary, Bröder, Lisa, additional, Tesi, Tommaso, additional, Tanski, George, additional, Oudenhuijsen, Mickolai, additional, Fritz, Michael, additional, Lantuit, Hugues, additional, Haghipour, Negar, additional, Eglinton, Timothy, additional, and Vonk, Jorien, additional
- Published
- 2024
- Full Text
- View/download PDF
5. Rivers across the Siberian Arctic unearth the patterns of carbon release from thawing permafrost
- Author
-
Wild, Birgit, Andersson, August, Bröder, Lisa, Vonk, Jorien, Hugelius, Gustaf, McClelland, James W., Song, Wenjun, Raymond, Peter A., and Gustafsson, Örjan
- Published
- 2019
6. Radiocarbon signatures of carbon phases exported by Swiss rivers in the Anthropocene
- Author
-
Rhyner, Timo M. Y., primary, Bröder, Lisa, additional, White, Margot E., additional, Mittelbach, Benedict V. A., additional, Brunmayr, Alexander, additional, Hagedorn, Frank, additional, Storck, Florian R., additional, Passera, Lucas, additional, Haghipour, Negar, additional, Zobrist, Juerg, additional, and Eglinton, Timothy I., additional
- Published
- 2023
- Full Text
- View/download PDF
7. The Modern Ocean Sediment Archive and Inventory of Carbon (MOSAIC): version 2.0
- Author
-
Paradis, Sarah, primary, Nakajima, Kai, additional, Van der Voort, Tessa S., additional, Gies, Hannah, additional, Wildberger, Aline, additional, Blattmann, Thomas M., additional, Bröder, Lisa, additional, and Eglinton, Timothy I., additional
- Published
- 2023
- Full Text
- View/download PDF
8. Seasonal carbon dynamics of the Kolyma River tributaries, Siberia
- Author
-
Keskitalo, Kirsi H., primary, Bröder, Lisa, additional, Tesi, Tommaso, additional, Mann, Paul J., additional, Jong, Dirk J., additional, Bulte Garcia, Sergio, additional, Davydova, Anna, additional, Davydov, Sergei, additional, Zimov, Nikita, additional, Haghipour, Negar, additional, Eglinton, Timothy I., additional, and Vonk, Jorien E., additional
- Published
- 2023
- Full Text
- View/download PDF
9. Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia.
- Author
-
Keskitalo, Kirsi H., Bröder, Lisa, Tesi, Tommaso, Mann, Paul J., Jong, Dirk J., Bulte Garcia, Sergio, Davydova, Anna, Davydov, Sergei, Zimov, Nikita, Haghipour, Negar, Eglinton, Timothy I., and Vonk, Jorien E.
- Subjects
COLLOIDAL carbon ,GLOBAL warming ,CARBON emissions ,RADIOCARBON dating ,CARBON cycle ,TUNDRAS - Abstract
Arctic warming is causing permafrost thaw and release of organic carbon (OC) to fluvial systems. Permafrost-derived OC can be transported downstream and degraded into greenhouse gases that may enhance climate warming. Susceptibility of OC to decomposition depends largely upon its source and composition, which vary throughout the seasonally distinct hydrograph. Most studies on carbon dynamics to date have focused on larger Arctic rivers, yet little is known about carbon cycling in lower-order rivers and streams. Here, we characterize the composition and sources of OC, focusing on less studied particulate OC (POC), in smaller waterways within the Kolyma River watershed. Additionally, we examine how watershed characteristics control carbon concentrations. In lower-order systems, we find rapid initiation of primary production in response to warm water temperatures during spring freshet, shown by decreasing δ13 C-POC, in contrast to larger rivers. This results in CO 2 uptake by primary producers and microbial degradation of mainly autochthonous OC. However, if terrestrially derived inorganic carbon is assimilated by primary producers, part of it is returned via CO 2 emissions if the autochthonous OC pool is simultaneously degraded. As Arctic warming and hydrologic changes may increase OC transfer from smaller waterways to larger river networks, understanding carbon dynamics in smaller waterways is crucial. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
10. Utilization, release, and long-term fate of ancient carbon from eroding permafrost coastlines
- Author
-
Ruben, Manuel, Marchant, Hannah, Wietz, Matthias, Gentz, Torben, Galy, Valier, Bröder, Lisa, Strauss, Jens, and Mollenhauer, Gesine
- Abstract
About 34% of global coast lines are underlain by permafrost. Rising temperatures cause an acceleration in erosion rates of up to 10s of meters annually, exporting increasing amounts of carbon and nutrients to the coastal ocean. The degradation of ancient organic carbon (OC) from permafrost is an important potential feedback mechanism in a warming climate. However, little is known about permafrost OC degradation after entering the ocean and its long term-fate after redeposition on the sea floor. Some recent studies have revealed CO2 release to occur when ancient permafrost materials are incubated with sea water. However, despite its importance for carbon feedback mechanisms, no study has directly assessed whether this CO2 release is indeed derived from respiration of ancient permafrost OC. We used a multi-disciplinary approach incubating Yedoma permafrost from the Lena Delta in natural coastal seawater from the south-eastern Kara Sea. By combining biogeochemical analyses, DNA-sequencing, ramped oxidation, pyrolysis and stable and radiocarbon isotope analysis we were able to: 1) quantify CO2 emissions from permafrost utilization; 2) for the first time demonstrate the amount of ancient OC contributing to CO2 emissions; 3) link the processes to specific microbial communities; and 4) characterize and assess lability of permafrost OC after redeposition on the sea floor. Our data clearly indicate high bioavailability of permafrost OC and rapid utilization after thawed material has entered the water column, while observing only minor changes in permafrost OC composition over time. Microbial communities are distinctly different in suspended Yedoma particles and water. Overall, our results suggest that under anthropogenic Arctic warming, enhanced coastal erosion will result in increased greenhouse gas emissions, as formerly freeze-locked ancient permafrost OC is remineralized by microbial communities when released to the coastal ocean.
