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1. Late Miocene to Early Pliocene paleoceanographic evolution of the Central South Pacific: A deep-sea benthic foraminiferal perspective

Author

Das, S, Mahanta, N, Sahoo, B, Singh, R, Alvarez Zarikian, C, Tiwari, M, Vats, N, Nihal, Lamy, F, Winckler, G, Middleton, J, Arz, H, Gottschalk, J, Basak, C, Brombacher, A, Esper, O, Farmer, J, Herbert, L, Iwasaki, S, Lembke-Jene, L, Lawson, V, Lo, L, Malinverno, E, Michel, E, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Seo, I, Smith, R, Souza, A, Stoner, J, de Oliveira, I, Wan, S, Zhao, X, Das S. K., Mahanta N., Sahoo B., Singh R. K., Alvarez Zarikian C. A., Tiwari M., Vats N., Lamy F., Winckler G., Middleton J. L., Arz H. W., Gottschalk J., Basak C., Brombacher A., Esper O. M., Farmer J. R., Herbert L. C., Iwasaki S., Lembke-Jene L., Lawson V. J., Lo L., Malinverno E., Michel E., Moretti S., Moy C. M., Ravelo A. C., Riesselman C. R., Saavedra-Pellitero M., Seo I., Smith R. A., Souza A. L., Stoner J. S., de Oliveira I. V. M. P., Wan S., Zhao X., Das, S, Mahanta, N, Sahoo, B, Singh, R, Alvarez Zarikian, C, Tiwari, M, Vats, N, Nihal, Lamy, F, Winckler, G, Middleton, J, Arz, H, Gottschalk, J, Basak, C, Brombacher, A, Esper, O, Farmer, J, Herbert, L, Iwasaki, S, Lembke-Jene, L, Lawson, V, Lo, L, Malinverno, E, Michel, E, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Seo, I, Smith, R, Souza, A, Stoner, J, de Oliveira, I, Wan, S, Zhao, X, Das S. K., Mahanta N., Sahoo B., Singh R. K., Alvarez Zarikian C. A., Tiwari M., Vats N., Lamy F., Winckler G., Middleton J. L., Arz H. W., Gottschalk J., Basak C., Brombacher A., Esper O. M., Farmer J. R., Herbert L. C., Iwasaki S., Lembke-Jene L., Lawson V. J., Lo L., Malinverno E., Michel E., Moretti S., Moy C. M., Ravelo A. C., Riesselman C. R., Saavedra-Pellitero M., Seo I., Smith R. A., Souza A. L., Stoner J. S., de Oliveira I. V. M. P., Wan S., and Zhao X.

Abstract

The bottom water conditions in the Central South Pacific (CSP) and associated changes in the Lower Circumpolar Deep Water (LCDW) and Antarctic Bottom Water (AABW) under warmer-than-present conditions need to be better understood. These water masses transfer their properties to the major ocean basins. We analyzed Late Miocene to Early Pliocene (5.6–3.6 Ma) marine sediment core sections from the CSP for benthic foraminifera, ice rafted debris (IRD), Ostracoda, planktic foraminifera Orbulina universa abundance, and organic geochemical proxies to assess the bottom water characteristics under warmer-than-present day conditions. A significant increase in IRD abundance between 5.3 and 4.9 Ma marks the Early Pliocene warm phase. The benthic foraminiferal assemblages indicate shifts in bottom water conditions over time in the CSP region. Between 5.6 and 5.3 Ma, predominantly oxygenated bottom water with moderate organic matter flux prevailed. This shifted to suboxic conditions with increased organic matter flux from 5.3 to 4.9 Ma. Subsequently, between 4.9 and 4.4 Ma, bottom water conditions alternated frequently between oxic and suboxic states. Enhanced bottom water formation and inflow of LCDW and AABW in the CSP during 4.4–4.0 Ma promoted oxygenated conditions, accompanied by low organic export flux. However, sluggish bottom water circulation from 4.0 to 3.6 Ma reverted to suboxic conditions, associated with increased carbon burial. Notably, productivity peaked intermittently between 5.3 and 3.6 Ma, as indicated by the occurrence of suboxic species assemblages and increase in the abundance of Orbulina universa, benthic microfauna (ostracods), and other paleoproductivity indicators.

Published
2024

2. Five million years of Antarctic Circumpolar Current strength variability

Author

Lamy, F, Winckler, G, Arz, H, Farmer, J, Gottschalk, J, Lembke-Jene, L, Middleton, J, van der Does, M, Tiedemann, R, Alvarez Zarikian, C, Basak, C, Brombacher, A, Dumm, L, Esper, O, Herbert, L, Iwasaki, S, Kreps, G, Lawson, V, Lo, L, Malinverno, E, Martinez-Garcia, A, Michel, E, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Sadatzki, H, Seo, I, Singh, R, Smith, R, Souza, A, Stoner, J, Toyos, M, de Oliveira, I, Wan, S, Wu, S, Zhao, X, Lamy F., Winckler G., Arz H. W., Farmer J. R., Gottschalk J., Lembke-Jene L., Middleton J. L., van der Does M., Tiedemann R., Alvarez Zarikian C., Basak C., Brombacher A., Dumm L., Esper O. M., Herbert L. C., Iwasaki S., Kreps G., Lawson V. J., Lo L., Malinverno E., Martinez-Garcia A., Michel E., Moretti S., Moy C. M., Ravelo A. C., Riesselman C. R., Saavedra-Pellitero M., Sadatzki H., Seo I., Singh R. K., Smith R. A., Souza A. L., Stoner J. S., Toyos M., de Oliveira I. M. V. P., Wan S., Wu S., Zhao X., Lamy, F, Winckler, G, Arz, H, Farmer, J, Gottschalk, J, Lembke-Jene, L, Middleton, J, van der Does, M, Tiedemann, R, Alvarez Zarikian, C, Basak, C, Brombacher, A, Dumm, L, Esper, O, Herbert, L, Iwasaki, S, Kreps, G, Lawson, V, Lo, L, Malinverno, E, Martinez-Garcia, A, Michel, E, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Sadatzki, H, Seo, I, Singh, R, Smith, R, Souza, A, Stoner, J, Toyos, M, de Oliveira, I, Wan, S, Wu, S, Zhao, X, Lamy F., Winckler G., Arz H. W., Farmer J. R., Gottschalk J., Lembke-Jene L., Middleton J. L., van der Does M., Tiedemann R., Alvarez Zarikian C., Basak C., Brombacher A., Dumm L., Esper O. M., Herbert L. C., Iwasaki S., Kreps G., Lawson V. J., Lo L., Malinverno E., Martinez-Garcia A., Michel E., Moretti S., Moy C. M., Ravelo A. C., Riesselman C. R., Saavedra-Pellitero M., Sadatzki H., Seo I., Singh R. K., Smith R. A., Souza A. L., Stoner J. S., Toyos M., de Oliveira I. M. V. P., Wan S., Wu S., and Zhao X.

