DOI: 10.1016/j.quascirev.2013.07.021
Scopus记录号: 2-s2.0-84885956858
论文题名: Diatoms and biomarkers evidence for major changes in sea ice conditions prior the instrumental period in Antarctic Peninsula
作者: Barbara L. ; Crosta X. ; Schmidt S. ; Massé G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 79 起始页码: 99
结束页码: 110
语种: 英语
英文关键词: Antarctic Peninsula
; Atmospheric circulation
; Diatoms
; HBI
; Last century
; Recent warming
; Sea ice
Scopus关键词: Antarctic Peninsula
; Atmospheric circulation
; Diatoms
; HBI
; Last century
; Recent warming
; Phytoplankton
; Submarine geology
; Surveys
; Sea ice
; atmosphere-ice-ocean system
; atmospheric circulation
; biomarker
; diatom
; ice retreat
; proxy climate record
; sea ice
; twentieth century
; warming
; Antarctic Peninsula
; Antarctica
; West Antarctica
; Bacillariophyta
英文摘要: The Antarctic Peninsula (AP) has been identified as one of the most rapidly warming region on Earth. Satellite monitoring currently allows for a detailed understanding of the relationship between sea ice extent and duration and atmospheric and oceanic circulations in this region. However, our knowledge on ocean-ice-atmosphere interactions is still relatively poor for the period extending beyond the last 30 years. Here, we describe environmental conditions in Northwestern and Northeastern Antarctic Peninsula areas over the last century using diatom census counts and diatom specific biomarkers (HBIs) in two marine sediment multicores (MTC-38C and -18A, respectively). Diatom census counts and HBIs show abrupt changes between 1935 and 1950, marked by ocean warming and sea ice retreat in both sides of the AP. Since 1950, inferred environmental conditions do not provide evidence for any trend related to the recent warming but demonstrate a pronounced variability on pluri-annual to decadal time scale. We propose that multi-decadal sea ice variations over the last century are forced by the recent warming, while the annual-to-decadal variability is mainly governed by synoptic and regional wind fields in relation with the position and intensity of the atmospheric low-pressure trough around the AP. However, the positive shift of the SAM since the last two decades cannot explain the regional trend observed in this study, probably due to the effect of local processes on the response of our biological proxies. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60477
Appears in Collections: 过去全球变化的重建
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作者单位: Université Bordeaux, EPOC, UMR 5805, F-33400 Talence, France; UMR-CNRS 7159 LOCEAN, Université Pierre et Marie Curie, Paris VI, Jussieu, 75252 Paris Cedex 05, France; UMI 3376 TAKUVIK, CNRS, Université Laval, 1045 Avenue de la Médecine, G1V 0A6 QC, Canada
Recommended Citation:
Barbara L.,Crosta X.,Schmidt S.,et al. Diatoms and biomarkers evidence for major changes in sea ice conditions prior the instrumental period in Antarctic Peninsula[J]. Quaternary Science Reviews,2013-01-01,79