Modern foraminifera assemblages in the Amundsen Sea Embayment
The West Antarctic Ice Sheet (WAIS) is considered the most unstable part of the Antarctic Ice Sheet. As the WAIS is mostly grounded below sea level, its stability is of great concern. A collapse of large parts of the WAIS would result in a significant global sea-level rise. At present, the WAIS show...
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European Geoscience Union
2015
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ftawi:oai:epic.awi.de:37926 2023-05-15T13:23:54+02:00 Modern foraminifera assemblages in the Amundsen Sea Embayment Jernas, Patrycja Ewa Kuhn, Gerhard Hillenbrand, Claus-Dieter Rasmussen, Tine Lander Forwick, Matthias Mackensen, Andreas Schröder, Michael Smith, James A. Klages, Johann Philipp 2015 application/pdf https://epic.awi.de/id/eprint/37926/ https://epic.awi.de/id/eprint/37926/1/Jernas_etal_EGU2015-12040-1.pdf https://hdl.handle.net/10013/epic.45495 https://hdl.handle.net/10013/epic.45495.d001 unknown European Geoscience Union https://epic.awi.de/id/eprint/37926/1/Jernas_etal_EGU2015-12040-1.pdf https://hdl.handle.net/10013/epic.45495.d001 Jernas, P. E. , Kuhn, G. orcid:0000-0001-6069-7485 , Hillenbrand, C. D. , Rasmussen, T. L. , Forwick, M. , Mackensen, A. orcid:0000-0002-5024-4455 , Schröder, M. , Smith, J. A. and Klages, J. P. orcid:0000-0003-0968-1183 (2015) Modern foraminifera assemblages in the Amundsen Sea Embayment , EGU General Assembly 2015, Vienna, Austria, 12 April 2015 - 17 April 2015 . hdl:10013/epic.45495 EPIC3EGU General Assembly 2015, Vienna, Austria, 2015-04-12-2015-04-17European Geoscience Union Conference notRev 2015 ftawi 2021-12-24T15:40:28Z The West Antarctic Ice Sheet (WAIS) is considered the most unstable part of the Antarctic Ice Sheet. As the WAIS is mostly grounded below sea level, its stability is of great concern. A collapse of large parts of the WAIS would result in a significant global sea-level rise. At present, the WAIS shows dramatic ice loss in its Amundsen Sea sector, especially in Pine Island Bay. Pine Island Glacier (PIG) is characterised by fast flow, major thinning and rapid grounding-line retreat. Its mass los over recent decades is generally attributed to melting caused by the inflow of warm Circumpolar Deep Water (CDW). Future melting of PIG may result in a sea level tipping point, because it could trigger widespread collapse of the WAIS, especially when considering ongoing climate change. Our research project aims to establish proxies (integration of foraminifera, sediment properties and oceanographic data) for modern environmental conditions by analysing seafloor surface sediments along a transect from the glacier proximal settings to the middle-outer shelf in the eastern Amundsen Sea Embayment. These proxies will then be applied on sediment records spanning the Holocene back to the Last Glacial Maximum for reconstructing spatial and temporal variations of CDW upwelling and ice-ocean interactions during the past c. 23,000 years. We will present preliminary results from the analyses of ten short marine sediment cores (multi and box cores) collected during expeditions JR179 (2008) and ANT-XXVI/3 (2010) along a transect from inner Pine Island Bay to the middle-outer shelf part of the Abbot Palaeo-Ice Stream Trough at water depths ranging from 458 m (middle shelf) to 1444 m (inner shelf). The sediment cores are currently investigated for distribution patterns of planktonic and benthic foraminifera and grain-size distribution at 1 cm resolution. Core tops (0-10 cm) were stained with Rose Bengal for living benthic foraminifera investigations. The chronology of the cores will be based on 210Pb and calibrated 14C dates. First results reveal the presence of living benthic foraminifera in surface sediments of all investigated cores suggesting that modern seabed surfaces were recovered. Moreover, a core retrieved from a water depth of 793 m in the Abbot Palaeo-Ice Stream Trough shows particularly high abundances of planktonic foraminifera Neogloboquadrina pachyderma. Conference Object Amundsen Sea Antarc* Antarctic Ice Sheet Neogloboquadrina pachyderma Pine Island Bay Pine Island Glacier Planktonic foraminifera Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The West Antarctic Ice Sheet (WAIS) is considered the most unstable part of the Antarctic Ice Sheet. As the WAIS is mostly grounded below sea level, its stability is of great concern. A collapse of large parts of the WAIS would result in a significant global sea-level rise. At present, the WAIS shows dramatic ice loss in its Amundsen Sea sector, especially in Pine Island Bay. Pine Island