DOI: 10.1007/s00382-014-2170-0
Scopus记录号: 2-s2.0-84939885391
论文题名: What controls equatorial Atlantic winds in boreal spring?
作者: Richter I. ; Behera S.K. ; Doi T. ; Taguchi B. ; Masumoto Y. ; Xie S.-P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 11 起始页码: 3091
结束页码: 3104
语种: 英语
英文关键词: Atlantic Niño
; Bjerknes feedback
; Double ITCZ
; Equatorial Atlantic
; Gill model
; Interannual variability
; Lindzen–Nigam model
; Surface winds
英文摘要: The factors controlling equatorial Atlantic winds in boreal spring are examined using both observations and general circulation model (GCM) simulations from the coupled model intercomparison phase 5. The results show that the prevailing surface easterlies flow against the attendant pressure gradient and must therefore be maintained by other terms in the momentum budget. An important contribution comes from meridional advection of zonal momentum but the dominant contribution is the vertical transport of zonal momentum from the free troposphere to the surface. This implies that surface winds are strongly influenced by conditions in the free troposphere, chiefly pressure gradients and, to a lesser extent, meridional advection. Both factors are linked to the patterns of deep convection. Applying these findings to GCM errors indicates, that, consistent with the results of previous studies, the persistent westerly surface wind bias found in most GCMs is due mostly to precipitation errors, in particular excessive precipitation south of the equator over the ocean and deficient precipitation over equatorial South America. Free tropospheric influences also dominate the interannual variability of surface winds in boreal spring. GCM experiments with prescribed climatological sea-surface temperatures (SSTs) indicate that the free tropospheric influences are mostly associated with internal atmospheric variability. Since the surface wind anomalies in boreal spring are crucial to the development of warm SST events (Atlantic Niños), the results imply that interannual variability in the region may rely far less on coupled air–sea feedbacks than is the case in the tropical Pacific. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54649
Appears in Collections: 过去全球变化的重建
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作者单位: Research Institute for Global Change, JAMSTEC, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, Japan; Application Laboratory, JAMSTEC, Yokohama, Japan; Earth Simulator Center, JAMSTEC, Yokohama, Japan; Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA, United States
Recommended Citation:
Richter I.,Behera S.K.,Doi T.,et al. What controls equatorial Atlantic winds in boreal spring?[J]. Climate Dynamics,2014-01-01,43(11)