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4. Lagged Wetland CH4 Flux Response in a Historically Wet Year.

Author

Turner, J., Desai, A. R., Thom, J., and Wickland, K. P.

Subjects
WETLANDS, CARBON emissions, FARM manure in methane production, PLANT canopies, PRECIPITATION (Chemistry), WATER temperature
Abstract

While a stimulating effect of plant primary productivity on soil carbon dioxide (CO2) emissions has been well documented, links between gross primary productivity (GPP) and wetland methane (CH4) emissions are less well investigated. Determination of the influence of primary productivity on wetland CH4 emissions (FCH4) is complicated by confounding influences of water table level and temperature on CH4 production, which also vary seasonally. Here, we evaluate the link between preceding GPP and subsequent FCH4 at two fens in Wisconsin using eddy covariance flux towers, Lost Creek (US-Los) and Allequash Creek (US-ALQ). Both wetlands are mosaics of forested and shrub wetlands, with US-Los being larger in scale and having a more open canopy. Co-located sites with multiyear observations of flux, hydrology, and meteorology provide an opportunity to measure and compare lag effects on FCH4 without interference due to differing climate. Daily average FCH4 from US-Los reached a maximum of 47.7 ηmol CH4 m−2 s−1 during the study period, while US-ALQ was more than double at 117.9 ηmol CH4 m−2 s−1. The lagged influence of GPP on temperature-normalized FCH4 (Tair-FCH4) was weaker and more delayed in a year with anomalously high precipitation than a following drier year at both sites. FCH4 at US-ALQ was lower coincident with higher stream discharge in the wet year (2019), potentially due to soil gas flushing during high precipitation events and lower water temperatures. Better understanding of the lagged influence of GPP on FCH4 due to this study has implications for climate modeling and more accurate carbon budgeting. [ABSTRACT FROM AUTHOR]

Published
2021
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6. Biomass offsets little or none of permafrost carbon release from soils, streams, and wild␣re: an expert assessment

Author

Abbott, B. W., Jones, J. B., Schuur, E. A. G., Chapin, F. S., Bowden, W. B., Bret-Harte, M. S., Epstein, H. E., Flannigan, M. D., Harms, T. K., Hollingsworth, T. N., Mack, M. C., Mcguire, A. D., Natali, S. M., Rocha, A. V., Tank, S. E., Turetsky, M. R., Vonk, J. E., Wickland, K. P., Aiken, G. R., Alexander, H. D., Amon, R. M. W., Benscoter, B. W., Bergeron, Y., Bishop, K., Blarquez, O., Bond-Lamberty, B., Breen, A. L., Buffam, I., Cai, Y. H., Christopher Carcaillet, Carey, S. K., Chen, J. M., Chen, H. Y. H., Christensen, T. R., Cooper, L. W., Cornelissen, J. H. C., Groot, W. J., Deluca, T. H., Dorrepaal, E., Fetcher, N., Finlay, J. C., Forbes, B. C., French, N. H. F., Gauthier, S., Girardin, M. P., Goetz, S. J., Goldammer, J. G., Gough, L., Grogan, P., Guo, L. D., Higuera, P. E., Hinzman, L., Hu, F. S., Hugelius, G., Jafarov, E. E., Jandt, R., Johnstone, J. F., Karlsson, J., Kasischke, E. S., Kattner, G., Kelly, R., Keuper, F., Kling, G. W., Kortelainen, P., Kouki, J., Kuhry, P., Laudon, H., Laurion, I., Macdonald, R. W., Mann, P. J., Martikainen, P. J., Mcclelland, J. W., Molau, U., Oberbauer, S. F., Olefeldt, D., Pare, D., Parisien, M. A., Payette, S., Peng, C. H., Pokrovsky, O. S., Rastetter, E. B., Raymond, P. A., Raynolds, M. K., Rein, G., Reynolds, J. F., Robards, M., Rogers, B. M., Schadel, C., Schaefer, K., Schmidt, I. K., Shvidenko, A., Sky, J., Spencer, R. G. M., Starr, G., Striegl, R. G., Teisserenc, R., Tranvik, L. J., Virtanen, T., Welker, J. M., Zimov, S., Institute of Arctic Biology and Department of Biology & Wildlife, University of Alaska [Fairbanks] (UAF), Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA), Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE), McMaster University [Hamilton, Ontario], 955713, National Science Foundation, OPP-0806394, Office of Polar Programs, Future Forest (Mistra), SITES (Swedish Science Foundation), TOMCAR-Permafrost #277059, Marie Curie International Reintegration, Institute of Arctic Biology, Université de Rennes (UR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Earth and Climate, Systems Ecology, Amsterdam Global Change Institute, Environmental Sciences, Tarmo Virtanen / Principal Investigator, and Environmental Change Research Unit (ECRU)