Abstract

The Antarctic Circumpolar Current (ACC) represents the world’s largest ocean-current system and affects global ocean circulation, climate and Antarctic ice-sheet stability1–3. Today, ACC dynamics are controlled by atmospheric forcing, oceanic density gradients and eddy activity4. Whereas palaeoceanographic reconstructions exhibit regional heterogeneity in ACC position and strength over Pleistocene glacial–interglacial cycles5–8, the long-term evolution of the ACC is poorly known. Here we document changes in ACC strength from sediment cores in the Pacific Southern Ocean. We find no linear long-term trend in ACC flow since 5.3 million years ago (Ma), in contrast to global cooling9 and increasing global ice volume10. Instead, we observe a reversal on a million-year timescale, from increasing ACC strength during Pliocene global cooling to a subsequent decrease with further Early Pleistocene cooling. This shift in the ACC regime coincided with a Southern Ocean reconfiguration that altered the sensitivity of the ACC to atmospheric and oceanic forcings11–13. We find ACC strength changes to be closely linked to 400,000-year eccentricity cycles, probably originating from modulation of precessional changes in the South Pacific jet stream linked to tropical Pacific temperature variability14. A persistent link between weaker ACC flow, equatorward-shifted opal deposition and reduced atmospheric CO2 during glacial periods first emerged during the Mid-Pleistocene Transition (MPT). The strongest ACC flow occurred during warmer-than-present intervals of the Plio-Pleistocene, providing evidence of potentially increasing ACC flow with future climate warming.

Published
2024

3. Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene

Author

Patterson, M. O, McKay, R., Naish, T., Escutia, C., Jimenez-Espejo, F. J, Raymo, M. E, Meyers, S. R, Tauxe, L., Brinkhuis, H., Klaus, A., Fehr, A., Bendle, J. A. P, Bijl, P. K, Bohaty, S. M, Carr, S. A, Dunbar, R. B, Flores, J. A, Gonzalez, J. J, Hayden, T. G, Iwai, M., Katsuki, K., Kong, G. S, Nakai, M., Olney, M. P, Passchier, S., Pekar, S. F, Pross, J., Riesselman, C. R, Röhl, U., Sakai, T., Shrivastava, P. K, Stickley, C. E, Sugasaki, S., Tuo, S., van de Flierdt, T., Welsh, K., Williams, T., and Yamane, M.

Published
2014

5. Expedition 383 summary

Author

Lamy, F., Winckler, G., Alvarez Zarikian, C.A., and the Expedition 383 Scientists, Winckler, G, Lamy, F, Alvarez Zarikian, C, Arz, H, Basak, C, Brombacher, A, Esper, O, Farmer, J, Gottschalk, J, Herbert, L, Iwasaki, S, Lawson, V, Lembke-Jene, L, Lo, L, Malinverno, E, Michel, E, Middleton, J, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Seo, I, Singh, R, Smith, R, Souza, A, Stoner, J, Venancio, I, Wan, S, Zhao, X, Foucher McColl, N, Winckler, G., Lamy, F., Alvarez Zarikian, C. A., Arz, H. W., Basak, C., Brombacher, A., Esper, O. M., Farmer, J. R., Gottschalk, J., Herbert, L. C., Iwasaki, S., Lawson, V. J., Lembke-Jene, L., Lo, L., Malinverno, E., Michel, E., Middleton, J. L., Moretti, S., Moy, C. M., Ravelo, A. C., Riesselman, C. R., Saavedra-Pellitero, M., Seo, I., Singh, R. K., Smith, R. A., Souza, A. L., Stoner, J. S., Venancio, I. M., Wan, S., Zhao, X., Foucher McColl, N., Lamy, F., Winckler, G., Alvarez Zarikian, C.A., and the Expedition 383 Scientists, Winckler, G, Lamy, F, Alvarez Zarikian, C, Arz, H, Basak, C, Brombacher, A, Esper, O, Farmer, J, Gottschalk, J, Herbert, L, Iwasaki, S, Lawson, V, Lembke-Jene, L, Lo, L, Malinverno, E, Michel, E, Middleton, J, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Seo, I, Singh, R, Smith, R, Souza, A, Stoner, J, Venancio, I, Wan, S, Zhao, X, Foucher McColl, N, Winckler, G., Lamy, F., Alvarez Zarikian, C. A., Arz, H. W., Basak, C., Brombacher, A., Esper, O. M., Farmer, J. R., Gottschalk, J., Herbert, L. C., Iwasaki, S., Lawson, V. J., Lembke-Jene, L., Lo, L., Malinverno, E., Michel, E., Middleton, J. L., Moretti, S., Moy, C. M., Ravelo, A. C., Riesselman, C. R., Saavedra-Pellitero, M., Seo, I., Singh, R. K., Smith, R. A., Souza, A. L., Stoner, J. S., Venancio, I. M., Wan, S., Zhao, X., and Foucher McColl, N.