- Published
- 2023
11. Nunataryuk field campaigns: understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region
- Author
-
Lizotte, Martine, primary, Juhls, Bennet, additional, Matsuoka, Atsushi, additional, Massicotte, Philippe, additional, Mével, Gaëlle, additional, Anikina, David Obie James, additional, Antonova, Sofia, additional, Bécu, Guislain, additional, Béguin, Marine, additional, Bélanger, Simon, additional, Bossé-Demers, Thomas, additional, Bröder, Lisa, additional, Bruyant, Flavienne, additional, Chaillou, Gwénaëlle, additional, Comte, Jérôme, additional, Couture, Raoul-Marie, additional, Devred, Emmanuel, additional, Deslongchamps, Gabrièle, additional, Dezutter, Thibaud, additional, Dillon, Miles, additional, Doxaran, David, additional, Flamand, Aude, additional, Fell, Frank, additional, Ferland, Joannie, additional, Forget, Marie-Hélène, additional, Fritz, Michael, additional, Gordon, Thomas J., additional, Guilmette, Caroline, additional, Hilborn, Andrea, additional, Hussherr, Rachel, additional, Irish, Charlotte, additional, Joux, Fabien, additional, Kipp, Lauren, additional, Laberge-Carignan, Audrey, additional, Lantuit, Hugues, additional, Leymarie, Edouard, additional, Mannino, Antonio, additional, Maury, Juliette, additional, Overduin, Paul, additional, Oziel, Laurent, additional, Stedmon, Colin, additional, Thomas, Crystal, additional, Tisserand, Lucas, additional, Tremblay, Jean-Éric, additional, Vonk, Jorien, additional, Whalen, Dustin, additional, and Babin, Marcel, additional
- Published
- 2023
- Full Text
- View/download PDF
12. 14C-based deconvolution of relationships between carbon pools in Icelandic rivers and streams
- Author
-
Gallarotti, Nora, primary, Bröder, Lisa, additional, Lattaud, Julie, additional, Haghipour, Negar, additional, and Eglinton, Timothy, additional
- Published
- 2023
- Full Text
- View/download PDF
13. A new UV-Oxidation set up for AMS radiocarbon analysis for small dissolved organic carbon in marine and fresh water samples
- Author
-
Haghipour, Negar, primary, Lupker, Maarten, additional, Wacker, Lukas, additional, White, Margot, additional, Bröder, Lisa, additional, and Eglinton, Timothy I., additional
- Published
- 2023
- Full Text
- View/download PDF
14. Cross-Shelf Transport, Composition and Degradation of Terrestrial Permafrost Organic Matter at the Sediment-Water Interface in the Laptev and East Siberian Seas
- Author
-
Madaj, Lina, primary, Keskitalo, Kirsi, additional, Gustafsson, Örjan, additional, Tesi, Tommaso, additional, Semiletov, Igor, additional, Dudarev, Oleg, additional, Martens, Jannik, additional, Haghipour, Negar, additional, Bröder, Lisa, additional, and Vonk, Jorien, additional
- Published
- 2023
- Full Text
- View/download PDF
15. Fate of Fire altered Organic Carbon in the arctic river-to-ocean continuum: Resolving Mackenzie River Black Carbon in the Beaufort Sea
- Author
-
Speidel, Linn G., primary, Bröder, Lisa, additional, Lattaud, Julie, additional, Haghipour, Negar, additional, Eglinton, Timothy I., additional, and Coppola, Alysha I., additional
- Published
- 2023
- Full Text
- View/download PDF
16. Radiocarbon signatures of carbon phases exported by swiss rivers in the Anthropocene
- Author
-
Rhyner, Timo, primary, Bröder, Lisa, additional, White, Margot, additional, Mittelbach, Benedict, additional, Storck, Florian, additional, Passera, Lucas, additional, Haghipour, Negar, additional, and Eglinton, Timothy, additional
- Published
- 2023
- Full Text
- View/download PDF
17. Nunataryuk field campaigns: understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region
- Author
-
Lizotte, Martine, Juhls, Bennet, Matsuoka, Atsushi, Massicotte, Philippe, Mével, Gaëlle, Anikina, David Obie James, Antonova, Sofia, Bécu, Guislain, Béguin, Marine, Bélanger, Simon, Bossé-Demers, Thomas, Bröder, Lisa, Bruyant, Flavienne, Chaillou, Gwénaëlle, Comte, Jérôme, Couture, Raoul-Marie, Devred, Emmanuel, Deslongchamps, Gabrièle, Dezutter, Thibaud, Dillon, Miles, Doxaran, David, Flamand, Aude, Fell, Frank, Ferland, Joannie, Forget, Marie-Hélène, Fritz, Michael, Gordon, Thomas J, Guilmette, Caroline, Hilborn, Andrea, Hussherr, Rachel, Irish, Charlotte, Joux, Fabien, Kipp, Lauren, Laberge-Carignan, Audrey, Lantuit, Hugues, Leymarie, Edouard, Mannino, Antonio, Maury, Juliette, Overduin, Paul, Oziel, Laurent, Stedmon, Colin, Thomas, Crystal, Tisserand, Lucas, Tremblay, Jean-Éric, Vonk, Jorien, Whalen, Dustin, Babin, Marcel, Lizotte, Martine, Juhls, Bennet, Matsuoka, Atsushi, Massicotte, Philippe, Mével, Gaëlle, Anikina, David Obie James, Antonova, Sofia, Bécu, Guislain, Béguin, Marine, Bélanger, Simon, Bossé-Demers, Thomas, Bröder, Lisa, Bruyant, Flavienne, Chaillou, Gwénaëlle, Comte, Jérôme, Couture, Raoul-Marie, Devred, Emmanuel, Deslongchamps, Gabrièle, Dezutter, Thibaud, Dillon, Miles, Doxaran, David, Flamand, Aude, Fell, Frank, Ferland, Joannie, Forget, Marie-Hélène, Fritz, Michael, Gordon, Thomas J, Guilmette, Caroline, Hilborn, Andrea, Hussherr, Rachel, Irish, Charlotte, Joux, Fabien, Kipp, Lauren, Laberge-Carignan, Audrey, Lantuit, Hugues, Leymarie, Edouard, Mannino, Antonio, Maury, Juliette, Overduin, Paul, Oziel, Laurent, Stedmon, Colin, Thomas, Crystal, Tisserand, Lucas, Tremblay, Jean-Éric, Vonk, Jorien, Whalen, Dustin, and Babin, Marcel
- Abstract
Climate warming and related drivers of soil thermal change in the Arctic are expected to modify the distribution and dynamics of carbon contained in perennially frozen grounds. Thawing of permafrost in the Mackenzie River watershed of northwestern Canada, coupled with increases in river discharge and coastal erosion, triggers the release of terrestrial organic matter (OMt) from the largest Arctic drainage basin in North America into the Arctic Ocean. While this process is ongoing and its rate is accelerating, the fate of the newly mobilized organic matter as it transits from the watershed through the delta and into the marine system remains poorly understood. In the framework of the European Horizon 2020 Nunataryuk programme, and as part of the Work Package 4 (WP4) Coastal Waters theme, four field expeditions were conducted in the Mackenzie Delta region and southern Beaufort Sea from April to September 2019. The temporal sampling design allowed the survey of ambient conditions in the coastal waters under full ice cover prior to the spring freshet, during ice breakup in summer, and anterior to the freeze-up period in fall. To capture the fluvial-marine transition zone, and with distinct challenges related to shallow waters and changing seasonal and meteorological conditions, the field sampling was conducted in close partnership with members of the communities of Aklavik, Inuvik and Tuktoyaktuk, using several platforms, namely helicopters, snowmobiles, and small boats. Water column profiles of physical and optical variables were measured in situ, while surface water, groundwater, and sediment samples were collected and preserved for the determination of the composition and sources of OMt, including particulate and dissolved organic carbon (POC and DOC), and colored dissolved organic matter (CDOM), as well as a suite of physical, chemical, and biological variables. Here we present an overview of the standardized datasets, including hydrographic profiles, remote sensing
- Published
- 2023
18. Nunataryuk field campaigns:understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region
- Author
-
Lizotte, Martine, Juhls, Bennet, Matsuoka, Atsushi, Massicotte, Philippe, Mével, Gaëlle, Anikina, David Obie James, Antonova, Sofia, Bécu, Guislain, Béguin, Marine, Bélanger, Simon, Bossé-Demers, Thomas, Bröder, Lisa, Bruyant, Flavienne, Chaillou, Gwénaëlle, Comte, Jérôme, Couture, Raoul Marie, Devred, Emmanuel, Deslongchamps, Gabrièle, Dezutter, Thibaud, Dillon, Miles, Doxaran, David, Flamand, Aude, Fell, Frank, Ferland, Joannie, Forget, Marie Hélène, Fritz, Michael, Gordon, Thomas J., Guilmette, Caroline, Hilborn, Andrea, Hussherr, Rachel, Irish, Charlotte, Joux, Fabien, Kipp, Lauren, Laberge-Carignan, Audrey, Lantuit, Hugues, Leymarie, Edouard, Mannino, Antonio, Maury, Juliette, Overduin, Paul, Oziel, Laurent, Stedmon, Colin, Thomas, Crystal, Tisserand, Lucas, Tremblay, Jean Éric, Vonk, Jorien, Whalen, Dustin, Babin, Marcel, Lizotte, Martine, Juhls, Bennet, Matsuoka, Atsushi, Massicotte, Philippe, Mével, Gaëlle, Anikina, David Obie James, Antonova, Sofia, Bécu, Guislain, Béguin, Marine, Bélanger, Simon, Bossé-Demers, Thomas, Bröder, Lisa, Bruyant, Flavienne, Chaillou, Gwénaëlle, Comte, Jérôme, Couture, Raoul Marie, Devred, Emmanuel, Deslongchamps, Gabrièle, Dezutter, Thibaud, Dillon, Miles, Doxaran, David, Flamand, Aude, Fell, Frank, Ferland, Joannie, Forget, Marie Hélène, Fritz, Michael, Gordon, Thomas J., Guilmette, Caroline, Hilborn, Andrea, Hussherr, Rachel, Irish, Charlotte, Joux, Fabien, Kipp, Lauren, Laberge-Carignan, Audrey, Lantuit, Hugues, Leymarie, Edouard, Mannino, Antonio, Maury, Juliette, Overduin, Paul, Oziel, Laurent, Stedmon, Colin, Thomas, Crystal, Tisserand, Lucas, Tremblay, Jean Éric, Vonk, Jorien, Whalen, Dustin, and Babin, Marcel
- Abstract
Climate warming and related drivers of soil thermal change in the Arctic are expected to modify the distribution and dynamics of carbon contained in perennially frozen grounds. Thawing of permafrost in the Mackenzie River watershed of northwestern Canada, coupled with increases in river discharge and coastal erosion, triggers the release of terrestrial organic matter (OMt) from the largest Arctic drainage basin in North America into the Arctic Ocean. While this process is ongoing and its rate is accelerating, the fate of the newly mobilized organic matter as it transits from the watershed through the delta and into the marine system remains poorly understood. In the framework of the European Horizon 2020 Nunataryuk programme, and as part of the Work Package 4 (WP4) Coastal Waters theme, four field expeditions were conducted in the Mackenzie Delta region and southern Beaufort Sea from April to September 2019. The temporal sampling design allowed the survey of ambient conditions in the coastal waters under full ice cover prior to the spring freshet, during ice breakup in summer, and anterior to the freeze-up period in fall. To capture the fluvial-marine transition zone, and with distinct challenges related to shallow waters and changing seasonal and meteorological conditions, the field sampling was conducted in close partnership with members of the communities of Aklavik, Inuvik and Tuktoyaktuk, using several platforms, namely helicopters, snowmobiles, and small boats. Water column profiles of physical and optical variables were measured in situ, while surface water, groundwater, and sediment samples were collected and preserved for the determination of the composition and sources of OMt, including particulate and dissolved organic carbon (POC and DOC), and colored dissolved organic matter (CDOM), as well as a suite of physical, chemical, and biological variables. Here we present an overview of the standardized datasets, including hydrographic profiles, remote sens
