DOI: 10.1175/JCLI-D-11-00046.1
Scopus记录号: 2-s2.0-84856951410
论文题名: Seasonal evolutions of atmospheric response to decadal SST anomalies in the North Pacific subarctic frontal zone, observations and a coupled model simulation
作者: Taguchi B. ; Nakamura H. ; Nonaka M. ; Komori N. ; Kuwano-Yoshida A. ; Takaya K. ; Goto A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 1 起始页码: 111
结束页码: 139
语种: 英语
Scopus关键词: Decadal variability
; Fronts
; Pacific decadal oscillation
; Sea surface temperatures
; Storm tracks
; Atmospheric temperature
; Climate models
; Coastal zones
; Storms
; Climate change
; atmosphere-ocean coupling
; atmospheric general circulation model
; barotropic motion
; climate modeling
; decadal variation
; oceanic general circulation model
; Pacific Decadal Oscillation
; sea surface temperature
; seasonal variation
; storm track
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Potential impacts of pronounced decadal-scale variations in the North Pacific sea surface temperature (SST) that tend to be confined to the subarctic frontal zone (SAFZ) upon seasonally varying atmospheric states are investigated, by using 48-yr observational data and a 120-yr simulation with an ocean-atmosphere coupled general circulation model (CGCM). SST fields based on in situ observations and the ocean component of the CGCM have horizontal resolutions of 2.0° and 0.5°, respectively, which can reasonably resolve frontal SST gradient across the SAFZ. Both the observations and CGCM simulation provide a consistent picture between SST anomalies in the SAFZ yielded by its decadal-scale meridional displacement and their association with atmospheric anomalies. Correlated with SST anomalies persistent in the SAFZ from fall to winter, a coherent decadal-scale signal in the wintertime atmospheric circulation over the North Pacific starts emerging in November and develops into an equivalent barotropic anomaly pattern similar to the Pacific- North American (PNA) pattern. The PNA-like signal with the weakened (enhanced) surface Aleutian low correlated with positive (negative) SST anomalies in the SAFZ becomes strongest and most robust in January, under the feedback forcing from synoptic-scale disturbances migrating along the Pacific storm track that shifts northward (southward) in accord with the oceanic SAFZ. This PNA-like signal, however, breaks down in February, which is suggestive of a particular sensitivity of that anomaly pattern to subtle differences in the background climatological-mean state. Despite its collapse in February, the PNA-like signal recurs the next January. This subseasonal evolution of the signal suggests that the PNA-like anomaly pattern may develop as a response to the persistent SST anomalies that are maintained mainly through ocean dynamics. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52587
Appears in Collections: 气候变化事实与影响
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作者单位: Earth Simulator Center, JAMSTEC, Yokohama, Japan; Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan; Research Institute for Global Change, JAMSTEC, Yokohama, Japan; Office of International Affairs, Japan Meteorological Agency, Tokyo, Japan; Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan
Recommended Citation:
Taguchi B.,Nakamura H.,Nonaka M.,et al. Seasonal evolutions of atmospheric response to decadal SST anomalies in the North Pacific subarctic frontal zone, observations and a coupled model simulation[J]. Journal of Climate,2012-01-01,25(1)