Abstract

The Antarctic Circumpolar Current (ACC), the world’s strongest zonal current system, connects all three major ocean basins of the global ocean and therefore integrates and responds to global climate variability. Its flow is largely driven by strong westerly winds and is constricted to its narrowest extent in the Drake Passage. Fresh and cold Pacific surface and intermediate water flowing through the Drake Passage (cold-water route) and warm Indian Ocean water masses flowing through the Agulhas region (warm-water route) are critical for the South Atlantic contribution to Meridional Overturning Circulation changes. Furthermore, physical and biological processes associated with the ACC affect the strength of the ocean carbon pump and therefore are critical to feedbacks linking atmospheric CO2 concentrations, ocean circulation, and climate/cryosphere on a global scale. In contrast to the Atlantic and Indian sectors of the ACC, and with the exception of drill cores from the Antarctic continental margin and off New Zealand, there are no deep-sea drilling paleoceanographic records from the Pacific sector of the ACC. To advance our understanding of Miocene to Holocene atmosphere-ocean-cryosphere dynamics in the Pacific and their implications for regional and global climate and atmospheric CO2, International Ocean Discovery Program Expedition 383 recovered sedimentary sequences at (1) three sites in the central South Pacific (CSP) (U1539, U1540, and U1541), (2) two sites at the Chilean margin (U1542 and U1544), and (3) one site from the pelagic eastern South Pacific (U1543) close to the entrance to the Drake Passage. Because of persistently stormy conditions and the resulting bad weather avoidance, we were not successful in recovering the originally planned Proposed Site CSP-3A in the Polar Frontal Zone of the CSP. The drilled sediments at Sites U1541 and U1543 reach back to the late Miocene, and those at Site U1540 reach back to the early Pliocene. High sedimentation rate s

Published
2021

8. International Ocean Discovery Program. Expedition 383 Preliminary Report. Dynamics of the Pacific Antarctic Circumpolar Current (DYNAPACC). 20 May–20 July 2019

Author

Lamy, F, Winckler, G, Alvarez Zarikian, C, Arz, H, Basak, C, Brombacher, A, Esper, O, Farmer, J, Gottschalk, J, Herbert, L, Iwasaki, S, Lawson, V, Lembke-Jene, L, Lo, L, de Souza, A, Malinverno, E, Michel, E, Middleton, J, Moretti, S, Moy, C, Ravelo, C, Riesselman, C, Pellitero, M, Mccoll, N, Proctor, S, Seo, I, Singh, R, Smith, R, Stoner, J, Venancio P de Oliveira, I, Wan, S, Zhao, X, Cimagala, B, Wilkins, A, Lamy, F, Winckler, G, Alvarez Zarikian, C, Arz, H, Basak, C, Brombacher, A, Esper, O, Farmer, J, Gottschalk, J, Herbert, L, Iwasaki, S, Lawson, V, Lembke-Jene, L, Lo, L, de Souza, A, Malinverno, E, Michel, E, Middleton, J, Moretti, S, Moy, C, Ravelo, C, Riesselman, C, Pellitero, M, Mccoll, N, Proctor, S, Seo, I, Singh, R, Smith, R, Stoner, J, Venancio P de Oliveira, I, Wan, S, Zhao, X, Cimagala, B, and Wilkins, A

Subjects
Antarctic Circumpolar Current, Paleoclimate
Abstract

The Antarctic Circumpolar Current (ACC) is the world’s strongest zonal current system that connects all three major ocean basins of the global ocean and therefore integrates and responds to global climate variability. Its flow is largely driven by strong westerly winds and constricted to its narrowest extent in the Drake Passage. Transport of fresh and cold surface and intermediate water masses through the Drake Passage (cold-water route) strongly affects the Atlantic Meridional Overturning Circulation together with the inflow of Indian Ocean water masses (warm-water route). Both oceanographic corridors are critical for the South Atlantic contribution to Meridional Overturning Circulation changes. In contrast to the Atlantic and Indian sectors of the ACC, and with the exception of drill cores from the Antarctic continental margin and off New Zealand, the Pacific sector of the ACC lacks information on its Cenozoic paleoceanography from deep-sea drilling records. To advance our knowledge and understanding of Miocene to Holocene atmosphere-ocean-cryosphere dynamics in the Pacific and their implications for regional and global climate and atmospheric CO2, International Ocean Discovery Program (IODP) Expedition 383 recovered sedimentary sequences at (1) three sites located in the central South Pacific (U1539, U1540, and U1541), (2) two sites at the Chile margin (U1542 and U1544), and (3) one site from the pelagic eastern South Pacific (U1543) close to the entrance to the Drake Passage. Because of persistently stormy conditions and the resulting bad weather avoidance, we were not successful in recovering the originally planned Proposed Site CSP-3A in the central South Pacific in the Polar Frontal Zone. The drilled sediments at Sites U1541 and U1543 reach back to the late Miocene, and those at Site U1540 reach back to the early Pliocene. High sedimentary rate Pleistocene sedimentary sequences were drilled both in the central South Pacific (Site U1539) and along the Chile margin. Taken together, the sites represent a depth transect from ~1100 m at the Chile margin site (U1542) to ~4070 m in the central South Pacific (Site U1539) and allow investigation of changes in the vertical structure of the ACC, a key issue for understanding the role of the Southern Ocean in the global carbon cycle. The sites are located at latitudes and water depths where sediments will allow the application of a wide range of siliciclastic-, carbonate-, and opal-based proxies to address our objectives of reconstructing with unprecedented stratigraphic detail surface to deep-ocean variations and their relation to atmosphere and cryosphere changes through stadial to interstadial, glacial to interglacial, and warmer than present time intervals.