- Published
- 2023
19. Seasonal carbon dynamics of the Kolyma River tributaries, Siberia.
- Author
-
Keskitalo, Kirsi H., Bröder, Lisa, Tesi, Tommaso, Mann, Paul J., Jong, Dirk J., Garcia, Sergio Bulte, Davydova, Anna, Davydov, Sergei, Zimov, Nikita, Haghipour, Negar, Eglinton, Timothy I., and Vonk, Jorien E.
- Subjects
GLOBAL warming ,SEASONS ,CARBON ,GREENHOUSE gases ,TUNDRAS ,PERMAFROST - Abstract
Arctic warming is causing permafrost thaw and release of organic carbon (OC) to fluvial systems. Permafrost-derived OC can be transported downstream and degraded into greenhouse gases that may enhance climate warming. Susceptibility of OC to decomposition depends largely upon its source and composition which varies throughout the seasonally distinct hydrograph. Most studies to date have focused on larger Arctic rivers, yet little is known about carbon dynamics in lower order rivers/streams. Here, we characterize composition and sources of OC, focusing on less studied particulate OC (POC), in smaller waterways within the Kolyma River watershed. Additionally, we examine how watershed characteristics control carbon concentrations. In lower order systems, we find rapid initiation of primary production in response to warm weather, shown by decreasing δ
13 C-POC, in contrast to larger rivers. As Arctic warming and hydrologic changes may increase OC transfer from smaller waterways through river networks this may intensify inland water carbon outgassing. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
20. Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf
- Author
-
Jong, Dirk, primary, Bröder, Lisa, additional, Tesi, Tommaso, additional, Keskitalo, Kirsi H., additional, Zimov, Nikita, additional, Davydova, Anna, additional, Pika, Philip, additional, Haghipour, Negar, additional, Eglinton, Timothy I., additional, and Vonk, Jorien E., additional
- Published
- 2023
- Full Text
- View/download PDF
21. Grain size specific authigenic Nd isotope compositions in the Northwest Atlantic Ocean – Ubiquity of authigenic phases and impacts of boundary exchange processes
- Author
-
Rickli, Jörg, primary, Tallon, Marie, additional, Bamberg, Cédric, additional, Suhrhoff, Tim Jesper, additional, Bruni, Elena, additional, Bröder, Lisa, additional, and Eglinton, Timothy, additional
- Published
- 2023
- Full Text
- View/download PDF
22. Tracking Holocene paleoenvironmental conditions in the Beaufort Sea and their relation to sea ice variability
- Author
-
Santos, Madeleine, primary, Hernández-Almeida, Iván, additional, Lattaud, Julie, additional, O’Regan, Matt, additional, Bosse-Demers, Thomas, additional, Fritz, Michael, additional, Juhls, Bennet, additional, Overduin, Paul, additional, Pellerin, André, additional, Priest, Taylor, additional, Rudback, Daniel, additional, Whalen, Dustin, additional, and Bröder, Lisa, additional
- Published
- 2023
- Full Text
- View/download PDF
23. Grain size controls on long-chain diol distributions and proxy signals in marine sediments
- Author
-
Lattaud, Julie, Eglinton, Timothy Ian, Tallon, Marie, Bröder, Lisa, Erdem, Zeynep, and Ausín, Blanca
- Subjects
hydrodynamic sorting ,LDI ,SST ,DI ,long-chain diols - Abstract
Long chain alkyl diols (LCDs) are lipid biomarkers that occur ubiquitously in sediments. Their abundance and distributions are increasingly used as the basis of molecular proxies for environmental parameters such as sea surface temperature (SST) via the Long chain Diol Index (LDI), and upwelling intensity and nutrient conditions (parametrized as diol indices, DI-2, and Nutrient Diol Index, NDI, respectively). Their marine producers remain the subject of debate, but in cultures, they can be found within the outer wall (algaenan) of eustigmatophytes or in Proboscia diatoms. LCDs appear to be well preserved in sediments, potentially as a result of their association with algaenan and/or minerals, but little is known of their pre-depositional histories, in particular transport dynamics. Here, 15 surface continental margin sediments as well as one high-deposition-rate sediment core (50 cm, spanning the last ~30 years) were analyzed in order to evaluate the impact of organo-mineral associations, lateral transport, and hydrodynamic sorting on sedimentary LCD signals. The abundance and distribution of LCDs in bulk sediments and corresponding grain-size fractions was determined. The highest proportion of all LCD isomers is found in the fine fraction (2 – 10 µm), which also holds the highest proportion of organic matter in relation to the other grain-size fractions. However, LCDs are also found in the other fractions (sand, coarse silt, and clay), and their concentrations are not correlated with bulk organic carbon content, indicating different preservation or transport mechanisms. LDI-SST in the bulk sediment is comparable to the mean annual SST at all sites except those influenced by upwelling and characterized by strong seasonal SST gradients. To the contrary of other biomarker-related proxies (e.g., alkenones), lateral transport does not appear to strongly affect LDI-SST in size fractions, suggesting that the intimate relationship of LCD with the algaenan may counteract the influence of hydrodynamic mineral sorting processes on related proxy signals. The difference between the fraction-weighted LCD concentration and bulk sedimentary LCD concentration indicates potential release of LCD during laboratory fractionation, suggesting degradation of algaenan or dissolution of opal frustules., Frontiers in Marine Science, 9, ISSN:2296-7745
- Published
- 2022
24. Preferential export of permafrost-derived organic matter as retrogressive thaw slumping intensifies
- Author
-
Bröder, Lisa, Keskitalo, Kirsi, Zolkos, Scott, Shakil, Sarah, Tank, Suzanne E., Kokelj, Steve V., Tesi, Tommaso, Van Dongen, Bart E., Haghipour, Negar, Eglinton, Timothy I., Vonk, Jorien E., and Earth and Climate
- Subjects
climate change ,thermokarst ,carbon cycle ,cryosphere ,SDG 14 - Life Below Water - Abstract
