Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea
The recent rapid decline in Arctic sea ice cover has increased the need to improve the accuracy of the sea ice component in climate models and to provide detailed long-term sea ice concentration records, which are only available via proxy data. Recently, the highly branched isoprenoid IP25, identifi...
Published in: | Quaternary Science Reviews |
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2013
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Online Access: | https://curis.ku.dk/portal/da/publications/evaluation-of-the-sea-ice-proxy-ip25-against-observational-and-diatom-proxy-data-in-the-sw-labrador-sea(52532ffd-ca45-41b2-b6f0-e5d13a63bb10).html https://doi.org/10.1016/j.quascirev.2013.02.012 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/52532ffd-ca45-41b2-b6f0-e5d13a63bb10 2024-05-12T07:59:59+00:00 Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea Weckstrom, Kaarina Masse, Guillaume Collins, Lewis G. Hanhijarvi, Sami Bouloubassi, Ioanna Sicre, Marie-Alexandrine Seidenkrantz, Marit-Solveig Schmidt, Sabine Andersen, Thorbjorn J. Andersen, Morten L. Hill, Brian Kuijpers, Antoon 2013-11-01 https://curis.ku.dk/portal/da/publications/evaluation-of-the-sea-ice-proxy-ip25-against-observational-and-diatom-proxy-data-in-the-sw-labrador-sea(52532ffd-ca45-41b2-b6f0-e5d13a63bb10).html https://doi.org/10.1016/j.quascirev.2013.02.012 eng eng info:eu-repo/semantics/restrictedAccess Weckstrom , K , Masse , G , Collins , L G , Hanhijarvi , S , Bouloubassi , I , Sicre , M-A , Seidenkrantz , M-S , Schmidt , S , Andersen , T J , Andersen , M L , Hill , B & Kuijpers , A 2013 , ' Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea ' , Quaternary Science Reviews , vol. 79 , no. SI , pp. 53-62 . https://doi.org/10.1016/j.quascirev.2013.02.012 IP25 Diatoms PIP25 Sea ice NAO Labrador Sea article 2013 ftcopenhagenunip https://doi.org/10.1016/j.quascirev.2013.02.012 2024-04-18T00:28:12Z The recent rapid decline in Arctic sea ice cover has increased the need to improve the accuracy of the sea ice component in climate models and to provide detailed long-term sea ice concentration records, which are only available via proxy data. Recently, the highly branched isoprenoid IP25, identified in marine sediments underlying seasonal sea ice, has emerged as a potential sea ice specific proxy for past sea ice cover. We tested the reliability of this biomarker as a sea ice proxy against observational sea ice data (sea ice concentrations from the global HadISST1 database) and against a more established sea ice proxy (sea ice diatom abundance in sediments) in the South-West (SW) Labrador Sea. Furthermore, our study location at the southern margin of Arctic sea ice drift provided a new environmental setting in which to further test the novel PIP25 index. Our two study sites are located North-East (NE) and South-East (SE) of Newfoundland where box cores covering the last ca 100-150 years were collected. IP25 concentrations are nearly an order of magnitude higher and sea ice diatoms more abundant in sediments from NE of Newfoundland, where sea ice prevails 2-4 months per year compared to the sediments SE of Newfoundland, where conditions are generally ice-free year round. The IP25 fluxes NE of Newfoundland agree well with multi-decadal North Atlantic Oscillation (NAO) trends in the study area, which in previous studies have been shown to affect the climatic and sea ice conditions in the region. When assessed against observational sea ice data, IP25 appears to be a more sensitive indicator of sea ice variability in this setting compared to sea ice diatoms and proved to be a robust and reliable proxy for reconstructing low-frequency variability in past sea ice concentrations. The PIP25 index results clearly differ from the observed sea ice data underlining that caution needs to be exercised when using the index in different environmental settings. (C) 2013 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Arctic Labrador Sea Newfoundland North Atlantic North Atlantic oscillation Sea ice University of Copenhagen: Research Arctic Newfoundland Quaternary Science Reviews 79 53 62 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
IP25 Diatoms PIP25 Sea ice NAO Labrador Sea |
spellingShingle |