Published
2019

9. Obliquity-paced Pliocene West Antarctic ice sheet oscillations

Author

Naish, T., Powell, R., Levy, R., Wilson, G., Scherer, R., Talarico, F., Krissek, L., Niessen, F., Pompilio, M., Wilson, T., Carter, L., DeConto, R., Huybers, P., McKay, R., Pollard, D., Ross, J., Winter, D., Barrett, P., Browne, G., Cody, R., Cowan, E., Crampton, J., Dunbar, G., Dunbar, N., Florindo, F., Gebhardt, C., Graham, I., Hannah, M., Hansaraj, D., Harwood, D., Helling, D., Henrys, S., Hinnov, L., Kuhn, G., Kyle, P., Läufer, A., Maffioli, P., Magens, D., Mandernack, K., McIntosh, W., Millan, C., Morin, R., Ohneiser, C., Paulsen, T., Persico, D., Raine, I., Reed, J., Riesselman, C., Sagnotti, L., Schmitt, D., Sjunneskog, C., Strong, P., Taviani, M., Vogel, S., Wilch, T., and Williams, T.

Published
2009
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11. Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene

Author

Marine palynology and palaeoceanography, Marine Palynology, Patterson, M. O., McKay, R., Naish, T., Escutia, C., Jimenez-Espejo, F. J., Raymo, M. E., Meyers, S. R., Tauxe, L., Brinkhuis, H., Klaus, A., Fehr, A., Bendle, J. A P, Bijl, P. K., Bohaty, S. M., Carr, S. A., Dunbar, R. B., Flores, J. A., Gonzalez, J. J., Hayden, T. G., Iwai, M., Katsuki, K., Kong, G. S., Nakai, M., Olney, M. P., Passchier, S., Pekar, S. F., Pross, J., Riesselman, C. R., Röhl, U., Sakai, T., Shrivastava, P. K., Stickley, C. E., Sugasaki, S., Tuo, S., Van De Flierdt, T., Welsh, K., Williams, T., Yamane, M., Marine palynology and palaeoceanography, Marine Palynology, Patterson, M. O., McKay, R., Naish, T., Escutia, C., Jimenez-Espejo, F. J., Raymo, M. E., Meyers, S. R., Tauxe, L., Brinkhuis, H., Klaus, A., Fehr, A., Bendle, J. A P, Bijl, P. K., Bohaty, S. M., Carr, S. A., Dunbar, R. B., Flores, J. A., Gonzalez, J. J., Hayden, T. G., Iwai, M., Katsuki, K., Kong, G. S., Nakai, M., Olney, M. P., Passchier, S., Pekar, S. F., Pross, J., Riesselman, C. R., Röhl, U., Sakai, T., Shrivastava, P. K., Stickley, C. E., Sugasaki, S., Tuo, S., Van De Flierdt, T., Welsh, K., Williams, T., and Yamane, M.

Published
2014

13. Preliminary Integrated Chronostratigraphy of the AND-2A Core, ANDRILL Southern McMurdo Sound Project, Antarctica

Author

Acton, G., Crampton, J., Di Vincenzo, G., Fielding, C. R., Florindo, F., Hannah, M., Harwood, D. M., Ishman, S., Johnson, K., Jovane, L., Levy, R. H., Lum, B., Marcano, M. C., Mukasa, S., Ohneiser, C., Olney, M. P., Riesselman, C., Sagnotti, L., Stefano, C., Strada, E., Taviani, M., Tuzzi, E., Verosub, K. L., Wilson, S. G., Zattin, M., ANDRILL-SMS Science Team, Tra, Cui, and Cornamusini, G.

Subjects
chronostratigraphy, Antarctica
Abstract

We use all available chronostratigraphic constraints - biostratigraphy, magnetostratigraphy, radioisotopic dates, strontium-isotope stratigraphy, and correlation of compositional and physical properties to well-dated global or regional records - to construct a preliminary age model for ANDRILL SMS Project's AND-2A drillcore (77°45.488'S, 165°16.605'E, 383.57 m water depth). These diverse chronostratigraphic constraints are consistent with each other and are distributed throughout the 1138.54 m-thick section, resulting in a well-constrained age model. The sedimentary succession comprises a thick early and middle Miocene section below 224.82 mbsf and a condensed middle/late Miocene to Recent section above this. The youngest sediments are Brunhes age (

Published
2009

14. Leg 208 synthesis: Cenozoic climate cycles and excursions

Author

Kroon, D., Zachos, J.C., Blum, P., Bowles, J., Gaillot, P., Hasegawa, T., Hathorne, E.C., Hodell, D.A., Kelly, D.C., Jung, J.-H., Keller, S.M., Lee, Y.-S., Leuschner, D.C., Kyger, Z.L., Lohmann, C., Lourens, L.J., Monechi, S., Nicolo, M., Raffi, I., Riesselman, C., Röhl, U., Schellenberg, S.A., Schmidt, D., Sluijs, A., Thomas, D., Thomas, E., Vallius, H., Richter, C., Palaeobotany and Palynology, The astronomical timescale, Dep Biologie, and Stratigraphy and paleontology

Subjects
Biologie/Milieukunde (BIOL), Other biological specialities, Geowetenschappen en aanverwante (milieu)wetenschappen, Aardwetenschappen/Geologie/Geofysica, Life sciences
Published
2007