Enhanced warming of the Northern high latitudes has intensified thermokarst processes throughout the permafrost zone. Retrogressive thaw slumps (RTS), where thaw-driven erosion caused by ground ice melt creates terrain disturbances extending over tens of hectares, represent particularly dynamic thermokarst features. Biogeochemical transformation of the mobilized substrate may release CO2 to the atmosphere and impact downstream ecosystems, yet its fate remains unclear. The Peel Plateau in northwestern Canada hosts some of the largest RTS features in the Arctic. Here, thick deposits of Pleistocene-aged glacial tills are overlain by a thinner layer of relatively organic-rich Holocene-aged permafrost that aggraded upward following deeper thaw and soil development during the early Holocene warm period. In this study, we characterize exposed soil layers and the mobilized material by analysing sediment properties and organic matter composition in active layer, Holocene and Pleistocene permafrost, recently thawed debris deposits and fresh deposits of slump outflow from four separate RTS features. We found that organic matter content, radiocarbon age and biomarker concentrations in debris and outflow deposits from all four sites were most similar to permafrost soils, with a lesser influence of the organic-rich active layer. Lipid biomarkers suggested a significant contribution of petrogenic carbon especially in Pleistocene permafrost. Active layer samples contained abundant intrinsically labile macromolecular components (polysaccharides, lignin markers, phenolic and N-containing compounds). All other samples were dominated by degraded organic constituents. Active layer soils, although heterogeneous, also had the highest median grain sizes, whereas debris and runoff deposits consisted of finer mineral grains and were generally more homogeneous, similar to permafrost. We thus infer that both organic matter degradation and hydrodynamic sorting during transport affect the mobilized material. Determining the relative magnitude of these two processes will be crucial to better assess the role of intensifying RTS activity in CO2 release and ecosystem carbon fluxes. ISSN:1748-9326 ISSN:1748-9318
- Published
- 2021
25. 27. Sources and sinks of Alpine glacier-derived carbon
- Author
-
Worek, Michelle Marie, Bröder, Lisa, Drake, Travis William, Haghipour, Negar, and Eglinton, Timothy Ian
- Subjects
ComputingMethodologies_GENERAL - Abstract
Poster presentation
- Published
- 2022
- Full Text
- View/download PDF
26. 72. Clay dissolution during early diagenesis? – Insights from neodymium isotopes
- Author
-
Rickli, Jörg, Tallon, Marie, Bamberg, Cédric, Suhrhoff, Tim J, Bruni, Elena, Bröder, Lisa, and Eglinton, Timothy Ian
- Subjects
ComputingMethodologies_GENERAL - Abstract
Poster presentation
- Published
- 2022
- Full Text
- View/download PDF
27. Contrasts in dissolved, particulate and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf
- Author
-
Jong, Dirk J., primary, Bröder, Lisa, additional, Tesi, Tommaso, additional, Keskitalo, Kirsi H., additional, Zimov, Nikita, additional, Davydova, Anna, additional, Pika, Philip, additional, Haghipour, Negar, additional, Eglinton, Timothy I., additional, and Vonk, Jorien E., additional
- Published
- 2022
- Full Text
- View/download PDF
28. Nunataryuk field campaigns: Understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region
- Author
-
Lizotte, Martine, primary, Juhls, Bennet, additional, Matsuoka, Atsushi, additional, Massicotte, Philippe, additional, Mével, Gaëlle, additional, Anikina, David Obie James, additional, Antonova, Sofia, additional, Bécu, Guislain, additional, Béguin, Marine, additional, Bélanger, Simon, additional, Bossé-Demers, Thomas, additional, Bröder, Lisa, additional, Bruyant, Flavienne, additional, Chaillou, Gwénaëlle, additional, Comte, Jérôme, additional, Couture, Raoul-Marie, additional, Devred, Emmanuel, additional, Deslongchamps, Gabrièle, additional, Dezutter, Thibaud, additional, Dillon, Miles, additional, Doxaran, David, additional, Flamand, Aude, additional, Fell, Frank, additional, Ferland, Joannie, additional, Forget, Marie-Hélène, additional, Fritz, Michael, additional, Gordon, Thomas J., additional, Guilmette, Caroline, additional, Hilborn, Andrea, additional, Hussherr, Rachel, additional, Irish, Charlotte, additional, Joux, Fabien, additional, Kipp, Lauren, additional, Laberge-Carignan, Audrey, additional, Lantuit, Hugues, additional, Leymarie, Edouard, additional, Mannino, Antonio, additional, Maury, Juliette, additional, Overduin, Paul, additional, Oziel, Laurent, additional, Stedmon, Colin, additional, Thomas, Crystal, additional, Tisserand, Lucas, additional, Tremblay, Jean-Éric, additional, Vonk, Jorien, additional, Whalen, Dustin, additional, and Babin, Marcel, additional
- Published
- 2022
- Full Text
- View/download PDF
29. The Permafrost Carbon in the Beaufort Sea (PeCaBeau) Expedition of the Research Vessel CCGS AMUNDSEN (AMD2104) in 2021
- Author
-
Bröder, Lisa, O'Regan, Matt, Fritz, Michael, Juhls, Bennet, Priest, Taylor, Lattaud, Julie, Whalen, Dustin, Matsuoka, Atsushi, Pellerin, André, Bossé-Demers, Thomas, Rudbäck, Daniel, Eulenburg, Antje, Carson, Thomas, Rodriguez-Cuicas, Maria-Emilia, Overduin, Paul, Vonk, Jorien E., Bröder, Lisa, O'Regan, Matt, Fritz, Michael, Juhls, Bennet, Priest, Taylor, Lattaud, Julie, Whalen, Dustin, Matsuoka, Atsushi, Pellerin, André, Bossé-Demers, Thomas, Rudbäck, Daniel, Eulenburg, Antje, Carson, Thomas, Rodriguez-Cuicas, Maria-Emilia, Overduin, Paul, and Vonk, Jorien E.
- Published
- 2022
30. Tracing Permafrost Carbon across the Beaufort Shelf - Satellites, water, microbes and mud
- Author
-
Vonk, Jorien E., Bröder, Lisa, Fritz, Michael, Vonk, Jorien E., Bröder, Lisa, and Fritz, Michael
- Abstract
The PeCaBeau (Permafrost Carbon on the Beaufort Shelf) project aims to track the movement and transformation of material from permafrost thaw along the land-to-ocean continuum. This multi-disciplinary effort investigates the sediment column between subsea permafrost and the seafloor, the water column, the atmosphere and the interfaces between these three units in the Beaufort Sea. By studying the sources, quantities and the quality of organic matter in the water column and in sediments, we aim to improve assessments of the Beaufort shelf as a carbon source or sink, and place these outcomes in the context of the Holocene paleo-environment and transgressed permafrost. Sampling operations took place in September 2021 on the Canadian Coast Guard Ship Amundsen funded by ARICE.
- Published
- 2022
31. Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams
- Author
-
Swiss Federal Institute of Technology (ETH) - Geological Institute, Department of Earth Sciences, UCL - SST/ELI/ELIE - Environmental Sciences, Bröder, Lisa, Hirst, Catherine, Opfergelt, Sophie, Thomas, Maxime, Vonk, J. E., Haghipour, N., Eglinton, T. I., Fouché, J., Swiss Federal Institute of Technology (ETH) - Geological Institute, Department of Earth Sciences, UCL - SST/ELI/ELIE - Environmental Sciences, Bröder, Lisa, Hirst, Catherine, Opfergelt, Sophie, Thomas, Maxime, Vonk, J. E., Haghipour, N., Eglinton, T. I., and Fouché, J.
