Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula
Organic geochemical and micropaleontological analyses of surface sediments collected in the southern Drake Passage and the Bransfield Strait, Western Antarctic Peninsula, enable a proxy-based reconstruction of recent sea ice conditions in this climate-sensitive area. We study the distribution of the...
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ftcopernicus:oai:publications.copernicus.org:bg73599 2023-05-15T13:35:05+02:00 Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula Vorrath, Maria-Elena Müller, Juliane Esper, Oliver Mollenhauer, Gesine Haas, Christian Schefuß, Enno Fahl, Kirsten 2019-08-02 application/pdf https://doi.org/10.5194/bg-16-2961-2019 https://www.biogeosciences.net/16/2961/2019/ eng eng doi:10.5194/bg-16-2961-2019 https://www.biogeosciences.net/16/2961/2019/ eISSN: 1726-4189 Text 2019 ftcopernicus https://doi.org/10.5194/bg-16-2961-2019 2019-12-24T09:48:45Z Organic geochemical and micropaleontological analyses of surface sediments collected in the southern Drake Passage and the Bransfield Strait, Western Antarctic Peninsula, enable a proxy-based reconstruction of recent sea ice conditions in this climate-sensitive area. We study the distribution of the sea ice biomarker IPSO 25 , and biomarkers of open marine environments such as more unsaturated highly branched isoprenoid alkenes and phytosterols. Comparison of the sedimentary distribution of these biomarker lipids with sea ice data obtained from satellite observations and diatom-based sea ice estimates provide for an evaluation of the suitability of these biomarkers to reflect recent sea surface conditions. The distribution of IPSO 25 supports earlier suggestions that the source diatom seems to be common in near-coastal environments characterized by annually recurring sea ice cover, while the distribution of the other biomarkers is highly variable. Offsets between sea ice estimates deduced from the abundance of biomarkers and satellite-based sea ice data are attributed to the different time intervals recorded within the sediments and the instrumental records from the study area, which experienced rapid environmental changes during the past 100 years. To distinguish areas characterized by permanently ice-free conditions, seasonal sea ice cover and extended sea ice cover, we apply the concept of the PIP 25 index from the Arctic Ocean to our data and introduce the term PIPSO 25 as a potential sea ice proxy. While the trends in PIPSO 25 are generally consistent with satellite sea ice data and winter sea ice concentrations in the study area estimated by diatom transfer functions, more studies on the environmental significance of IPSO 25 as a Southern Ocean sea ice proxy are needed before this biomarker can be applied for semi-quantitative sea ice reconstructions. Text Antarc* Antarctic Antarctic Peninsula Arctic Arctic Ocean Bransfield Strait Drake Passage Sea ice Southern Ocean Copernicus Publications: E-Journals Antarctic Antarctic Peninsula Arctic Arctic Ocean Bransfield Strait Drake Passage Southern Ocean Biogeosciences 16 15 2961 2981 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Organic geochemical and micropaleontological analyses of surface sediments collected in the southern Drake Passage and the Bransfield Strait, Western Antarctic Peninsula, enable a proxy-based reconstruction of recent sea ice conditions in this climate-sensitive area. We study the distribution of the sea ice biomarker IPSO 25 , and biomarkers of open marine environments such as more unsaturated highly branched isoprenoid alkenes and phytosterols. Comparison of the sedimentary distribution of these biomarker lipids with sea ice data obtained from satellite observations and diatom-based sea ice estimates provide for an evaluation of the suitability of these biomarkers to reflect recent sea surface conditions. The distribution of IPSO 25 supports earlier suggestions that the source diatom seems to be common in near-coastal environments characterized by annually recurring sea ice cover, while the distribution of the other biomarkers is highly variable. Offsets between sea ice estimates deduced from the abundance of biomarkers and satellite-based sea ice data are attributed to the different time intervals recorded within the sediments and the instrumental records from the study area, which experienced rapid environmental changes during the past 100 years. To distinguish areas characterized by permanently ice-free conditions, seasonal sea ice cover and extended sea ice cover, we apply the concept of the PIP 25 index from the Arctic Ocean to our data and introduce the term PIPSO 25 as a potential sea ice proxy. While the trends in PIPSO 25 are generally consistent with satellite sea ice data and winter sea ice concentrations in the study area estimated by diatom transfer functions, more studies on the environmental significance of IPSO 25 as a Southern Ocean sea ice proxy are needed before this biomarker can be applied for semi-quantitative sea ice reconstructions. |
format |
Text |
author |
Vorrath, Maria-Elena Müller, Juliane Esper, Oliver Mollenhauer, Gesine Haas, Christian Schefuß, Enno Fahl, Kirsten |
spellingShingle |
Vorrath, Maria-Elena Müller, Juliane Esper, Oliver Mollenhauer, Gesine Haas, Christian Schefuß, Enno Fahl, Kirsten Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula |
author_facet |
Vorrath, Maria-Elena Müller, Juliane Esper, Oliver Mollenhauer, Gesine Haas, Christian Schefuß, Enno Fahl, Kirsten |
author_sort |
Vorrath, Maria-Elena |
title |
Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula |
title_short |
Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula |
title_full |
Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula |
title_fullStr |
Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula |
title_full_unstemmed |
Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula |
title_sort |
highly branched isoprenoids for southern ocean sea ice reconstructions: a pilot study from the western antarctic peninsula |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-2961-2019 https://www.biogeosciences.net/16/2961/2019/ |
geographic |
Antarctic Antarctic Peninsula Arctic Arctic Ocean Bransfield Strait Drake Passage Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Arctic Arctic Ocean Bransfield Strait Drake Passage Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula Arctic Arctic Ocean Bransfield Strait Drake Passage Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Arctic Arctic Ocean Bransfield Strait Drake Passage Sea ice Southern Ocean |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-16-2961-2019 https://www.biogeosciences.net/16/2961/2019/ |
op_doi |
https://doi.org/10.5194/bg-16-2961-2019 |
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Biogeosciences |
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16 |
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15 |
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2961 |
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2981 |
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1766060822832873472 |