15. Sea Surface Temperature of the mid-Piacenzian Ocean: A Data-Model Comparison

Author

Dowsett, H. J., Foley, K. M., Stoll, D. K., Chandler, M. A., Sohl, L. E., Bentsen, M., Otto-Bliesner, B. L., Bragg, F. J., Chan, W-L., Contoux, C., Dolan, A. M., Haywood, A. M., Jonas, J. A., Jost, A., Kamae, Y., Lohmann, Gerrit, Lunt, D. J., Nisancioglu, K. H., Abe-Ouchi, A., Ramstein, G., Riesselman, C., Robinson, M. M., Rosenbloom, N. A., Salzmann, U., Stepanek, Christian, Strother, S. L., Ueda, H., Yan, Q., Zhang, Z., Dowsett, H. J., Foley, K. M., Stoll, D. K., Chandler, M. A., Sohl, L. E., Bentsen, M., Otto-Bliesner, B. L., Bragg, F. J., Chan, W-L., Contoux, C., Dolan, A. M., Haywood, A. M., Jonas, J. A., Jost, A., Kamae, Y., Lohmann, Gerrit, Lunt, D. J., Nisancioglu, K. H., Abe-Ouchi, A., Ramstein, G., Riesselman, C., Robinson, M. M., Rosenbloom, N. A., Salzmann, U., Stepanek, Christian, Strother, S. L., Ueda, H., Yan, Q., and Zhang, Z.

Abstract

The mid-Piacenzian climate represents the most geologically recent interval of long-term average warmth relative to the last million years, and shares similarities with the climate projected for the end of the 21st century. As such, it represents a natural experiment from which we can gain insight into potential climate change impacts, enabling more informed policy decisions for mitigation and adaptation. Here, we present the first systematic comparison of Pliocene sea surface temperature (SST) between an ensemble of eight climate model simulations produced as part of PlioMIP (Pliocene Model Intercomparison Project) with the PRISM (Pliocene Research, Interpretation and Synoptic Mapping) Project mean annual SST field. Our results highlight key regional and dynamic situations where there is discord between the palaeoenvironmental reconstruction and the climate model simulations. These differences have led to improved strategies for both experimental design and temporal refinement of the palaeoenvironmental reconstruction.

Published
2013

16. Antarctic and Southern Ocean influences on Late Pliocene global cooling

Author

McKay, R., Naish, T., Carter, L., Riesselman, C., Dunbar, R., Sjunneskog, C., Winter, D., Sangiorgi, F., Warren, C., Pagani, M., Schouten, S., Willmott, V., Levy, R., DeConto, R.M., Powell, R.D., McKay, R., Naish, T., Carter, L., Riesselman, C., Dunbar, R., Sjunneskog, C., Winter, D., Sangiorgi, F., Warren, C., Pagani, M., Schouten, S., Willmott, V., Levy, R., DeConto, R.M., and Powell, R.D.

Abstract

The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1B sediment core recovered from beneath the Ross Ice Shelf. We provide evidence for a major expansion of an ice sheet in the Ross Sea that began at similar to 3.3 Ma, followed by a coastal sea surface temperature cooling of similar to 2.5 degrees C, a stepwise expansion of sea ice, and polynya-style deep mixing in the Ross Sea between 3.3 and 2.5 Ma. The intensification of Antarctic cooling resulted in strengthened westerly winds and invigorated ocean circulation. The associated northward migration of Southern Ocean fronts has been linked with reduced Atlantic Meridional Overturning Circulation by restricting surface water connectivity between the ocean basins, with implications for heat transport to the high latitudes of the North Atlantic. While our results do not exclude low-latitude mechanisms as drivers for Pliocene cooling, they indicate an additional role played by southern high-latitude cooling during development of the bipolar world.

Published
2012

17. The CO2 sensitivity of Southern Ocean phytoplankton

Author

Tortell, P. D., Payne, C. D., Li, Y., Trimborn, Scarlett, Rost, Bjoern, Smith, W. O., Riesselman, C., Dunbar, R. B., Sedwick, P., DiTullio, G. R., Tortell, P. D., Payne, C. D., Li, Y., Trimborn, Scarlett, Rost, Bjoern, Smith, W. O., Riesselman, C., Dunbar, R. B., Sedwick, P., and DiTullio, G. R.

Published
2008

18. Leg 208 synthesis: Cenozoic climate cycles and excursions

Author

Palaeobotany and Palynology, The astronomical timescale, Dep Biologie, Stratigraphy and paleontology, Kroon, D., Zachos, J.C., Blum, P., Bowles, J., Gaillot, P., Hasegawa, T., Hathorne, E.C., Hodell, D.A., Kelly, D.C., Jung, J.-H., Keller, S.M., Lee, Y.-S., Leuschner, D.C., Kyger, Z.L., Lohmann, C., Lourens, L.J., Monechi, S., Nicolo, M., Raffi, I., Riesselman, C., Röhl, U., Schellenberg, S.A., Schmidt, D., Sluijs, A., Thomas, D., Thomas, E., Vallius, H., Richter, C., Palaeobotany and Palynology, The astronomical timescale, Dep Biologie, Stratigraphy and paleontology, Kroon, D., Zachos, J.C., Blum, P., Bowles, J., Gaillot, P., Hasegawa, T., Hathorne, E.C., Hodell, D.A., Kelly, D.C., Jung, J.-H., Keller, S.M., Lee, Y.-S., Leuschner, D.C., Kyger, Z.L., Lohmann, C., Lourens, L.J., Monechi, S., Nicolo, M., Raffi, I., Riesselman, C., Röhl, U., Schellenberg, S.A., Schmidt, D., Sluijs, A., Thomas, D., Thomas, E., Vallius, H., and Richter, C.