- Abstract
On-going shrinkage of Greenland's icecap, permafrost thaw, and changes in precipitation are exposing its landscapes to erosion and remobilization of ancient organic carbon (OC) held in soils and sedimentary rocks. The fate of this OC and potential feedbacks to climate are still unclear. Here, we show that the glacial Zackenberg river (Northeastern Greenland) exports aged particulate OC (POC, uncalibrated radiocarbon ages of ∼4,000 years). Many of the smaller periglacial streams affected by abrupt permafrost thaw transport substantially older POC (up to 32,000 years), especially with enhanced discharge following intense precipitation. Mineralogical analysis, and density and size fractionation of soils and both glacial and nonglacial river sediments reveal that OC is largely associated with phyllosilicate minerals, suggesting stabilization against microbial processing. Enhanced export of ancient, mineral-associated OC as a consequence of summer rainfall may accelerate translocation of OC from terrestrial to marine environments, but could have limited consequences for climate.
- Published
- 2022
32. Understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region
- Author
-
Lizotte, M. P., Juhls, Bennet, Matsuoka, A., Massicotte, P., Mével, G., Anikina, D. O. J., Antonova, Sofia, Bécu, Guislain, Béguin, M., Bélanger, S., Bossé-Demers, Thomas, Bröder, Lisa, Bruyant, Flavienne, Chaillou, G, Comte, J., Couture, R.-M., Devred, E., Deslongchamps, G., Dezutter, T., Dillon, Melanie, Doxaran, D., Flamand, A., Fell, F., Ferland, J., Forget, M.-H., Fritz, Michael, Gordon, T.J., Guilmette, C., Hilborn, A., Hussherr, R., Irish, C., Joux, F., Kipp, L., Laberge-Carignan, A., Lantuit, Hugues, Leymarie, Edouard, Mannino, A., Maury, J., Overduin, Pier Paul, Oziel, Laurent, Stedmon, C., Thomas, C., Tisserand, L., Tremblay, J.-É., Vonk, J., Whalen, D., Babin, M., Lizotte, M. P., Juhls, Bennet, Matsuoka, A., Massicotte, P., Mével, G., Anikina, D. O. J., Antonova, Sofia, Bécu, Guislain, Béguin, M., Bélanger, S., Bossé-Demers, Thomas, Bröder, Lisa, Bruyant, Flavienne, Chaillou, G, Comte, J., Couture, R.-M., Devred, E., Deslongchamps, G., Dezutter, T., Dillon, Melanie, Doxaran, D., Flamand, A., Fell, F., Ferland, J., Forget, M.-H., Fritz, Michael, Gordon, T.J., Guilmette, C., Hilborn, A., Hussherr, R., Irish, C., Joux, F., Kipp, L., Laberge-Carignan, A., Lantuit, Hugues, Leymarie, Edouard, Mannino, A., Maury, J., Overduin, Pier Paul, Oziel, Laurent, Stedmon, C., Thomas, C., Tisserand, L., Tremblay, J.-É., Vonk, J., Whalen, D., and Babin, M.
- Published
- 2022
33. Tracing the footprint of permafrost carbon supply to the Canadian Beaufort Sea
- Author
-
Bröder, Lisa, primary, Lattaud, Julie, additional, Juhls, Bennet, additional, Eulenburg, Antje, additional, Priest, Taylor, additional, Fritz, Michael, additional, Matsuoka, Atsushi, additional, Pellerin, André, additional, Bossé-Demers, Thomas, additional, Rudbäck, Daniel, additional, O'Regan, Matt, additional, Whalen, Dustin, additional, Haghipour, Negar, additional, Eglinton, Timothy, additional, Overduin, Paul, additional, and Vonk, Jorien, additional
- Published
- 2022
- Full Text
- View/download PDF
34. Particulate organic carbon composition and landscape characteristics in the Peel River Watershed, Canada
- Author
-
Keskitalo, Kirsi, primary, Speetjens, Niek, additional, Overduin, Paul, additional, Westermann, Sebastian, additional, Miesner, Frederieke, additional, Sachs, Torsten, additional, Nitze, Ingmar, additional, Bröder, Lisa, additional, Haghipour, Negar, additional, Eglinton, Timothy, additional, and Vonk, Jorien, additional
- Published
- 2022
- Full Text
- View/download PDF
35. Radiocarbon and Stable Isotope Constraints on the Sources and Cycling of Organic Carbon in Mackenzie Delta Lakes
- Author
-
Lattaud, Julie, primary, Bröder, Lisa, additional, Haghipour, Negar, additional, Giosan, Liviu, additional, and Eglinton, Timothy, additional
- Published
- 2022
- Full Text
- View/download PDF
36. Seasonal variability in particulate organic carbon degradation in the Kolyma River, Siberia
- Author
-
Keskitalo, Kirsi H, primary, Bröder, Lisa, additional, Jong, Dirk, additional, Zimov, Nikita, additional, Davydova, Anna, additional, Davydov, Sergei, additional, Tesi, Tommaso, additional, Mann, Paul J, additional, Haghipour, Negar, additional, Eglinton, Timothy I, additional, and Vonk, Jorien E, additional
- Published
- 2022
- Full Text
- View/download PDF
37. A new Online Ramped Oxidation (ORO) system for improved coupled thermal and radiocarbon dissection of complex natural organic matter
- Author
-
Bolandini, Marco, Bröder, Lisa, De Maria, Daniele, Wacker, Lukas, and Eglinton, Timothy I.
- Published
- 2022
- Full Text
- View/download PDF
38. Molecular-Multiproxy Assessment of Land-Derived Organic Matter Degradation Over Extensive Scales of the East Siberian Arctic Shelf Seas
- Author
-
Matsubara, Felipe, Wild, Birgit, Martens, Jannik, Andersson, August, Wennström, R., Bröder, Lisa, Dudarev, Oleg V., Semiletov, Igor, and Gustafsson, Örjan
- Abstract
Global warming triggers permafrost thaw, which increases the release of terrigenous organic matter (terr-OM) to the Arctic Ocean by coastal erosion and rivers. Terrigenous OM degradation in the Arctic Ocean contributes to greenhouse gas emissions and severe ocean acidification, yet the vulnerability of different terr-OM components is poorly resolved. Here, terr-OM degradation dynamics are studied with unprecedented spatial coverage over the World's largest shelf sea system—the East Siberian Arctic Shelf (ESAS), using a multi-proxy molecular biomarker approach. Mineral-surface-area-normalized concentrations of terr-OM compounds in surface sediments decreases offshore. Differences between terr-OM compound classes (lignin phenols, high-molecular weight [HMW] n-alkanes, n-alkanoic acids and n-alkanols, sterols, 3,5-dihydroxybenzoic acids, cutin acids) reflect contrasting influence of sources, propensity to microbial degradation and association with sedimenting particles, with lignin phenols disappearing 3-times faster than total terr-OM, and twice faster than other biomarkers. Molecular degradation proxies support substantial terr-OM degradation across the ESAS, with clearest trends shown by: 3,5-dihydroxybenzoic acid/vanillyl phenol ratios, acid-to-aldehyde ratios of syringyl and vanillyl phenols, Carbon Preference Indices of HMW n-alkyl compounds and sitostanol/β-sitosterol. The combination of terr-OM biomarker data with δ13C/Δ14C-based source apportionment indicates that the more degraded state of lignin is influenced by the relative contribution of river-transported terr-OM from surface soils, while HMW n-alkanoic acids and stigmasterol are influenced by erosion-derived terr-OM from Ice Complex deposits. Our findings demonstrate differences in vulnerability to degradation between contrasting terr-OM pools, and underscore the need to consider molecular properties for understanding and modeling of large-scale biogeochemical processes of the permafrost carbon-climate feedback., Global Biogeochemical Cycles, 36 (12), ISSN:0886-6236, ISSN:1944-9224
- Published
- 2022
- Full Text
- View/download PDF
39. Clay dissolution during early diagenesis? – Insights from neodymium isotopes
- Author
-
Rickli, Jörg, Tallon, Marie, Bamberg, Cedric, Suhrhoff, Tim Jesper, Bruni, Elena, Bröder, Lisa, and Eglinton, Timothy I.
