DOI: 10.1175/JCLI-D-15-0733.1
Scopus记录号: 2-s2.0-84991236456
论文题名: Patterns of sea ice retreat in the transition to a seasonally ice-free arctic
作者: DeRepentigny P. ; Bruno Tremblay L. ; Newton R. ; Pfirman S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 19 起始页码: 6993
结束页码: 7008
语种: 英语
Scopus关键词: Climate models
; Climatology
; Lagrange multipliers
; Meteorology
; Ocean currents
; Sea ice
; Sea level
; Arctic Oscillation
; Atmospheric circulation
; Climate prediction
; Community climate system model
; Coupled Model Intercomparison Project
; Dynamical mechanisms
; General circulation model
; Mean sea level pressures
; Ice
英文摘要: The patterns of sea ice retreat in the Arctic Ocean are investigated using two global climate models (GCMs) that have profound differences in their large-scale mean winter atmospheric circulation and sea ice drift patterns. The Community Earth System Model Large Ensemble (CESM-LE) presents a mean sea level pressure pattern that is in general agreement with observations for the late twentieth century. The Community Climate System Model, version 4 (CCSM4), exhibits a low bias in its mean sea level pressure over the Arctic region with a deeper Icelandic low. A dynamical mechanism is presented in which large-scale mean winter atmospheric circulation has significant effect on the following September sea ice extent anomaly by influencing ice divergence in specific areas. A Lagrangian model is used to backtrack the 80°N line from the approximate time of the melt onset to its prior positions throughout the previous winter and quantify the divergence across the Pacific and Eurasian sectors of the Arctic. It is found that CCSM4 simulates more sea ice divergence in the Beaufort and Chukchi Seas and less divergence in the Eurasian seas when compared to CESM-LE, leading to a Pacific-centric sea ice retreat. On the other hand, CESM-LE shows a more symmetrical retreat between the Pacific, Eurasian, and Atlantic sectors of the Arctic. Given that a positive trend in the Arctic Oscillation (AO) index, associated with low sea level pressure anomalies in the Arctic, is a robust feature of GCMs participating in phase 5 of the Coupled Model Intercomparison Project (CMIP5), these results suggest that the sea ice retreat in the Pacific sector could be amplified during the transition to a seasonal ice cover. © 2016 American Meteorological Society. 资助项目: ArcticNet
; ONR, Office of Naval Research
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50336
Appears in Collections: 气候变化事实与影响
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作者单位: McGill University, Montreal, QC, Canada; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Barnard College, Columbia University, New York, NY, United States
Recommended Citation:
DeRepentigny P.,Bruno Tremblay L.,Newton R.,et al. Patterns of sea ice retreat in the transition to a seasonally ice-free arctic[J]. Journal of Climate,2016-01-01,29(19)