Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin
The importance of Antarctic sea ice and Southern Ocean warming has come into the focus of polar research during the last couple of decades. Especially around West Antarctica, where warm water masses approach the continent and where sea ice has declined, the distribution and evolution of sea ice play...
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Online Access: | https://doi.org/10.5194/cp-17-2305-2021 https://cp.copernicus.org/articles/17/2305/2021/ |
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ftcopernicus:oai:publications.copernicus.org:cp93172 2023-05-15T14:02:17+02:00 Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin Lamping, Nele Müller, Juliane Hefter, Jens Mollenhauer, Gesine Haas, Christian Shi, Xiaoxu Vorrath, Maria-Elena Lohmann, Gerrit Hillenbrand, Claus-Dieter 2021-10-29 application/pdf https://doi.org/10.5194/cp-17-2305-2021 https://cp.copernicus.org/articles/17/2305/2021/ eng eng doi:10.5194/cp-17-2305-2021 https://cp.copernicus.org/articles/17/2305/2021/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-17-2305-2021 2021-11-01T17:22:28Z The importance of Antarctic sea ice and Southern Ocean warming has come into the focus of polar research during the last couple of decades. Especially around West Antarctica, where warm water masses approach the continent and where sea ice has declined, the distribution and evolution of sea ice play a critical role in the stability of nearby ice shelves. Organic geochemical analyses of marine seafloor surface sediments from the Antarctic continental margin allow an evaluation of the applicability of biomarker-based sea-ice and ocean temperature reconstructions in these climate-sensitive areas. We analysed highly branched isoprenoids (HBIs), such as the sea-ice proxy IPSO 25 and phytoplankton-derived HBI-trienes, as well as phytosterols and isoprenoidal glycerol dialkyl glycerol tetraethers (GDGTs), which are established tools for the assessment of primary productivity and ocean temperatures respectively. The combination of IPSO 25 with a phytoplankton marker (i.e. the PIPSO 25 index) permits semi-quantitative sea-ice reconstructions and avoids misleading over- or underestimations of sea-ice cover. Comparisons of the PIPSO 25 -based sea-ice distribution patterns and TEX <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">86</mn><mi>L</mi></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="11pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="39f6d7bf2ebe5935ddc540125d2eae00"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2305-2021-ie00001.svg" width="11pt" height="17pt" src="cp-17-2305-2021-ie00001.png"/></svg:svg> - and RI-OH ′ -derived ocean temperatures with (1) sea-ice concentrations obtained from satellite observations and (2) instrument measurements of sea surface and subsurface temperatures corroborate the general capability of these proxies to determine oceanic key variables properly. This is further supported by model data. We also highlight specific aspects and limitations that need to be taken into account for the interpretation of such biomarker data and discuss the potential of IPSO 25 as an indicator for the former occurrence of platelet ice and/or the export of ice-shelf water. Text Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Southern Ocean West Antarctica Copernicus Publications: E-Journals Antarctic Southern Ocean The Antarctic West Antarctica Climate of the Past 17 5 2305 2326 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The importance of Antarctic sea ice and Southern Ocean warming has come into the focus of polar research during the last couple of decades. Especially around West Antarctica, where warm water masses approach the continent and where sea ice has declined, the distribution and evolution of sea ice play a critical role in the stability of nearby ice shelves. Organic geochemical analyses of marine seafloor surface sediments from the Antarctic continental margin allow an evaluation of the applicability of biomarker-based sea-ice and ocean temperature reconstructions in these climate-sensitive areas. We analysed highly branched isoprenoids (HBIs), such as the sea-ice proxy IPSO 25 and phytoplankton-derived HBI-trienes, as well as phytosterols and isoprenoidal glycerol dialkyl glycerol tetraethers (GDGTs), which are established tools for the assessment of primary productivity and ocean temperatures respectively. The combination of IPSO 25 with a phytoplankton marker (i.e. the PIPSO 25 index) permits semi-quantitative sea-ice reconstructions and avoids misleading over- or underestimations of sea-ice cover. Comparisons of the PIPSO 25 -based sea-ice distribution patterns and TEX <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">86</mn><mi>L</mi></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="11pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="39f6d7bf2ebe5935ddc540125d2eae00"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2305-2021-ie00001.svg" width="11pt" height="17pt" src="cp-17-2305-2021-ie00001.png"/></svg:svg> - and RI-OH ′ -derived ocean temperatures with (1) sea-ice concentrations obtained from satellite observations and (2) instrument measurements of sea surface and subsurface temperatures corroborate the general capability of these proxies to determine oceanic key variables properly. This is further supported by model data. We also highlight specific aspects and limitations that need to be taken into account for the interpretation of such biomarker data and discuss the potential of IPSO 25 as an indicator for the former occurrence of platelet ice and/or the export of ice-shelf water. |
format |
Text |
author |
Lamping, Nele Müller, Juliane Hefter, Jens Mollenhauer, Gesine Haas, Christian Shi, Xiaoxu Vorrath, Maria-Elena Lohmann, Gerrit Hillenbrand, Claus-Dieter |
spellingShingle |
Lamping, Nele Müller, Juliane Hefter, Jens Mollenhauer, Gesine Haas, Christian Shi, Xiaoxu Vorrath, Maria-Elena Lohmann, Gerrit Hillenbrand, Claus-Dieter Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin |
author_facet |
Lamping, Nele Müller, Juliane Hefter, Jens Mollenhauer, Gesine Haas, Christian Shi, Xiaoxu Vorrath, Maria-Elena Lohmann, Gerrit Hillenbrand, Claus-Dieter |
author_sort |
Lamping, Nele |
title |
Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin |
title_short |
Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin |
title_full |
Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin |
title_fullStr |
Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin |
title_full_unstemmed |
Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin |
title_sort |
evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the antarctic continental margin |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-2305-2021 https://cp.copernicus.org/articles/17/2305/2021/ |
geographic |
Antarctic Southern Ocean The Antarctic West Antarctica |
geographic_facet |
Antarctic Southern Ocean The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Southern Ocean West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Southern Ocean West Antarctica |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-2305-2021 https://cp.copernicus.org/articles/17/2305/2021/ |
op_doi |
https://doi.org/10.5194/cp-17-2305-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
5 |
container_start_page |
2305 |
op_container_end_page |
2326 |
_version_ |
1766272469788786688 |