DOI: 10.1175/JCLI-D-13-00762.1
Scopus记录号: 2-s2.0-84916206654
论文题名: On the early response of the climate system to a meltwater input from Greenland
作者: Agarwal N. ; Köhl A. ; Mechoso C.R. ; Stammer D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 21 起始页码: 8276
结束页码: 8296
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Atmospheric thermodynamics
; Climate change
; Glaciers
; Surface waters
; Water
; Arctic Oscillation
; Atlantic Ocean
; Atmosphere-ocean interactions
; Freshwater
; Ice sheet
; Teleconnections
; Oceanography
; air-sea interaction
; Arctic Oscillation
; atmosphere-ocean system
; atmospheric general circulation model
; ice sheet
; North Atlantic Oscillation
; Northern Hemisphere
; oceanic general circulation model
; sea ice
; sea surface temperature
; teleconnection
; temperature anomaly
; Arctic
; Arctic Ocean
; Atlantic Ocean
; Denmark Strait
; East Greenland Current
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: The early response of the atmosphere-ocean system to meltwater runoff originating from the Greenland ice sheet is studied using a coupled atmosphere-ocean general circulation model (AOGCM). For this purpose, AOGCM ensemble simulations without and with associated ocean freshening around Greenland are compared. For freshwater perturbations initiated in northern winter, the mean response for the first three months shows the emergence of negative sea surface temperature (SST) anomalies in the Denmark Strait, in association with enhanced oceanic advection by the East Greenland Current. The response also shows negative SST anomalies in the North Atlantic associated with enhanced westerlies at the ocean surface. Additionally, the baroclinic atmospheric cyclonic circulation east of Greenland intensifies, and anticyclonic circulations with equivalent barotropic structures develop over western Europe and the North Pacific Ocean. Simulations by the atmospheric component of the AOGCM indicate that atmosphere-ocean interactions contribute significantly to enhance the response. The sensitivity of the coupled system response to the timing of freshwater perturbation is also studied. For freshwater perturbations initialized in northern summer, the response during the following winter is similar, but stronger in magnitude. In the Northern Hemisphere, the atmospheric response resembles the Arctic Oscillation (AO) mode of variability. The association between anomalies in the Denmark Strait SSTs and in the atmosphere east of Greenland is consistent with that observed during previous great salinity anomaly (GSA) events. The results obtained highlight the importance of atmosphere-ocean interaction in the early climate response to Greenland melting, the teleconnections with the North Pacific and the contribution of GSA events to North Atlantic Oscillation (NAO) variability. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51460
Appears in Collections: 气候变化事实与影响
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作者单位: Max Planck Institute for Meteorology, Hamburg, Germany; University of Hamburg, Hamburg, Germany; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, United States
Recommended Citation:
Agarwal N.,Köhl A.,Mechoso C.R.,et al. On the early response of the climate system to a meltwater input from Greenland[J]. Journal of Climate,2014-01-01,27(21)