DOI: 10.1175/JCLI-D-17-0802.1
Scopus记录号: 2-s2.0-85048203279
论文题名: Large changes in sea ice triggered by small changes in Atlantic water temperature
作者: Jensen M.F. ; Nisancioglu K.H. ; Spall M.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 12 起始页码: 4847
结束页码: 4863
语种: 英语
英文关键词: Arctic
; General circulation models
; Ocean
; Ocean dynamics
; Paleoclimate
; Sea ice
Scopus关键词: Mooring
; Oceanography
; Temperature
; Arctic
; General circulation model
; Ocean
; Ocean dynamics
; Paleoclimates
; Sea ice
; climate effect
; general circulation model
; ice cover
; ice retreat
; paleoclimate
; salinity
; sea ice
; warming
; water temperature
; Arctic
; Arctic Ocean
; Atlantic Ocean
; Greenland
; Scotland
; United Kingdom
英文摘要: The sensitivity of sea ice to the temperature of inflowing Atlantic water across theGreenland-Scotland Ridge is investigated using an eddy-resolving configuration of the Massachusetts Institute of Technology General Circulation Model with idealized topography. During the last glacial period, when climate on Greenland is known to have been extremely unstable, sea ice is thought to have covered the Nordic seas. The dramatic excursions in climate during this period, seen as large abrupt warming events on Greenland and known as Dansgaard-Oeschger (DO) events, are proposed to have been caused by a rapid retreat of Nordic seas sea ice. Here, we show that a full sea ice cover and Arctic-like stratification can exist in the Nordic seas given a sufficiently cold Atlantic inflow and corresponding low transport of heat across the Greenland-Scotland Ridge. Once sea ice is established, continued sea ice formation and melt efficiently freshens the surface ocean and makes the deeper layers more saline. This creates a strong salinity stratification in the Nordic seas, similar to today's Arctic Ocean, with a cold fresh surface layer protecting the overlying sea ice from the warm Atlantic water below. There is a nonlinear response in Nordic seas sea ice to Atlantic water temperature with simulated large abrupt changes in sea ice given small changes in inflowing temperature. This suggests that the DO events were more likely to have occurred during periods of reduced warm Atlantic water inflow to the Nordic seas. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111516
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway; Department of Geosciences, University of Oslo, Center for Earth Evolution and Dynamics, Oslo, Norway; Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
Jensen M.F.,Nisancioglu K.H.,Spall M.A.. Large changes in sea ice triggered by small changes in Atlantic water temperature[J]. Journal of Climate,2018-01-01,31(12)