Subjects
0106 biological sciences, 010504 meteorology & atmospheric sciences, Biomass, F800, SEQUESTRATION, Permafrost, 01 natural sciences, FIRE, wildfire, Klimatforskning, Arctic, вечная мерзлота, Dissolved organic carbon, ECOSYSTEMS, SDG 13 - Climate Action, boreal, General Environmental Science, Total organic carbon, ARCTIC TUNDRA, CLIMATE-CHANGE, Carbon, Climate change, Miljövetenskap, Permafrost carbon cycle, Earth and Related Environmental Sciences, STORAGE, углеродный баланс, particulate organic carbon, Climate Research, permafrost carbon, Soil science, 010603 evolutionary biology, BOREAL FOREST, биомасса, Ecosystem, SDG 14 - Life Below Water, 1172 Environmental sciences, 0105 earth and related environmental sciences, INTERIOR ALASKA, coastal erosion, Hydrology, VULNERABILITY, NITROGEN DEPOSITION, Renewable Energy, Sustainability and the Environment, coastal erosion Supplementary material for this article is available, Public Health, Environmental and Occupational Health, Geovetenskap och miljövetenskap, 15. Life on land, dissolved organic carbon, Tundra, 13. Climate action, Soil water, Environmental science, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Environmental Sciences
Abstract

CT3 ; EnjS4; International audience; As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of the critical factors driving carbon balance are unlikely in the near future, so to address this gap, we present estimates from 98 permafrost-region experts of the response of biomass, wild␣re, and hydrologic carbon ␣ux to climate change. Results suggest that contrary to model projections, total permafrost-region biomass could decrease due to water stress and disturbance, factors that are not adequately incorporated in current models. Assessments indicate that end-of-the-century organic carbon release from Arctic rivers and collapsing coastlines could increase by 75% while carbon loss via burning could increase four-fold. Experts identi␣ed water balance, shifts in vegetation community, and permafrost degradation as the key sources of uncertainty in predicting future system response. In combination with previous ␣ndings, results suggest the permafrost region will become a carbon source to the atmosphere by 2100 regardless of warming scenario but that 65%–85% of permafrost carbon release can still be avoided if human emissions are actively reduced.

Published
2016
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7. Reviews and syntheses: Effects of permafrost thaw on Arctic aquatic ecosystems

Author

Vonk, J. E., primary, Tank, S. E., additional, Bowden, W. B., additional, Laurion, I., additional, Vincent, W. F., additional, Alekseychik, P., additional, Amyot, M., additional, Billet, M. F., additional, Canário, J., additional, Cory, R. M., additional, Deshpande, B. N., additional, Helbig, M., additional, Jammet, M., additional, Karlsson, J., additional, Larouche, J., additional, MacMillan, G., additional, Rautio, M., additional, Walter Anthony, K. M., additional, and Wickland, K. P., additional

Published
2015
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11. Biodegradability of dissolved organic carbon in permafrost soils and waterways: a meta-analysis.

Author

Vonk, J. E., Tank, S. E., Mann, P. J., Spencer, R. G. M., Treat, C. C., Striegl, R. G., Abbott, B. W., and Wickland, K. P.

Subjects
SOIL moisture, WATERWAYS, BIODEGRADATION, CLIMATE change, BIODEGRADABLE materials
Abstract

