Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean
Organic geochemical and micropaleontological analyses of surface sediments collected in the southern Drake Passage and the Bransfield Strait, Antarctic Peninsula, enable a proxy-based reconstruction of recent sea ice conditions in this climate sensitive area. The distribution of the sea ice biomarke...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.897165 2023-05-15T14:04:56+02:00 Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean Vorrath, Maria-Elena Müller, Juliane Esper, Oliver Mollenhauer, Gesine Haas, Christian Schefuß, Enno Fahl, Kirsten MEDIAN LATITUDE: -61.469011 * MEDIAN LONGITUDE: -60.879841 * SOUTH-BOUND LATITUDE: -63.757000 * WEST-BOUND LONGITUDE: -66.096170 * NORTH-BOUND LATITUDE: -58.869000 * EAST-BOUND LONGITUDE: -55.647000 * DATE/TIME START: 1987-11-14T01:21:00 * DATE/TIME END: 2016-03-16T00:24:00 2019-01-09 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.897165 https://doi.org/10.1594/PANGAEA.897165 en eng PANGAEA Vorrath, Maria-Elena; Müller, Juliane; Esper, Oliver; Mollenhauer, Gesine; Haas, Christian; Schefuß, Enno; Fahl, Kirsten (2019): Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula. Biogeosciences, 16(15), 2961-2981, https://doi.org/10.5194/bg-16-2961-2019 https://doi.pangaea.de/10.1594/PANGAEA.897165 https://doi.org/10.1594/PANGAEA.897165 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Dataset 2019 ftpangaea https://doi.org/10.1594/PANGAEA.897165 https://doi.org/10.5194/bg-16-2961-2019 2023-01-20T07:34:16Z Organic geochemical and micropaleontological analyses of surface sediments collected in the southern Drake Passage and the Bransfield Strait, Antarctic Peninsula, enable a proxy-based reconstruction of recent sea ice conditions in this climate sensitive area. The distribution of the sea ice biomarker IPSO25 supports earlier suggestions that the source diatoms seem to be common in near-coastal environments characterized by an annually recurring sea ice cover. We here propose and evaluate the combination of IPSO25 with a more unsaturated highly branched isoprenoid alkene and phytosterols and introduce the PIPSO25 index as a potentially semi-quantitative sea ice proxy. This organic geochemical approach is complemented with diatom data. PIPSO25 sea ice estimates are used to discriminate between areas characterized by permanently ice-free conditions, seasonal sea ice cover and extended sea ice cover. These trends are consistent with satellite sea ice data and winter sea ice concentrations estimated by diatom transfer functions. Minor offsets between proxy-based 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. Dataset Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Sea ice Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Southern Ocean ENVELOPE(-66.096170,-55.647000,-58.869000,-63.757000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Organic geochemical and micropaleontological analyses of surface sediments collected in the southern Drake Passage and the Bransfield Strait, Antarctic Peninsula, enable a proxy-based reconstruction of recent sea ice conditions in this climate sensitive area. The distribution of the sea ice biomarker IPSO25 supports earlier suggestions that the source diatoms seem to be common in near-coastal environments characterized by an annually recurring sea ice cover. We here propose and evaluate the combination of IPSO25 with a more unsaturated highly branched isoprenoid alkene and phytosterols and introduce the PIPSO25 index as a potentially semi-quantitative sea ice proxy. This organic geochemical approach is complemented with diatom data. PIPSO25 sea ice estimates are used to discriminate between areas characterized by permanently ice-free conditions, seasonal sea ice cover and extended sea ice cover. These trends are consistent with satellite sea ice data and winter sea ice concentrations estimated by diatom transfer functions. Minor offsets between proxy-based 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. |
format |
Dataset |
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, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean |
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, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean |
title_short |
Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean |
title_full |
Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean |
title_fullStr |
Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean |
title_full_unstemmed |
Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean |
title_sort |
highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from southern ocean |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.897165 https://doi.org/10.1594/PANGAEA.897165 |
op_coverage |
MEDIAN LATITUDE: -61.469011 * MEDIAN LONGITUDE: -60.879841 * SOUTH-BOUND LATITUDE: -63.757000 * WEST-BOUND LONGITUDE: -66.096170 * NORTH-BOUND LATITUDE: -58.869000 * EAST-BOUND LONGITUDE: -55.647000 * DATE/TIME START: 1987-11-14T01:21:00 * DATE/TIME END: 2016-03-16T00:24:00 |
long_lat |
ENVELOPE(-66.096170,-55.647000,-58.869000,-63.757000) |
geographic |
Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Sea ice Southern Ocean |
op_relation |
Vorrath, Maria-Elena; Müller, Juliane; Esper, Oliver; Mollenhauer, Gesine; Haas, Christian; Schefuß, Enno; Fahl, Kirsten (2019): Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula. Biogeosciences, 16(15), 2961-2981, https://doi.org/10.5194/bg-16-2961-2019 https://doi.pangaea.de/10.1594/PANGAEA.897165 https://doi.org/10.1594/PANGAEA.897165 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.897165 https://doi.org/10.5194/bg-16-2961-2019 |
_version_ |
1766276408172085248 |