Glacier (PIG) is characterised by fast flow, major thinning and rapid grounding-line retreat. Its mass los over recent decades is generally attributed to melting caused by the inflow of warm Circumpolar Deep Water (CDW). Future melting of PIG may result in a sea level tipping point, because it could trigger widespread collapse of the WAIS, especially when considering ongoing climate change. Our research project aims to establish proxies (integration of foraminifera, sediment properties and oceanographic data) for modern environmental conditions by analysing seafloor surface sediments along a transect from the glacier proximal settings to the middle-outer shelf in the eastern Amundsen Sea Embayment. These proxies will then be applied on sediment records spanning the Holocene back to the Last Glacial Maximum for reconstructing spatial and temporal variations of CDW upwelling and ice-ocean interactions during the past c. 23,000 years. We will present preliminary results from the analyses of ten short marine sediment cores (multi and box cores) collected during expeditions JR179 (2008) and ANT-XXVI/3 (2010) along a transect from inner Pine Island Bay to the middle-outer shelf part of the Abbot Palaeo-Ice Stream Trough at water depths ranging from 458 m (middle shelf) to 1444 m (inner shelf). The sediment cores are currently investigated for distribution patterns of planktonic and benthic foraminifera and grain-size distribution at 1 cm resolution. Core tops (0-10 cm) were stained with Rose Bengal for living benthic foraminifera investigations. The chronology of the cores will be based on 210Pb and calibrated 14C dates. First results reveal the presence of living benthic foraminifera in surface sediments of all investigated cores suggesting that modern seabed surfaces were recovered. Moreover, a core retrieved from a water depth of 793 m in the Abbot Palaeo-Ice Stream Trough shows particularly high abundances of planktonic foraminifera Neogloboquadrina pachyderma. |
format |
Conference Object |
author |
Jernas, Patrycja Ewa Kuhn, Gerhard Hillenbrand, Claus-Dieter Rasmussen, Tine Lander Forwick, Matthias Mackensen, Andreas Schröder, Michael Smith, James A. Klages, Johann Philipp |
spellingShingle |
Jernas, Patrycja Ewa Kuhn, Gerhard Hillenbrand, Claus-Dieter Rasmussen, Tine Lander Forwick, Matthias Mackensen, Andreas Schröder, Michael Smith, James A. Klages, Johann Philipp Modern foraminifera assemblages in the Amundsen Sea Embayment |
author_facet |
Jernas, Patrycja Ewa Kuhn, Gerhard Hillenbrand, Claus-Dieter Rasmussen, Tine Lander Forwick, Matthias Mackensen, Andreas Schröder, Michael Smith, James A. Klages, Johann Philipp |
author_sort |
Jernas, Patrycja Ewa |
title |
Modern foraminifera assemblages in the Amundsen Sea Embayment |
title_short |
Modern foraminifera assemblages in the Amundsen Sea Embayment |
title_full |
Modern foraminifera assemblages in the Amundsen Sea Embayment |
title_fullStr |
Modern foraminifera assemblages in the Amundsen Sea Embayment |
title_full_unstemmed |
Modern foraminifera assemblages in the Amundsen Sea Embayment |
title_sort |
modern foraminifera assemblages in the amundsen sea embayment |
publisher |
European Geoscience Union |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/37926/ https://epic.awi.de/id/eprint/37926/1/Jernas_etal_EGU2015-12040-1.pdf https://hdl.handle.net/10013/epic.45495 https://hdl.handle.net/10013/epic.45495.d001 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
geographic |
Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Pine Island Glacier Island Bay Pine Island Bay |
geographic_facet |
Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Pine Island Glacier Island Bay Pine Island Bay |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Neogloboquadrina pachyderma Pine Island Bay Pine Island Glacier Planktonic foraminifera |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Neogloboquadrina pachyderma Pine Island Bay Pine Island Glacier Planktonic foraminifera |
op_source |
EPIC3EGU General Assembly 2015, Vienna, Austria, 2015-04-12-2015-04-17European Geoscience Union |
op_relation |
https://epic.awi.de/id/eprint/37926/1/Jernas_etal_EGU2015-12040-1.pdf https://hdl.handle.net/10013/epic.45495.d001 Jernas, P. E. , Kuhn, G. orcid:0000-0001-6069-7485 , Hillenbrand, C. D. , Rasmussen, T. L. , Forwick, M. , Mackensen, A. orcid:0000-0002-5024-4455 , Schröder, M. , Smith, J. A. and Klages, J. P. orcid:0000-0003-0968-1183 (2015) Modern foraminifera assemblages in the Amundsen Sea Embayment , EGU General Assembly 2015, Vienna, Austria, 12 April 2015 - 17 April 2015 . hdl:10013/epic.45495 |
_version_ |
1766376200382447616 |