IP25 Diatoms PIP25 Sea ice NAO Labrador Sea Weckstrom, Kaarina Masse, Guillaume Collins, Lewis G. Hanhijarvi, Sami Bouloubassi, Ioanna Sicre, Marie-Alexandrine Seidenkrantz, Marit-Solveig Schmidt, Sabine Andersen, Thorbjorn J. Andersen, Morten L. Hill, Brian Kuijpers, Antoon Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea |
topic_facet |
IP25 Diatoms PIP25 Sea ice NAO Labrador Sea |
description |
The recent rapid decline in Arctic sea ice cover has increased the need to improve the accuracy of the sea ice component in climate models and to provide detailed long-term sea ice concentration records, which are only available via proxy data. Recently, the highly branched isoprenoid IP25, identified in marine sediments underlying seasonal sea ice, has emerged as a potential sea ice specific proxy for past sea ice cover. We tested the reliability of this biomarker as a sea ice proxy against observational sea ice data (sea ice concentrations from the global HadISST1 database) and against a more established sea ice proxy (sea ice diatom abundance in sediments) in the South-West (SW) Labrador Sea. Furthermore, our study location at the southern margin of Arctic sea ice drift provided a new environmental setting in which to further test the novel PIP25 index. Our two study sites are located North-East (NE) and South-East (SE) of Newfoundland where box cores covering the last ca 100-150 years were collected. IP25 concentrations are nearly an order of magnitude higher and sea ice diatoms more abundant in sediments from NE of Newfoundland, where sea ice prevails 2-4 months per year compared to the sediments SE of Newfoundland, where conditions are generally ice-free year round. The IP25 fluxes NE of Newfoundland agree well with multi-decadal North Atlantic Oscillation (NAO) trends in the study area, which in previous studies have been shown to affect the climatic and sea ice conditions in the region. When assessed against observational sea ice data, IP25 appears to be a more sensitive indicator of sea ice variability in this setting compared to sea ice diatoms and proved to be a robust and reliable proxy for reconstructing low-frequency variability in past sea ice concentrations. The PIP25 index results clearly differ from the observed sea ice data underlining that caution needs to be exercised when using the index in different environmental settings. (C) 2013 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Weckstrom, Kaarina Masse, Guillaume Collins, Lewis G. Hanhijarvi, Sami Bouloubassi, Ioanna Sicre, Marie-Alexandrine Seidenkrantz, Marit-Solveig Schmidt, Sabine Andersen, Thorbjorn J. Andersen, Morten L. Hill, Brian Kuijpers, Antoon |
author_facet |
Weckstrom, Kaarina Masse, Guillaume Collins, Lewis G. Hanhijarvi, Sami Bouloubassi, Ioanna Sicre, Marie-Alexandrine Seidenkrantz, Marit-Solveig Schmidt, Sabine Andersen, Thorbjorn J. Andersen, Morten L. Hill, Brian Kuijpers, Antoon |
author_sort |
Weckstrom, Kaarina |
title |
Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea |
title_short |
Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea |
title_full |
Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea |
title_fullStr |
Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea |
title_full_unstemmed |
Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea |
title_sort |
evaluation of the sea ice proxy ip25 against observational and diatom proxy data in the sw labrador sea |
publishDate |
2013 |
url |
https://curis.ku.dk/portal/da/publications/evaluation-of-the-sea-ice-proxy-ip25-against-observational-and-diatom-proxy-data-in-the-sw-labrador-sea(52532ffd-ca45-41b2-b6f0-e5d13a63bb10).html https://doi.org/10.1016/j.quascirev.2013.02.012 |
geographic |
Arctic Newfoundland |
geographic_facet |
Arctic Newfoundland |
genre |
Arctic Labrador Sea Newfoundland North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
Arctic Labrador Sea Newfoundland North Atlantic North Atlantic oscillation Sea ice |
op_source |
Weckstrom , K , Masse , G , Collins , L G , Hanhijarvi , S , Bouloubassi , I , Sicre , M-A , Seidenkrantz , M-S , Schmidt , S , Andersen , T J , Andersen , M L , Hill , B & Kuijpers , A 2013 , ' Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea ' , Quaternary Science Reviews , vol. 79 , no. SI , pp. 53-62 . https://doi.org/10.1016/j.quascirev.2013.02.012 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2013.02.012 |
container_title |
Quaternary Science Reviews |
container_volume |
79 |
container_start_page |
53 |
op_container_end_page |
62 |
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1798841621159084032 |