Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study
In the last decades, changing climate conditions have had a severe impact on sea ice at the western Antarctic Peninsula (WAP), an area rapidly transforming under global warming. To study the development of spring sea ice and environmental conditions in the pre-satellite era we investigated three sho...
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ftdoajarticles:oai:doaj.org/article:496c9d5894f4479ab4085dd37868d58e 2023-05-15T13:58:39+02:00 Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study M.-E. Vorrath J. Müller L. Rebolledo P. Cárdenas X. Shi O. Esper T. Opel W. Geibert P. Muñoz C. Haas G. Kuhn C. B. Lange G. Lohmann G. Mollenhauer 2020-12-01T00:00:00Z https://doi.org/10.5194/cp-16-2459-2020 https://doaj.org/article/496c9d5894f4479ab4085dd37868d58e EN eng Copernicus Publications https://cp.copernicus.org/articles/16/2459/2020/cp-16-2459-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-2459-2020 1814-9324 1814-9332 https://doaj.org/article/496c9d5894f4479ab4085dd37868d58e Climate of the Past, Vol 16, Pp 2459-2483 (2020) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.5194/cp-16-2459-2020 2022-12-31T04:24:20Z In the last decades, changing climate conditions have had a severe impact on sea ice at the western Antarctic Peninsula (WAP), an area rapidly transforming under global warming. To study the development of spring sea ice and environmental conditions in the pre-satellite era we investigated three short marine sediment cores for their biomarker inventory with a particular focus on the sea ice proxy IPSO 25 and micropaleontological proxies. The core sites are located in the Bransfield Strait in shelf to deep basin areas characterized by a complex oceanographic frontal system, coastal influence and sensitivity to large-scale atmospheric circulation patterns. We analyzed geochemical bulk parameters, biomarkers (highly branched isoprenoids, glycerol dialkyl glycerol tetraethers, sterols), and diatom abundances and diversity over the past 240 years and compared them to observational data, sedimentary and ice core climate archives, and results from numerical models. Based on biomarker results we identified four different environmental units characterized by (A) low sea ice cover and high ocean temperatures, (B) moderate sea ice cover with decreasing ocean temperatures, (C) high but variable sea ice cover during intervals of lower ocean temperatures, and (D) extended sea ice cover coincident with a rapid ocean warming. While IPSO 25 concentrations correspond quite well to satellite sea ice observations for the past 40 years, we note discrepancies between the biomarker-based sea ice estimates, the long-term model output for the past 240 years, ice core records, and reconstructed atmospheric circulation patterns such as the El Niño–Southern Oscillation (ENSO) and Southern Annular Mode (SAM). We propose that the sea ice biomarker proxies IPSO 25 and PIPSO 25 are not linearly related to sea ice cover, and, additionally, each core site reflects specific local environmental conditions. High IPSO 25 and PIPSO 25 values may not be directly interpreted as referring to high spring sea ice cover because variable sea ice conditions ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bransfield Strait ice core Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Bransfield Strait Climate of the Past 16 6 2459 2483 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M.-E. Vorrath J. Müller L. Rebolledo P. Cárdenas X. Shi O. Esper T. Opel W. Geibert P. Muñoz C. Haas G. Kuhn C. B. Lange G. Lohmann G. Mollenhauer Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
In the last decades, changing climate conditions have had a severe impact on sea ice at the western Antarctic Peninsula (WAP), an area rapidly transforming under global warming. To study the development of spring sea ice and environmental conditions in the pre-satellite era we investigated three short marine sediment cores for their biomarker inventory with a particular focus on the sea ice proxy IPSO 25 and micropaleontological proxies. The core sites are located in the Bransfield Strait in shelf to deep basin areas characterized by a complex oceanographic frontal system, coastal influence and sensitivity to large-scale atmospheric circulation patterns. We analyzed geochemical bulk parameters, biomarkers (highly branched isoprenoids, glycerol dialkyl glycerol tetraethers, sterols), and diatom abundances and diversity over the past 240 years and compared them to observational data, sedimentary and ice core climate archives, and results from numerical models. Based on biomarker results we identified four different environmental units characterized by (A) low sea ice cover and high ocean temperatures, (B) moderate sea ice cover with decreasing ocean temperatures, (C) high but variable sea ice cover during intervals of lower ocean temperatures, and (D) extended sea ice cover coincident with a rapid ocean warming. While IPSO 25 concentrations correspond quite well to satellite sea ice observations for the past 40 years, we note discrepancies between the biomarker-based sea ice estimates, the long-term model output for the past 240 years, ice core records, and reconstructed atmospheric circulation patterns such as the El Niño–Southern Oscillation (ENSO) and Southern Annular Mode (SAM). We propose that the sea ice biomarker proxies IPSO 25 and PIPSO 25 are not linearly related to sea ice cover, and, additionally, each core site reflects specific local environmental conditions. High IPSO 25 and PIPSO 25 values may not be directly interpreted as referring to high spring sea ice cover because variable sea ice conditions ... |
format |
Article in Journal/Newspaper |
author |
M.-E. Vorrath J. Müller L. Rebolledo P. Cárdenas X. Shi O. Esper T. Opel W. Geibert P. Muñoz C. Haas G. Kuhn C. B. Lange G. Lohmann G. Mollenhauer |
author_facet |
M.-E. Vorrath J. Müller L. Rebolledo P. Cárdenas X. Shi O. Esper T. Opel W. Geibert P. Muñoz C. Haas G. Kuhn C. B. Lange G. Lohmann G. Mollenhauer |
author_sort |
M.-E. Vorrath |
title |
Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study |
title_short |
Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study |
title_full |
Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study |
title_fullStr |
Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study |
title_full_unstemmed |
Sea ice dynamics in the Bransfield Strait, Antarctic Peninsula, during the past 240 years: a multi-proxy intercomparison study |
title_sort |
sea ice dynamics in the bransfield strait, antarctic peninsula, during the past 240 years: a multi-proxy intercomparison study |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-2459-2020 https://doaj.org/article/496c9d5894f4479ab4085dd37868d58e |
geographic |
Antarctic Antarctic Peninsula Bransfield Strait |
geographic_facet |
Antarctic Antarctic Peninsula Bransfield Strait |
genre |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait ice core Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait ice core Sea ice |
op_source |
Climate of the Past, Vol 16, Pp 2459-2483 (2020) |
op_relation |
https://cp.copernicus.org/articles/16/2459/2020/cp-16-2459-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-2459-2020 1814-9324 1814-9332 https://doaj.org/article/496c9d5894f4479ab4085dd37868d58e |
op_doi |
https://doi.org/10.5194/cp-16-2459-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
6 |
container_start_page |
2459 |
op_container_end_page |
2483 |
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1766267002305904640 |