- Published
- 2022
- Full Text
- View/download PDF
40. Constraining the origin and evolution of organic carbon-mineral interactions within a fluvial system
- Author
-
Gallarotti, Nora, primary, Bröder, Lisa, additional, Peucker-Ehrenbrink, Bernhard, additional, Voss, Britta, additional, Haghipour, Negar, additional, and Eglinton, Timothy, additional
- Published
- 2022
- Full Text
- View/download PDF
41. The SPLASH Action Group – Towards standardized sampling strategies along the soil-to-hydrosystems continuum in permafrost landscapes
- Author
-
Fouche, Julien, Shakil, Sarah, Hirst, Catherine, Bröder, Lisa, Agnan, Yannick, Sjöberg, Ylva, Bouchard, Frédéric, EGU General Assembly 2021, and UCL - SST/ELI/ELIE - Environmental Sciences
- Abstract
The Action Group called ‘Standardized methods across Permafrost Landscapes: from Arctic Soils to Hydrosystems’ (SPLASH), funded by the International Permafrost Association, is a community-driven effort aiming to provide a suite of standardized field strategies for sampling mineral and organic components in soils, sediments, surface water bodies and coastal environments across permafrost landscapes. This unified approach will allow data to be shared and compared, thus improving our understanding of the processes occurring during lateral transport in circumpolar Arctic watersheds. This is an international and transdisciplinary effort aiming to provide a fieldwork “tool box” of the most relevant sampling schemes and sample conservation procedures for mineral and organic permafrost pools. With climate change, permafrost soils are undergoing drastic transformations. Both localized abrupt thaw (thermokarst) and gradual ecosystem shifts (e.g., active layer thickening, vegetation changes) drive changes in hydrology and biogeochemical cycles (carbon, nutrients, and contaminants). Mineral and organic components interact along the “lateral continuum” (i.e., from soils to aquatic systems) changing their composition and reactivity across the different interfaces. The circumpolar Arctic region is characterized by high spatial heterogeneity (e.g., geology, topography, vegetation, and ground-ice content) and large inter-annual and seasonal variations in local climate and biophysical processes. Common sampling strategies, applied in different seasons and locations, could help to tackle the spatial and temporal complexity inextricably linked to biogeochemical processes. This unified approach developed in permafrost landscapes will allow us to overcome the following challenges: (1) identifying interfaces where detectable changes in mineral and organic components occur; (2) allowing spatial comparison of these detectable changes; and (3) capturing temporal (inter-/intra-annual) variations at these interfaces. In order to build on the great effort to better assess the permafrost feedback to climate change, there is an urgent need for a set of community-based protocols to capture changes the dynamics of organics and minerals during their lateral transport. Here, we present the first results from an online survey recently conducted among researchers from different disciplines. The survey inputs provide valuable information about the common approaches currently applied along the “soil-to-hydrosystems” continuum and the specific challenges associated with permafrost studies. These results about the ‘WHAT, WHERE, WHEN, and HOW’ of field sampling (e.g., sample collection, filtration, conservation...) allow for identifying the most relevant sampling strategies and also the current knowledge gaps. Finally, we present examples of the protocols available to investigate organic and mineral components from soils to marine environments, on which a synoptic sampling strategy can be built. All forthcoming contributions from our community are still welcome, helping the SPLASH team to fill up the most adapted tool box to Arctic permafrost landscapes. How to cite: Fouche, J., Shakil, S., Hirst, C., Bröder, L., Agnan, Y., Sjöberg, Y., and Bouchard, F.: The SPLASH Action Group – Towards standardized sampling strategies along the soil-to-hydrosystems continuum in permafrost landscapes, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11184, https://doi.org/10.5194/egusphere-egu21-11184, 2021.
- Published
- 2021
42. Mobilization of particulate organic matter and minerals in Zackenberg valley, Greenland
- Author
-
Fouche, Julien, Shakil, Sarah, Hirst, Catherine, Bröder, Lisa, Agnan, Yannick, Sjöberg, Ylva, Bouchard, Frédéric, EGU General Assembly 2021, and UCL - SST/ELI/ELIE - Environmental Sciences
- Abstract
The Action Group called ‘Standardized methods across Permafrost Landscapes: from Arctic Soils to Hydrosystems’ (SPLASH), funded by the International Permafrost Association, is a communitydriven effort aiming to provide a suite of standardized field strategies for sampling mineral and organic components in soils, sediments, surface water bodies and coastal environments across permafrost landscapes. This unified approach will allow data to be shared and compared, thus improving our understanding of the processes occurring during lateral transport in circumpolar Arctic watersheds. This is an international and transdisciplinary effort aiming to provide a fieldwork “tool box” of the most relevant sampling schemes and sample conservation procedures for mineral and organic permafrost pools. With climate change, permafrost soils are undergoing drastic transformations. Both localized abrupt thaw (thermokarst) and gradual ecosystem shifts (e.g., active layer thickening, vegetation changes) drive changes in hydrology and biogeochemical cycles (carbon, nutrients, and contaminants). Mineral and organic components interact along the “lateral continuum” (i.e., from soils to aquatic systems) changing their composition and reactivity across the different interfaces. The circumpolar Arctic region is characterized by high spatial heterogeneity (e.g., geology, topography, vegetation, and ground-ice content) and large inter-annual and seasonal variations in local climate and biophysical processes. Common sampling strategies, applied in different seasons and locations, could help to tackle the spatial and temporal complexity inextricably linked to biogeochemical processes. This unified approach developed in permafrost landscapes will allow us to overcome the following challenges: (1) identifying interfaces where detectable changes in mineral and organic components occur; (2) allowing spatial comparison of these detectable changes; and (3) capturing temporal (inter-/intra-annual) variations at these interfaces. In order to build on the great effort to better assess the permafrost feedback to climate change, there is an urgent need for a set of community-based protocols to capture changes the dynamics of organics and minerals during their lateral transport. Here, we present the first results from an online survey recently conducted among researchers from different disciplines. The survey inputs provide valuable information about the common approaches currently applied along the “soil-to-hydrosystems” continuum and the specific challenges associated with permafrost studies. These results about the ‘WHAT, WHERE, WHEN, and HOW’ of field sampling (e.g., sample collection, filtration, conservation...) allow for identifying the most relevant sampling strategies and also the current knowledge gaps. Finally, we present examples of the protocols available to investigate organic and mineral components from soils to marine environments, on which a synoptic sampling strategy can be built. All forthcoming contributions from our community are still welcome, helping the SPLASH team to fill up the most adapted tool box to Arctic permafrost landscapes.
- Published
- 2021
43. Mobilization of particulate organic matter and minerals in Zackenberg valley, Greenland
- Author
-
UCL - SST/ELI/ELIE - Environmental Sciences, Fouche, Julien, Shakil, Sarah, Hirst, Catherine, Bröder, Lisa, Agnan, Yannick, Sjöberg, Ylva, Bouchard, Frédéric, EGU General Assembly 2021, UCL - SST/ELI/ELIE - Environmental Sciences, Fouche, Julien, Shakil, Sarah, Hirst, Catherine, Bröder, Lisa, Agnan, Yannick, Sjöberg, Ylva, Bouchard, Frédéric, and EGU General Assembly 2021
- Abstract
The Action Group called ‘Standardized methods across Permafrost Landscapes: from Arctic Soils to Hydrosystems’ (SPLASH), funded by the International Permafrost Association, is a communitydriven effort aiming to provide a suite of standardized field strategies for sampling mineral and organic components in soils, sediments, surface water bodies and coastal environments across permafrost landscapes. This unified approach will allow data to be shared and compared, thus improving our understanding of the processes occurring during lateral transport in circumpolar Arctic watersheds. This is an international and transdisciplinary effort aiming to provide a fieldwork “tool box” of the most relevant sampling schemes and sample conservation procedures for mineral and organic permafrost pools. With climate change, permafrost soils are undergoing drastic transformations. Both localized abrupt thaw (thermokarst) and gradual ecosystem shifts (e.g., active layer thickening, vegetation changes) drive changes in hydrology and biogeochemical cycles (carbon, nutrients, and contaminants). Mineral and organic components interact along the “lateral continuum” (i.e., from soils to aquatic systems) changing their composition and reactivity across the different interfaces. The circumpolar Arctic region is characterized by high spatial heterogeneity (e.g., geology, topography, vegetation, and ground-ice content) and large inter-annual and seasonal variations in local climate and biophysical processes. Common sampling strategies, applied in different seasons and locations, could help to tackle the spatial and temporal complexity inextricably linked to biogeochemical processes. This unified approach developed in permafrost landscapes will allow us to overcome the following challenges: (1) identifying interfaces where detectable changes in mineral and organic components occur; (2) allowing spatial comparison of these detectable changes; and (3) capturing temporal (inter-/intra-annual) variatio
- Published
- 2021
44. Influence of hydraulic connectivity on carbon burial efficiency in Mackenzie Delta lake sediments
- Author
-
Lattaud, Julie, Bröder, Lisa, Haghipour, Negar, Rickli, Joerg, Giosan, Liviu, Eglinton, Timothy I., Lattaud, Julie, Bröder, Lisa, Haghipour, Negar, Rickli, Joerg, Giosan, Liviu, and Eglinton, Timothy I.
