DOI: 10.1002/2016GL068891
论文题名: Thermohaline instability and the formation of glacial North Atlantic super polynyas at the onset of Dansgaard-Oeschger warming events
作者: Vettoretti G. ; Peltier W.R.
刊名: Geophysical Research Letters
ISSN: 0094-9664
EISSN: 1944-9395
出版年: 2016
卷: 43, 期: 10 起始页码: 5336
结束页码: 5344
语种: 英语
英文关键词: Dansgaard-Oeschger
; polynya
; thermohaline
Scopus关键词: Climate models
; Glacial geology
; Ice
; Oceanography
; Stability
; Convective instabilities
; Coupled climate model
; Dansgaard-Oeschger
; Greenland ice cores
; Oscillatory behaviors
; Polynya
; Salinity gradients
; Thermohaline
; Sea ice
英文摘要: Late Quaternary rapid warming events inferred on the basis of oxygen isotopic data from Greenland ice cores are the most prominent characteristic of millennial-scale Dansgaard-Oeschger oscillations. In a coupled climate model simulation which has accurately reproduced this oscillatory behavior for the first time, we show that formation of a glacial North Atlantic super polynya characterizes the initial stage of transition from cold stadial to warm interstadial conditions. The winter polynya forms within the otherwise sea ice-covered North Atlantic as a consequence of the onset of a thermohaline convective instability beneath an extensive stadial sea ice lid. Early in the stadial period, the tendency for thermal convective instability of an extensive warm pool beneath the sea ice lid is strongly inhibited by a stabilizing vertical salinity gradient, which gradually diminishes until a thermohaline convective instability occurs that leads to polynya formation and the rapid retreat of North Atlantic sea ice cover. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84971310296&doi=10.1002%2f2016GL068891&partnerID=40&md5=1287ebcbad36d4fd5ec8ed5857cd4ae5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10627
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Physics, University of Toronto, Toronto, ON, Canada
Recommended Citation:
Vettoretti G.,Peltier W.R.. Thermohaline instability and the formation of glacial North Atlantic super polynyas at the onset of Dansgaard-Oeschger warming events[J]. Geophysical Research Letters,2016-01-01,43(10).