Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas
The West Antarctic Ice Sheet (WAIS) is one of the largest potential sources of future sea-level rise, with glaciers draining the WAIS thinning at an accelerating rate over the past 40 years. Due to difficulties in calibrating palaeoceanographic proxies for the Southern Ocean, it remains difficult to...
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ftcopernicus:oai:publications.copernicus.org:bgd89531 2023-05-15T13:23:55+02:00 Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas Spencer-Jones, Charlotte L. McClymont, Erin L. Bale, Nicole J. Hopmans, Ellen C. Schouten, Stefan Müller, Juliane Abrahamsen, E. Povl Allen, Claire Bickert, Torsten Hillenbrand, Claus-Dieter Mawbey, Elaine Peck, Victoria Svalova, Aleksandra Smith, James A. 2020-11-05 application/pdf https://doi.org/10.5194/bg-2020-333 https://bg.copernicus.org/preprints/bg-2020-333/ eng eng doi:10.5194/bg-2020-333 https://bg.copernicus.org/preprints/bg-2020-333/ eISSN: 1726-4189 Text 2020 ftcopernicus https://doi.org/10.5194/bg-2020-333 2020-11-09T17:22:13Z The West Antarctic Ice Sheet (WAIS) is one of the largest potential sources of future sea-level rise, with glaciers draining the WAIS thinning at an accelerating rate over the past 40 years. Due to difficulties in calibrating palaeoceanographic proxies for the Southern Ocean, it remains difficult to assess whether similar changes have occurred earlier during the Holocene or whether there is underlying centennial to millennial scale forcing in oceanic variability. Archaeal lipid – based proxies, specifically Glycerol Dialkyl Glycerol Tetraether (GDGT) (e.g. TEX 86 and TEX 86 L ) are powerful tools for reconstructing ocean temperature, but these proxies have been shown previously to be difficult to apply to the Southern Ocean. A greater understanding of the parameters that control Southern Ocean GDGT distributions would improve the application of these biomarker proxies and thus help provide a longer-term perspective on ocean forcing of Antarctic ice sheet changes. In this study, we characterised intact polar lipid (IPL) - GDGTs, representing (recently) living archaeal population in suspended particulate matter from the Amundsen Sea and the Scotia Sea. Shifts in IPL-GDGT signatures across well-defined fronts of the Southern Ocean revealed a correlation between the physicochemical parameters of these water masses and IPL-GDGT distributions. Further analysis is required to elucidate the additional role of productivity and nutrient availability on Southern Ocean IPL-GDGT distributions. Of particular note for proxy development in the Amundsen Sea is that IPL-GDGTs are likely actively synthesised at Circumpolar Deep Water depths and may be a significant source of GDGTs exported to the sedimentary record in this region. Text Amundsen Sea Antarc* Antarctic Ice Sheet Scotia Sea Southern Ocean Copernicus Publications: E-Journals Amundsen Sea Antarctic Scotia Sea Southern Ocean West Antarctic Ice Sheet |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The West Antarctic Ice Sheet (WAIS) is one of the largest potential sources of future sea-level rise, with glaciers draining the WAIS thinning at an accelerating rate over the past 40 years. Due to difficulties in calibrating palaeoceanographic proxies for the Southern Ocean, it remains difficult to assess whether similar changes have occurred earlier during the Holocene or whether there is underlying centennial to millennial scale forcing in oceanic variability. Archaeal lipid – based proxies, specifically Glycerol Dialkyl Glycerol Tetraether (GDGT) (e.g. TEX 86 and TEX 86 L ) are powerful tools for reconstructing ocean temperature, but these proxies have been shown previously to be difficult to apply to the Southern Ocean. A greater understanding of the parameters that control Southern Ocean GDGT distributions would improve the application of these biomarker proxies and thus help provide a longer-term perspective on ocean forcing of Antarctic ice sheet changes. In this study, we characterised intact polar lipid (IPL) - GDGTs, representing (recently) living archaeal population in suspended particulate matter from the Amundsen Sea and the Scotia Sea. Shifts in IPL-GDGT signatures across well-defined fronts of the Southern Ocean revealed a correlation between the physicochemical parameters of these water masses and IPL-GDGT distributions. Further analysis is required to elucidate the additional role of productivity and nutrient availability on Southern Ocean IPL-GDGT distributions. Of particular note for proxy development in the Amundsen Sea is that IPL-GDGTs are likely actively synthesised at Circumpolar Deep Water depths and may be a significant source of GDGTs exported to the sedimentary record in this region. |
format |
Text |
author |
Spencer-Jones, Charlotte L. McClymont, Erin L. Bale, Nicole J. Hopmans, Ellen C. Schouten, Stefan Müller, Juliane Abrahamsen, E. Povl Allen, Claire Bickert, Torsten Hillenbrand, Claus-Dieter Mawbey, Elaine Peck, Victoria Svalova, Aleksandra Smith, James A. |
spellingShingle |
Spencer-Jones, Charlotte L. McClymont, Erin L. Bale, Nicole J. Hopmans, Ellen C. Schouten, Stefan Müller, Juliane Abrahamsen, E. Povl Allen, Claire Bickert, Torsten Hillenbrand, Claus-Dieter Mawbey, Elaine Peck, Victoria Svalova, Aleksandra Smith, James A. Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas |
author_facet |
Spencer-Jones, Charlotte L. McClymont, Erin L. Bale, Nicole J. Hopmans, Ellen C. Schouten, Stefan Müller, Juliane Abrahamsen, E. Povl Allen, Claire Bickert, Torsten Hillenbrand, Claus-Dieter Mawbey, Elaine Peck, Victoria Svalova, Aleksandra Smith, James A. |
author_sort |
Spencer-Jones, Charlotte L. |
title |
Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas |
title_short |
Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas |
title_full |
Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas |
title_fullStr |
Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas |
title_full_unstemmed |
Archaeal Intact Polar Lipids in Polar Waters: A Comparison Between the Amundsen and Scotia Seas |
title_sort |
archaeal intact polar lipids in polar waters: a comparison between the amundsen and scotia seas |
publishDate |
2020 |
url |
https://doi.org/10.5194/bg-2020-333 https://bg.copernicus.org/preprints/bg-2020-333/ |
geographic |
Amundsen Sea Antarctic Scotia Sea Southern Ocean West Antarctic Ice Sheet |
geographic_facet |
Amundsen Sea Antarctic Scotia Sea Southern Ocean West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Scotia Sea Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Scotia Sea Southern Ocean |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2020-333 https://bg.copernicus.org/preprints/bg-2020-333/ |
op_doi |
https://doi.org/10.5194/bg-2020-333 |
_version_ |
1766376366058504192 |