- Abstract
The Arctic is undergoing accelerated changes in response to ongoing modifications to the climate system, and there is a need for local to regional scale records of past climate variability in order to put these changes into context. The Mackenzie Delta region in northern Canada is populated by numerous small shallow lakes. They are classified as no-, low-, and high-closure (NC, LC, and HC, respectively) lakes, reflecting varying degrees of connection to the river main stem, and have different sedimentation characteristics. This study examines sedimentological (mineral surface area, grain size), carbon isotopic (bulk and molecular-level) and inorganic isotopic (neodymium) characteristics of sediment cores from three lakes representing each class. We find that HC lake sediments exhibit strikingly different properties from the other lake sediments. Specifically, they are characterized by higher organic carbon loadings per unit mineral surface area and with relatively minor influence from allochthonous, petrogenic (rock-derived) organic carbon. In contrast, LC and NC lakes have the potential to record basin-scale climatic changes at a high resolution by virtue of enhanced detrital sedimentation. Overall the delta lakes have the capacity to bury about 2 MtC year−1, with little changes in the last 200 years. However, in the (near) future, an increased number of high closure lakes might change the carbon burial efficiency of the Mackenzie Delta as they seem to retain less carbon than NC and LC lakes.
- Published
- 2021
45. Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic
- Author
-
Tanski, George, Bröder, Lisa, Wagner, Dirk, Knoblauch, Christian, Lantuit, Hugues, Beer, Christian, Sachs, Torsten, Fritz, Michael, Tesi, Tommaso, Koch, Boris, Haghipour, Negar, Eglinton, T. I., Strauss, Jens, Vonk, Jorien E., Tanski, George, Bröder, Lisa, Wagner, Dirk, Knoblauch, Christian, Lantuit, Hugues, Beer, Christian, Sachs, Torsten, Fritz, Michael, Tesi, Tommaso, Koch, Boris, Haghipour, Negar, Eglinton, T. I., Strauss, Jens, and Vonk, Jorien E.
- Abstract
Warming air and sea temperatures, longer open-water seasons and sea-level rise promote the erosion of permafrost coasts in the Arctic, which profoundly impacts organic matter pathways. Although estimates on organic carbon (OC) fluxes from erosion exist for some parts of the Arctic, little is known about how much OC is transformed into greenhouse gases (GHGs). In this study we investigated two different coastal erosion scenarios on Qikiqtaruk – Herschel Island (Canada) and estimate the potential for GHG formation. We distinguished between a delayed release represented by mud debris draining a coastal thermoerosional feature and a direct release represented by cliff debris at a low collapsing bluff. Carbon dioxide (CO2) production was measured during incubations at 4 °C under aerobic conditions for two months and were modelled for four months and a full year. Our incubation results show that mud debris and cliff debris lost a considerable amount of OC as CO2 (2.5 ± 0.2 and 1.6 ± 0.3% of OC, respectively). Although relative OC losses were highest in mineral mud debris, higher initial OC content and fresh organic matter in cliff debris resulted in a ~three times higher cumulative CO2 release (4.0 ± 0.9 compared to 1.4 ± 0.1 mg CO2 gdw-1), which was further increased by the addition of seawater. After four months, modelled OC losses were 4.9 ± 0.1 and 3.2 ± 0.3% in set-ups without seawater and 14.3 ± 0.1 and 7.3 ± 0.8% in set-ups with seawater. The results indicate that a delayed release may support substantial cycling of OC at relatively low CO2 production rates during long transit times onshore during the Arctic warm season. By contrast, direct erosion may result in a single CO2 pulse and less substantial OC cycling onshore as transfer times are short. Once eroded sediments are deposited in the nearshore, highest OC losses can be expected. We conclude that the release of CO2 from eroding permafrost coasts varies considerably between erosion types and residence time ons
- Published
- 2021
46. The SPLASH Action Group – Towards standardized sampling strategies along the soil-to-hydrosystems continuum in permafrost landscapes
- Author
-
UCL - SST/ELI/ELIE - Environmental Sciences, Fouche, Julien, Shakil, Sarah, Hirst, Catherine, Bröder, Lisa, Agnan, Yannick, Sjöberg, Ylva, Bouchard, Frédéric, EGU General Assembly 2021, UCL - SST/ELI/ELIE - Environmental Sciences, Fouche, Julien, Shakil, Sarah, Hirst, Catherine, Bröder, Lisa, Agnan, Yannick, Sjöberg, Ylva, Bouchard, Frédéric, and EGU General Assembly 2021
- Abstract
The Action Group called ‘Standardized methods across Permafrost Landscapes: from Arctic Soils to Hydrosystems’ (SPLASH), funded by the International Permafrost Association, is a community-driven effort aiming to provide a suite of standardized field strategies for sampling mineral and organic components in soils, sediments, surface water bodies and coastal environments across permafrost landscapes. This unified approach will allow data to be shared and compared, thus improving our understanding of the processes occurring during lateral transport in circumpolar Arctic watersheds. This is an international and transdisciplinary effort aiming to provide a fieldwork “tool box” of the most relevant sampling schemes and sample conservation procedures for mineral and organic permafrost pools. With climate change, permafrost soils are undergoing drastic transformations. Both localized abrupt thaw (thermokarst) and gradual ecosystem shifts (e.g., active layer thickening, vegetation changes) drive changes in hydrology and biogeochemical cycles (carbon, nutrients, and contaminants). Mineral and organic components interact along the “lateral continuum” (i.e., from soils to aquatic systems) changing their composition and reactivity across the different interfaces. The circumpolar Arctic region is characterized by high spatial heterogeneity (e.g., geology, topography, vegetation, and ground-ice content) and large inter-annual and seasonal variations in local climate and biophysical processes. Common sampling strategies, applied in different seasons and locations, could help to tackle the spatial and temporal complexity inextricably linked to biogeochemical processes. This unified approach developed in permafrost landscapes will allow us to overcome the following challenges: (1) identifying interfaces where detectable changes in mineral and organic components occur; (2) allowing spatial comparison of these detectable changes; and (3) capturing temporal (inter-/intra-annual) variati
- Published
- 2021
47. Contrasts in dissolved, particulate and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf.
- Author
-
Jong, Dirk J., Bröder, Lisa, Tesi, Tommaso, Keskitalo, Kirsi H., Zimov, Nikita, Davydova, Anna, Pika, Philip, Haghipour, Negar, Eglinton, Timothy I., and Vonk, Jorien E.
