DOI: 10.1175/JCLI-D-12-00767.1
Scopus记录号: 2-s2.0-84888024203
论文题名: Nonlinear climate responses to changes in Antarctic intermediate water
作者: Graham J.A. ; Stevens D.P. ; Heywood K.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 22 起始页码: 9175
结束页码: 9193
语种: 英语
Scopus关键词: Antarctic Circumpolar Currents
; Antarctic intermediate waters
; Climate prediction
; Climate variability
; Meridional overturning circulations
; Multi-decadal time scale
; Sea surface temperature (SST)
; Water mass
; Climatology
; Experiments
; Ocean currents
; Climate models
; Antarctic Intermediate Water
; climate change
; climate modeling
; climate prediction
; climate variation
; heat flux
; heat transfer
; potential temperature
; water mass
; Antarctic Circumpolar Current
; Atlantic Ocean
; Indian Ocean
; Pacific Ocean
; Southern Ocean
英文摘要: The global impact of changes in Antarctic Intermediate Water (AAIW) properties is demonstrated using idealized perturbation experiments in a coupled climate model. Properties of AAIW were altered between 10° and 20°S in the Atlantic, Pacific, and Indian Oceans separately. Potential temperature was changed by ±1°C, along with density-compensating changes in salinity. For each of the experiments, sea surface temperature responds to changes in AAIW when anomalies surface at higher latitudes (>30°). Anomalous sea-to-air heat fluxes leave density anomalies in the ocean, resulting in nonlinear responses to opposite-sign perturbations. In the Southern Ocean, these affect the meridional density gradient, leading to changes in Antarctic Circumpolar Current transport. The response to cooler, fresher AAIW is both greater in magnitude and significant over a larger area than that for warmer, saltier AAIW. The North Atlantic is particularly sensitive to cool, fresh perturbations, with density anomalies causing reductions in the meridional overturning circulation of up to 1 Sv (1 Sv = 106 m3 s-1). Resultant changes in meridional ocean heat transport, along with surfacing anomalies, cause basinwide changes in the surface ocean and overlying atmosphere on multidecadal time scales. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51560
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; School of Mathematics, University of East Anglia, Norwich, United Kingdom
Recommended Citation:
Graham J.A.,Stevens D.P.,Heywood K.J.. Nonlinear climate responses to changes in Antarctic intermediate water[J]. Journal of Climate,2013-01-01,26(22)