Published
2007

19. Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction

Author

Tauxe, L., primary, Stickley, C. E., additional, Sugisaki, S., additional, Bijl, P. K., additional, Bohaty, S. M., additional, Brinkhuis, H., additional, Escutia, C., additional, Flores, J. A., additional, Houben, A. J. P., additional, Iwai, M., additional, Jiménez-Espejo, F., additional, McKay, R., additional, Passchier, S., additional, Pross, J., additional, Riesselman, C. R., additional, Röhl, U., additional, Sangiorgi, F., additional, Welsh, K., additional, Klaus, A., additional, Fehr, A., additional, Bendle, J. A. P., additional, Dunbar, R., additional, Gonzàlez, J., additional, Hayden, T., additional, Katsuki, K., additional, Olney, M. P., additional, Pekar, S. F., additional, Shrivastava, P. K., additional, van de Flierdt, T., additional, Williams, T., additional, and Yamane, M., additional

Published
2012
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20. MULTIDISCIPLINARY INVESTIGATION OF MCMURDO-ROSS ICE SHELF AND THE UNDERLYING OCEAN AND SEDIMENTS AT WINDLESS BIGHT, ANTARCTICA, BY MEANS OF HOT-WATER DRILLING

Author

Nixdorf, Uwe, Barret, P. J., Dunbar, G. B., Carter, L., Giorgetti, G., Niessen, Frank, Pyne, A. R., Robinson, N., Riesselman, C., Dunker, Erich, Miller, Heinrich, Nixdorf, Uwe, Barret, P. J., Dunbar, G. B., Carter, L., Giorgetti, G., Niessen, Frank, Pyne, A. R., Robinson, N., Riesselman, C., Dunker, Erich, and Miller, Heinrich

Published
2003

24. Antarctic sea ice over the past 130 000 years - Part 1: a review of what proxy records tell us

Author

Xavier Crosta, Karen E. Kohfeld, Helen C. Bostock, Matthew Chadwick, Alice Du Vivier, Oliver Esper, Johan Etourneau, Jacob Jones, Amy Leventer, Juliane Müller, Rachel H. Rhodes, Claire S. Allen, Pooja Ghadi, Nele Lamping, Carina Lange, Kelly-Anne Lawler, David Lund, Alice Marzocchi, Katrin J. Meissner, Laurie Menviel, Abhilash Nair, Molly Patterson, Jennifer Pike, Joseph G. Prebble, Christina Riesselman, Henrik Sadatzki, Louise C. Sime, Sunil K. Shukla, Lena Thöle, Maria-Elena Vorrath, Wenshen Xiao, Jiao Yang, Chadwick, M [0000-0002-3861-4564], Leventer, A [0000-0001-9401-0987], Müller, J [0000-0003-0724-4131], Rhodes, RH [0000-0001-7511-1969], Allen, CS [0000-0002-0938-0551], Lange, CB [0000-0002-2916-4207], Lawler, KA [0000-0002-8770-1365], Marzocchi, A [0000-0002-3430-3574], Menviel, L [0000-0002-5068-1591], Pike, J [0000-0001-9415-6003], Riesselman, C [0000-0002-2436-4306], Sime, LC [0000-0002-9093-7926], Thöle, L [0000-0002-5405-3613], Vorrath, ME [0000-0001-7208-1186], and Apollo - University of Cambridge Repository

Subjects
Global and Planetary Change, 13 Climate Action, Stratigraphy, Paleontology, 37 Earth Sciences, 3705 Geology, 3708 Oceanography, 3709 Physical Geography and Environmental Geoscience, 14 Life Below Water
Abstract

Antarctic sea ice plays a critical role in the Earth system, influencing energy, heat and freshwater fluxes, air–sea gas exchange, ice shelf dynamics, ocean circulation, nutrient cycling, marine productivity and global carbon cycling. However, accurate simulation of recent sea-ice changes remains challenging and, therefore, projecting future sea-ice changes and their influence on the global climate system is uncertain. Reconstructing past changes in sea-ice cover can provide additional insights into climate feedbacks within the Earth system at different timescales. This paper is the first of two review papers from the Cycles of Sea Ice Dynamics in the Earth system (C-SIDE) working group. In this first paper, we review marine- and ice core-based sea-ice proxies and reconstructions of sea-ice changes throughout the last glacial–interglacial cycle. Antarctic sea-ice reconstructions rely mainly on diatom fossil assemblages and highly branched isoprenoid (HBI) alkenes in marine sediments, supported by chemical proxies in Antarctic ice cores. Most reconstructions for the Last Glacial Maximum (LGM) suggest that winter sea ice expanded all around Antarctica and covered almost twice its modern surface extent. In contrast, LGM summer sea ice expanded mainly in the regions off the Weddell and Ross seas. The difference between winter and summer sea ice during the LGM led to a larger seasonal cycle than today. More recent efforts have focused on reconstructing Antarctic sea ice during warm periods, such as the Holocene and the Last Interglacial (LIG), which may serve as an analogue for the future. Notwithstanding regional heterogeneities, existing reconstructions suggest that sea-ice cover increased from the warm mid-Holocene to the colder Late Holocene with pervasive decadal- to millennial-scale variability throughout the Holocene. Studies, supported by proxy modelling experiments, suggest that sea-ice cover was halved during the warmer LIG when global average temperatures were ∼2 ∘C above the pre-industrial (PI). There are limited marine (14) and ice core (4) sea-ice proxy records covering the complete 130 000 year (130 ka) last glacial cycle. The glacial–interglacial pattern of sea-ice advance and retreat appears relatively similar in each basin of the Southern Ocean. Rapid retreat of sea ice occurred during Terminations II and I while the expansion of sea ice during the last glaciation appears more gradual especially in ice core data sets. Marine records suggest that the first prominent expansion occurred during Marine Isotope Stage (MIS) 4 and that sea ice reached maximum extent during MIS 2. We, however, note that additional sea-ice records and transient model simulations are required to better identify the underlying drivers and feedbacks of Antarctic sea-ice changes over the last 130 ka. This understanding is critical to improve future predictions.