- Subjects
GREENHOUSE gases ,PERMAFROST ,THAWING ,GLOBAL warming ,WATERSHEDS - Abstract
Arctic rivers will be increasingly affected by the hydrological and biogeochemical consequences of thawing permafrost. During transport, permafrost-derived organic carbon (OC) can either accumulate in floodplain and shelf sediments or be degraded into greenhouse gases prior to final burial. Thus, the net impact of permafrost OC on climate will ultimately depend on the interplay of complex processes that occur along the source-to-sink system. Here, we focused on the Kolyma River, the largest watershed completely underlain by continuous permafrost, and marine sediments of the East Siberian Sea as a transect to investigate the fate of permafrost OC along the land-ocean continuum. Three pools of riverine OC were investigated for the Kolyma main stem and five of its tributaries: dissolved OC (DOC), suspended particulate OC (POC), and riverbed sediment OC (SOC) and compared to earlier findings in marine sediments. Carbon isotopes (δ
13 C, Δ14 C), lignin phenol, and lipid biomarkers show a contrasting composition and degradation state of these different carbon pools. Dual isotope source apportionment calculations imply that old permafrost-OC is mostly associated with sediments (SOC; contribution of 68 ± 10 %), and less dominant in POC (38 ± 8 %), while autochthonous primary production contributes around 44 ± 10 % to POC in the main stem and up to 79 ± 11 % in tributaries. Biomarker degradation indices suggest that Kolyma DOC is relatively degraded, regardless of its generally young age shown by previous studies. In contrast, SOC shows the lowest Δ14 C signal (oldest OC), yet relatively fresh compositional signatures. Furthermore, decreasing mineral surface area-normalised OC- and biomarker loadings suggest that SOC is reactive along the land-ocean continuum supporting the idea that floodplain and shelf sediments are efficient reactors. A better understanding of DOC and POC dynamics in Arctic rivers is still necessary, however, this study highlights that sedimentary dynamics play a crucial role when targeting permafrost-derived OC in aquatic systems. Chemical and physical processes (e.g. degradation, sorption) along fluvial-marine transects will determine to what degree thawed permafrost OC may be destined for long-term burial, therewith attenuating further global warming. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
48. Contrasts in dissolved, particulate and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf.
- Author
-
Jong, Dirk, Bröder, Lisa, Tesi, Tommaso, Keskitalo, Kirsi, Zimov, Nikita, Davydova, Anna, Pika, Philip, Haghipour, Negar, Eglinton, Timothy, and Vonk, Jorien
- Subjects
CARBON compounds ,MARINE sediments ,CHEMICAL processes ,CARBON isotopes ,GLOBAL warming ,PERMAFROST ,RIVER channels ,SEA ice - Abstract
Arctic rivers will be increasingly affected by the hydrological and biogeochemical consequences of thawing permafrost. During transport, permafrost-derived organic carbon (OC) can either accumulate in floodplain and shelf sediments or be degraded into greenhouse gases prior to final burial. Thus, the net impact of permafrost OC on climate will ultimately depend on the interplay of complex processes that occur along the source-to-sink system. Here, we focused on the Kolyma River, the largest watershed completely underlain by continuous permafrost, and marine sediments of the East Siberian Sea as transect to investigate the fate of permafrost OC along the land-ocean continuum. Three pools of riverine OC were investigated for the Kolyma main stem and five of its tributaries: dissolved OC (DOC), suspended particulate OC (POC), and riverbed sediment OC (SOC) and compared to earlier findings in marine sediments. Carbon isotopes (d13C, 14C), lignin phenol, and lipid biomarkers show a contrasting composition and degradation state of these different carbon pools. Dual isotope source apportionment calculations imply that old permafrost-OC is mostly associated with sediments (SOC; contribution of 68 ± 10%), and less dominant in POC (38 ± 8%), while autochthonous primary production contributes around 44 ± 10% to POC in the main stem and up to 79 ± 11% in tributaries. Biomarker degradation indices suggest that Kolyma DOC is relatively degraded, regardless of its generally young age shown by previous studies. In contrast, SOC shows the lowest 14C signal (oldest OC), yet relatively fresh compositional signatures. Furthermore, decreasing mineral surface areanormalised OC- and biomarker loadings suggest that SOC is reactive along the land-ocean continuum supporting the idea that floodplain and shelf sediments are efficient reactors. A better understanding of DOC and POC dynamics in Arctic rivers is still necessary, however, this study highlights that sedimentary dynamics play a crucial role when targeting permafrost-derived OC in aquatic systems. Chemical and physical processes (e.g. degradation, sorption) along fluvial-marine transects will determine to what degree thawed permafrost OC may be destined for long-term burial, therewith attenuating further global warming. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
49. Nunataryuk field campaigns: Understanding the origin and fate of terrestrial organic matter in the coastal waters of the Mackenzie Delta region.
- Author
-
Lizotte, Martine, Juhls, Bennet, Atsushi Matsuoka, Massicotte, Philippe, Mével, Gaëlle, Anikina, David Obie James, Antonova, Sofia, Bécu, Guislain, Béguin, Marine, Bélanger, Simon, Bossé-Demers, Thomas, Bröder, Lisa, Bruyant, Flavienne, Chaillou, Gwénaëlle, Comte, Jérôme, Couture, Raoul-Marie, Devred, Emmanuel, Deslongchamps, Gabrièle, Dezutter, Thibaud, and Dillon, Miles
- Subjects
CARBON content of water ,PERMAFROST ,COLLOIDAL carbon ,DISSOLVED organic matter ,WATERSHEDS ,TERRITORIAL waters ,TUNDRAS ,SOIL sampling - Abstract
Climate warming and related drivers of soil thermal change in the Arctic are expected to modify the distribution and dynamics of carbon contained in perennially frozen grounds. Thawing of permafrost in the Mackenzie Delta region of northwestern Canada, coupled with increases in river discharge and coastal erosion, trigger the release of terrestrial organic matter (OMt) from the largest Arctic drainage basin in North America into the Arctic Ocean. While this process is ongoing, well-established, and its rate is accelerating, the fate of the newly-mobilized organic matter, as it transits from the watershed through the delta and into the marine system, remains poorly understood. In the framework of the European Horizon 2020 Nunataryuk programme, and as part of theWork Package 4 (WP4) CoastalWaters theme, four field expeditions were conducted in the Mackenzie Delta region and southern Beaufort Sea from April to September 2019. The temporal sampling design allowed the survey of ambient conditions in the coastal waters under full ice cover prior to the spring freshet, during ice break-up in summer, as well as anterior to the freeze-up period in fall. To capture the fluvial-marine transition zone, and with distinct challenges related to shallow waters and changing seasonal and meteorological conditions, the field sampling was conducted in close partnership with members of the communities of Aklavik, Inuvik and Tuktoyaktuk, using several platforms: helicopters, snowmobiles and small boats. Water column profiles of physical and optical variables were measured in situ, while surface water, groundwater and sediment samples were collected and preserved for the determination of the composition and sources of OMt, including particulate and dissolved organic carbon (POC, DOC), and chromophoric dissolved organic matter (CDOM), as well as a suite of physical, chemical and biological variables. Here we present an overview of the standardized datasets, including hydrographic profiles, remote sensing reflectance, temperature and salinity, particle absorption, nutrients, dissolved organic carbon, particulate organic carbon, particulate organic nitrogen, colored dissolved organic matter absorption, fluorescent dissolved organic matter intensity, suspended particulate matter, total particulate carbon, total particulate nitrogen, stable water isotopes, radon in water, bacterial abundance, and a string of phytoplankton pigments including total chlorophyll. Datasets and related metadata can be found in Juhls et al. 2021. https://doi.pangaea.de/10.1594/PANGAEA.937587. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
50. Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps
- Author
-
Keskitalo, Kirsi H., primary, Bröder, Lisa, additional, Shakil, Sarah, additional, Zolkos, Scott, additional, Tank, Suzanne E., additional, van Dongen, Bart E., additional, Tesi, Tommaso, additional, Haghipour, Negar, additional, Eglinton, Timothy I., additional, Kokelj, Steven V., additional, and Vonk, Jorien E., additional
- Published
- 2021
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.