globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2013.02.012
Scopus记录号: 2-s2.0-84885961108
论文题名:
Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea
作者: Weckström K.; Massé G.; Collins L.G.; Hanhijärvi S.; Bouloubassi I.; Sicre M.-A.; Seidenkrantz M.-S.; Schmidt S.; Andersen T.J.; Andersen M.L.; Hill B.; Kuijpers A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 79
起始页码: 53
结束页码: 62
语种: 英语
英文关键词: Diatoms ; IP25 ; Labrador Sea ; NAO ; PIP25 ; Sea ice
Scopus关键词: Diatoms ; IP<sub>25</sub> ; Labrador Sea ; NAO ; PIP<sub>25</sub> ; Atmospheric pressure ; Ocean currents ; Phytoplankton ; Sediments ; Submarine geology ; Sea ice ; climate effect ; climate modeling ; diatom ; environmental conditions ; ice cover ; ice drift ; isoprenoid ; marine sediment ; North Atlantic Oscillation ; sea ice ; Atlantic Ocean ; Canada ; Labrador Sea ; Newfoundland ; Newfoundland and Labrador ; Bacillariophyta
英文摘要: 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. © 2013 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60481
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作者单位: Department of Marine Geology and Glaciology, Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen, Denmark; LOCEAN/IPSL, UMR7159 CNRS, UPMC, IRD, MNHN, Tour 46/00, Université Pierre et Marie Curie, 4 Place Jussieu, Paris F-75252, France; TAKUVIK, UMI3376 CNRS, U.LAVAL, Université Laval, 1045 Avenue de la Médecine, G1V 0A6 Québec, Canada; Department of Environmental Sciences, University of Helsinki, P. O. Box 65 (Viikinkaari 1), FIN-00014, Finland; Laboratoire des Sciences du Climat et de l'Environnement, IPSL/CNRS/CEA, Bât. 12, avenue de la Terrasse, F-91198 Gif-sur-Yvette Cedex, France; Centre for Past Climate Studies, Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark; UMR/CNRS 5805 EPOC, OASU, Université Bordeaux 1, Avenue des Facultés, F-33405 Talence Cedex, France; Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark; National Research Council Canada (NRCC), 1 Arctic Avenue, P. O. Box 120936, St. John's, A1B 3T5 NL, Canada

Recommended Citation:
Weckström K.,Massé G.,Collins L.G.,et al. Evaluation of the sea ice proxy IP25 against observational and diatom proxy data in the SW Labrador Sea[J]. Quaternary Science Reviews,2013-01-01,79
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