Published
2022

25. Proceedings of the International Ocean Discovery Program - Volume 383. Dynamics of the Pacific Antarctic Circumpolar Current

Author

Lamy F., Winckler G., Alvarez Zarikian, C. A. Arz, C. Basak, A. Brombacher, O. M. Esper, J. R. Farmer, J. Gottschalk, L. C. Herbert, S. Iwasaki, V. J. Lawson, L. Lembke-Jene, L. Lo, E. Malinverno, E. Michel, J. L. Middleton, S. Moretti, C. M. Moy, A. C. Ravelo, C. R. Riesselman, M. Saavedra-Pellitero, I. Seo, R. K. Singh, R. A. Smith, A. L. Souza, J. S. Stoner, I. M. Venancio, S. Wan, X. Zhao, and N. Foucher McColl, F., L, G., W, Zarikian, A, Arz, C, Basak, C, Brombacher, A, Esper, O, Farmer, J, Gottschalk, J, Herbert, L, Iwasaki, S, Lawson, V, Lembke-Jene, L, Lo, L, Malinverno, E, Michel, E, Middleton, J, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Seo, I, Singh, R, Smith, R, Souza, A, Stoner, J, Venancio, I, Wan, S, Zhao, X, and Foucher McColl, A

Subjects
Paleoceanography, Antarctic Circumpolar Current, GEO/02 - GEOLOGIA STRATIGRAFICA E SEDIMENTOLOGICA, GEO/01 - PALEONTOLOGIA E PALEOECOLOGIA
Published
2021

26. Expedition 383 summary

Author

Elisa Malinverno, E. Michel, N. Foucher McColl, J. Gottschalk, J.S. Stoner, Mariem Saavedra-Pellitero, V.J. Lawson, L. Lo, S. Moretti, Shiming Wan, Shinya Iwasaki, L.C. Herbert, Gisela Winckler, Igor Martins Venancio, C. A. Alvarez Zarikian, Xiaojian Zhao, Ana Christina Ravelo, C. Basak, Jennifer L. Middleton, Frank Lamy, Christopher M. Moy, A.L. Souza, R.A. Smith, Jesse Farmer, L. Lembke-Jene, Anieke Brombacher, Christina R. Riesselman, Helge W Arz, Oliver Esper, I. Seo, Raj K. Singh, Lamy, F., Winckler, G., Alvarez Zarikian, C.A., and the Expedition 383 Scientists, Winckler, G, Lamy, F, Alvarez Zarikian, C, Arz, H, Basak, C, Brombacher, A, Esper, O, Farmer, J, Gottschalk, J, Herbert, L, Iwasaki, S, Lawson, V, Lembke-Jene, L, Lo, L, Malinverno, E, Michel, E, Middleton, J, Moretti, S, Moy, C, Ravelo, A, Riesselman, C, Saavedra-Pellitero, M, Seo, I, Singh, R, Smith, R, Souza, A, Stoner, J, Venancio, I, Wan, S, Zhao, X, Foucher McColl, N, Lamont-Doherty Earth Observatory (LDEO), Columbia University [New York], Alfred Wegener Institute for Polar and Marine Research (AWI), International Ocean Discovery Program, Leibniz Institute for Baltic Sea Research Warnemünde (IOW), University of Delaware [Newark], National Oceanography Centre (NOC), Department of Geosciences [Princeton], Princeton University, School of Marine and Atmospheric Sciences [Stony Brook] (SoMAS), Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Rutgers, The State University of New Jersey [New Brunswick] (RU), Rutgers University System (Rutgers), National Taïwan University (NTU), Università degli Studi di Milano = University of Milan (UNIMI), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Paléocéanographie (PALEOCEAN), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Max Planck Institute for Chemistry (MPIC), Max-Planck-Gesellschaft, University of Otago [Dunedin, Nouvelle-Zélande], University of California [Santa Cruz] (UC Santa Cruz), University of California (UC), University of Birmingham [Birmingham], Korea Institute of Ocean Science and Technology (KIOST), Indian Institute of Technology Bhubaneshwar, University of Massachusetts [Amherst] (UMass Amherst), University of Massachusetts System (UMASS), State University of Rio de Janeiro, Oregon State University (OSU), Center for Weather Forecasting and Climate Studies [São Paulo] (CPTEC), Instituto Nacional de Pesquisas Espaciais (INPE), Chinese Academy of Sciences [Beijing] (CAS), National Insitute of Polar Research [Japan], National Institute of Polar Research [Tokyo] (NiPR), and Universidad Andrés Bello [Santiago] (UNAB)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, International Ocean Discovery Program, GEO/02 - GEOLOGIA STRATIGRAFICA E SEDIMENTOLOGICA, International Ocean Discovery Program, IODP, JOIDES Resolution, Expedition 383, Dynamics of the Pacific Antarctic Circumpolar Current, Site U1539, Site U1540, Site U1541, Site U1542, Site U1543, Site U1544, Southern Ocean, South Pacific, Chilean margin, paleoceanography, Antarctic Circumpolar Current, oceanic fronts, Circumpolar Deep Water, Antarctic Intermediate Water, marine carbon cycle, dust, biological productivity, iron fertilization, southern westerly winds, Patagonian ice sheet, West Antarctic ice sheet, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, GEO/01 - PALEONTOLOGIA E PALEOECOLOGIA, ComputingMilieux_MISCELLANEOUS, Geology, IODP, JOIDES Resolution, Expedition 383
Abstract

