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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fttriple:oai:gotriple.eu:oai:doaj.org/article:a5657180e71341ee99f34135644ffdb7 2023-05-15T13:32:52+02:00 Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin N. Lamping J. Müller J. Hefter G. Mollenhauer C. Haas X. Shi M.-E. Vorrath G. Lohmann C.-D. Hillenbrand 2021-10-01 https://doi.org/10.5194/cp-17-2305-2021 https://cp.copernicus.org/articles/17/2305/2021/cp-17-2305-2021.pdf https://doaj.org/article/a5657180e71341ee99f34135644ffdb7 en eng Copernicus Publications doi:10.5194/cp-17-2305-2021 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/2305/2021/cp-17-2305-2021.pdf https://doaj.org/article/a5657180e71341ee99f34135644ffdb7 undefined Climate of the Past, Vol 17, Pp 2305-2326 (2021) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/cp-17-2305-2021 2023-01-22T17:50:54Z 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 IPSO25 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 IPSO25 with a phytoplankton marker (i.e. the PIPSO25 index) permits semi-quantitative sea-ice reconstructions and avoids misleading over- or underestimations of sea-ice cover. Comparisons of the PIPSO25-based sea-ice distribution patterns and TEX86L- 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 IPSO25 as an indicator for the former occurrence of platelet ice and/or the export of ice-shelf water. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Southern Ocean West Antarctica Unknown Antarctic Southern Ocean The Antarctic West Antarctica Climate of the Past 17 5 2305 2326 |
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geo envir N. Lamping J. Müller J. Hefter G. Mollenhauer C. Haas X. Shi M.-E. Vorrath G. Lohmann C.-D. Hillenbrand Evaluation of lipid biomarkers as proxies for sea ice and ocean temperatures along the Antarctic continental margin |
topic_facet |
geo envir |
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 IPSO25 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 IPSO25 with a phytoplankton marker (i.e. the PIPSO25 index) permits semi-quantitative sea-ice reconstructions and avoids misleading over- or underestimations of sea-ice cover. Comparisons of the PIPSO25-based sea-ice distribution patterns and TEX86L- 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 IPSO25 as an indicator for the former occurrence of platelet ice and/or the export of ice-shelf water. |
format |
Article in Journal/Newspaper |
author |
N. Lamping J. Müller J. Hefter G. Mollenhauer C. Haas X. Shi M.-E. Vorrath G. Lohmann C.-D. Hillenbrand |
author_facet |
N. Lamping J. Müller J. Hefter G. Mollenhauer C. Haas X. Shi M.-E. Vorrath G. Lohmann C.-D. Hillenbrand |
author_sort |
N. Lamping |
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 |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-2305-2021 https://cp.copernicus.org/articles/17/2305/2021/cp-17-2305-2021.pdf https://doaj.org/article/a5657180e71341ee99f34135644ffdb7 |
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 |
Climate of the Past, Vol 17, Pp 2305-2326 (2021) |
op_relation |
doi:10.5194/cp-17-2305-2021 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/2305/2021/cp-17-2305-2021.pdf https://doaj.org/article/a5657180e71341ee99f34135644ffdb7 |
op_rights |
undefined |
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_ |
1766036656065871872 |