As Arctic regions warm, the large organic carbon pool stored in permafrost becomes increasingly vulnerable to thaw and decomposition. The transfer of newly mobilized carbon to the atmosphere and its potential influence upon climate change will largely depend on the reactivity and subsequent fate of carbon delivered to aquatic ecosystems. Dissolved organic carbon (DOC) is a key regulator of aquatic metabolism and its biodegradability will determine the extent and rate of carbon release from aquatic ecosystems to the atmosphere. Knowledge of the mechanistic controls on DOC biodegradability is however currently poor due to a scarcity of long-term data sets, limited spatial coverage of available data, and methodological diversity. Here, we performed parallel biodegradable DOC (BDOC) experiments at six Arctic sites (16 experiments) using a standardized incubation protocol to examine the effect of methodological differences used as common practice in the literature. We further synthesized results from 14 aquatic and soil leachate BDOC studies from across the circum-arctic permafrost region to examine pan-Arctic trends in BDOC. An increasing extent of permafrost across the landscape resulted in higher BDOC losses in both soil and aquatic systems. We hypothesize that the unique composition of permafrost-derived DOC combined with limited prior microbial processing due to low soil temperature and relatively shorter flow path lengths and transport times, resulted in higher overall terrestrial and freshwater BDOC loss. Additionally, we found that the fraction of BDOC decreased moving down the fluvial network in continuous permafrost regions, i.e. from streams to large rivers, suggesting that highly biodegradable DOC is lost in headwater streams. We also observed a seasonal (January-December) decrease in BDOC losses in large streams and rivers, but no apparent change in smaller streams and soil leachates. We attribute this seasonal change to a combination of factors including shifts in carbon source, changing DOC residence time related to increasing thaw-depth, increasing water temperatures later in the summer, as well as decreasing hydrologic connectivity between soils and surface water as the seasons progress. Our results suggest that future, climate warming-induced shifts of continuous permafrost into discontinuous permafrost regions could affect the degradation potential of thaw-released DOC as well as its variability throughout the Arctic summer. We lastly present a recommended standardized BDOC protocol to facilitate the comparison of future work and improve our knowledge of processing and transport of DOC in a changing Arctic. [ABSTRACT FROM AUTHOR]

Published
2015
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12. Lagged Wetland CH4Flux Response in a Historically Wet Year

Author

Turner, J., Desai, A. R., Thom, J., and Wickland, K. P.

Abstract

While a stimulating effect of plant primary productivity on soil carbon dioxide (CO2) emissions has been well documented, links between gross primary productivity (GPP) and wetland methane (CH4) emissions are less well investigated. Determination of the influence of primary productivity on wetland CH4emissions (FCH4) is complicated by confounding influences of water table level and temperature on CH4production, which also vary seasonally. Here, we evaluate the link between preceding GPP and subsequent FCH4at two fens in Wisconsin using eddy covariance flux towers, Lost Creek (US‐Los) and Allequash Creek (US‐ALQ). Both wetlands are mosaics of forested and shrub wetlands, with US‐Los being larger in scale and having a more open canopy. Co‐located sites with multi‐year observations of flux, hydrology, and meteorology provide an opportunity to measure and compare lag effects on FCH4without interference due to differing climate. Daily average FCH4from US‐Los reached a maximum of 47.7 ηmol CH4m−2s−1during the study period, while US‐ALQ was more than double at 117.9 ηmol CH4m−2s−1. The lagged influence of GPP on temperature‐normalized FCH4(Tair‐FCH4) was weaker and more delayed in a year with anomalously high precipitation than a following drier year at both sites. FCH4at US‐ALQ was lower coincident with higher stream discharge in the wet year (2019), potentially due to soil gas flushing during high precipitation events and lower water temperatures. Better understanding of the lagged influence of GPP on FCH4due to this study has implications for climate modeling and more accurate carbon budgeting. Research on what controls wetland methane emissions is continually advancing, and while this is beneficial for predicting future climate scenarios, there is still a need to understand how changes in plant productivity will influence wetland methane emissions. In this study, we investigated the strength and lag time of the relationship between gross primary productivity due to photosynthesizing plants and wetland methane flux in two closely situated sites. We also looked at how hydrology might change that relationship. We found the total amount of methane emitted in an extremely wet year was less than what was emitted in the following drier year at both wetlands potentially because of less carbon provided to the soil by photosynthesizing plants. The difference in methane emissions from one year to the next could be influenced by wetland hydrology, water temperature, or other conditions that impact methane‐producing bacteria. Results from this study will help scientists better predict methane emissions following high precipitation years which may become more common in a changing climate. Analyzed lagged response of methane flux to different driver variables at two closely located fen wetlands in WisconsinAir‐temperature normalization of methane flux was crucial for interpretation of lagged responses, especially in wet yearLagged response of methane flux to gross primary productivity surpassed 60 days and had weaker correlation during wet year at both sites Analyzed lagged response of methane flux to different driver variables at two closely located fen wetlands in Wisconsin Air‐temperature normalization of methane flux was crucial for interpretation of lagged responses, especially in wet year Lagged response of methane flux to gross primary productivity surpassed 60 days and had weaker correlation during wet year at both sites

Published
2021
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