The Antarctic Circumpolar Current (ACC), the world’s strongest zonal current system, connects all three major ocean basins of the global ocean and therefore integrates and responds to global climate variability. Its flow is largely driven by strong westerly winds and is constricted to its narrowest extent in the Drake Passage. Fresh and cold Pacific surface and intermediate water flowing through the Drake Passage (cold-water route) and warm Indian Ocean water masses flowing through the Agulhas region (warm-water route) are critical for the South Atlantic contribution to Meridional Overturning Circulation changes. Furthermore, physical and biological processes associated with the ACC affect the strength of the ocean carbon pump and therefore are critical to feedbacks linking atmospheric CO2 concentrations, ocean circulation, and climate/cryosphere on a global scale. In contrast to the Atlantic and Indian sectors of the ACC, and with the exception of drill cores from the Antarctic continental margin and off New Zealand, there are no deep-sea drilling paleoceanographic records from the Pacific sector of the ACC. To advance our understanding of Miocene to Holocene atmosphere-ocean-cryosphere dynamics in the Pacific and their implications for regional and global climate and atmospheric CO2, International Ocean Discovery Program Expedition 383 recovered sedimentary sequences at (1) three sites in the central South Pacific (CSP) (U1539, U1540, and U1541), (2) two sites at the Chilean margin (U1542 and U1544), and (3) one site from the pelagic eastern South Pacific (U1543) close to the entrance to the Drake Passage. Because of persistently stormy conditions and the resulting bad weather avoidance, we were not successful in recovering the originally planned Proposed Site CSP-3A in the Polar Frontal Zone of the CSP. The drilled sediments at Sites U1541 and U1543 reach back to the late Miocene, and those at Site U1540 reach back to the early Pliocene. High sedimentation rate sequences reaching back to the early Pleistocene (Site U1539) and the late Pleistocene (Sites U1542 and U1544) were recovered in both the CSP and at the Chilean margin. Taken together, the sites represent a depth transect from ~1100 m at Chilean margin Site U1542 to ~4070 m at CSP Site U1539 and allow investigation of changes in the vertical structure of the ACC, a key issue for understanding the role of the Southern Ocean in the global carbon cycle. The sites are located at latitudes and water depths where sediments will allow the application of a wide range of siliciclastic-, carbonate-, and opal-based proxies to address our objectives of reconstructing, with unprecedented stratigraphic detail, surface to deep-ocean variations and their relation to atmosphere and cryosphere changes.

Published
2021
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27. Reorganization of Southern Ocean plankton ecosystem at the onset of Antarctic glaciation.

Author

Houben AJ, Bijl PK, Pross J, Bohaty SM, Passchier S, Stickley CE, Röhl U, Sugisaki S, Tauxe L, van de Flierdt T, Olney M, Sangiorgi F, Sluijs A, Escutia C, Brinkhuis H, Dotti CE, Klaus A, Fehr A, Williams T, Bendle JA, Carr SA, Dunbar RB, Flores JA, Gonzàlez JJ, Hayden TG, Iwai M, Jimenez-Espejo FJ, Katsuki K, Kong GS, McKay RM, Nakai M, Pekar SF, Riesselman C, Sakai T, Salzmann U, Shrivastava PK, Tuo S, Welsh K, and Yamane M

Subjects
Animals, Antarctic Regions, Cold Temperature, Fossils, Adaptation, Physiological, Dinoflagellida physiology, Ecosystem, Ice Cover, Oceans and Seas, Phytoplankton physiology, Zooplankton physiology
Abstract

The circum-Antarctic Southern Ocean is an important region for global marine food webs and carbon cycling because of sea-ice formation and its unique plankton ecosystem. However, the mechanisms underlying the installation of this distinct ecosystem and the geological timing of its development remain unknown. Here, we show, on the basis of fossil marine dinoflagellate cyst records, that a major restructuring of the Southern Ocean plankton ecosystem occurred abruptly and concomitant with the first major Antarctic glaciation in the earliest Oligocene (~33.6 million years ago). This turnover marks a regime shift in zooplankton-phytoplankton interactions and community structure, which indicates the appearance of eutrophic and seasonally productive environments on the Antarctic margin. We conclude that earliest Oligocene cooling, ice-sheet expansion, and subsequent sea-ice formation were important drivers of biotic evolution in the Southern Ocean.

Published
2013
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28. Antarctic and Southern Ocean influences on Late Pliocene global cooling.

Author

McKay R, Naish T, Carter L, Riesselman C, Dunbar R, Sjunneskog C, Winter D, Sangiorgi F, Warren C, Pagani M, Schouten S, Willmott V, Levy R, DeConto R, and Powell RD

Abstract

The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1B sediment core recovered from beneath the Ross Ice Shelf. We provide evidence for a major expansion of an ice sheet in the Ross Sea that began at ∼3.3 Ma, followed by a coastal sea surface temperature cooling of ∼2.5 °C, a stepwise expansion of sea ice, and polynya-style deep mixing in the Ross Sea between 3.3 and 2.5 Ma. The intensification of Antarctic cooling resulted in strengthened westerly winds and invigorated ocean circulation. The associated northward migration of Southern Ocean fronts has been linked with reduced Atlantic Meridional Overturning Circulation by restricting surface water connectivity between the ocean basins, with implications for heat transport to the high latitudes of the North Atlantic. While our results do not exclude low-latitude mechanisms as drivers for Pliocene cooling, they indicate an additional role played by southern high-latitude cooling during development of the bipolar world.

Published
2012
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