DOI: 10.1175/JCLI-D-15-0586.1
Scopus记录号: 2-s2.0-84983493348
论文题名: Seasonal atmospheric responses to reduced arctic sea ice in an ensemble of coupled model simulations
作者: Semmler T. ; Stulic L. ; Jung T. ; Tilinina N. ; Campos C. ; Gulev S. ; Koracin D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 16 起始页码: 5893
结束页码: 5913
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate models
; Evaporation
; Fighter aircraft
; Greenhouse gases
; Ice control
; Sea ice
; Storms
; Surface properties
; Atmospheric circulation
; Atmospheric response
; Coupled climate model
; Low pressure systems
; Meridional temperature gradient
; Near surface temperature
; Numerical experimentations
; Ocean stratification
; Ice
英文摘要: Arctic sea ice decline is expected to continue throughout the twenty-first century as a result of increased greenhouse gas concentrations. Here we investigate the impact of a strong Arctic sea ice decline on the atmospheric circulation and low pressure systems in the Northern Hemisphere through numerical experimentation with a coupled climate model. More specifically, a large ensemble of 1-yr-long integrations, initialized on 1 June with Arctic sea ice thickness artificially reduced by 80%, is compared to corresponding unperturbed control experiments. The sensitivity experiment shows an ice-free Arctic from July to October; during autumn the largest near-surface temperature increase of about 15 K is found in the central Arctic, which goes along with a reduced meridional temperature gradient, a decreased jet stream, and a southward shifted Northern Hemisphere storm track; and the near-surface temperature response in winter and spring reduces substantially due to relatively fast sea ice growth during the freezing season. Changes in the maximum Eady growth rate are generally below 5% and hardly significant, with reduced vertical wind shear and reduced vertical stability counteracting each other. The reduced vertical wind shear manifests itself in a decrease of synoptic activity by up to 10% and shallower cyclones while the reduced vertical stability along with stronger diabatic heating due to more available moisture may be responsible for the stronger deepening rates and thus faster cyclone development once a cyclone starts to form. Furthermore, precipitation minus evaporation decreases over the Arctic because the increase in evaporation outweighs that for precipitation, with implications for the ocean stratification and hence ocean circulation. © 2016 American Meteorological Society. 资助项目: RSF, Russian Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50309
Appears in Collections: 气候变化事实与影响
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作者单位: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; University of Bremen, Bremen, Germany; P. P. Shirshov Institute of Oceanology, Moscow, Russian Federation; Physics Department, Faculty of Science, University of Split, Split, Croatia; Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States
Recommended Citation:
Semmler T.,Stulic L.,Jung T.,et al. Seasonal atmospheric responses to reduced arctic sea ice in an ensemble of coupled model simulations[J]. Journal of Climate,2016-01-01,29(16)