DOI: 10.1007/s00382-014-2133-5
Scopus记录号: 2-s2.0-84897361340
论文题名: The influence of ENSO on the equatorial Atlantic precipitation through the Walker circulation in a CGCM
作者: Sasaki W. ; Doi T. ; Richards K.J. ; Masumoto Y.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 44, 期: 2017-01-02 起始页码: 191
结束页码: 202
语种: 英语
英文关键词: Coupled general circulation model
; ENSO
; Equatorial Atlantic
; ITCZ
英文摘要: The link between El Niño/Southern Oscillation (ENSO) and the equatorial Atlantic precipitation during boreal spring (March–April–May) is explored using a coupled general circulation model (CGCM). Interannual variability of the equatorial Atlantic sea surface temperature (SST) in the CGCM is excluded by nudging the modeled SST toward the climatological monthly mean of observed SST in the equatorial Atlantic, but full air–sea coupling is allowed elsewhere. It is found that the equatorial Atlantic precipitation is reduced (increased) during El Niño (La Niña) in the case where the interannual variability of the equatorial Atlantic SST is disabled. The precipitation anomalies in the equatorial Atlantic during ENSO are not strongly associated with the meridional migration of the Atlantic inter-tropical convergence zone. We find the reduced precipitation in the equatorial Atlantic during El Niño is associated with an enhanced Atlantic Walker circulation characterized by strengthened low-level easterlies and anomalous dry, downward winds over the equatorial Atlantic, while the Pacific Walker circulation is weakened. The upper-level anomalous westerlies over the equatorial Atlantic are consistent with a Matsuno–Gill-type response to heating in the eastern equatorial Pacific. Our results of the CGCM experiments suggest that changes to the Walker circulation induced by ENSO contribute significantly to changes in precipitation over the equatorial Atlantic. © 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/54690
Appears in Collections: 过去全球变化的重建
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作者单位: Center for Earth Information Science and Technology, Japan Agency for Marine Earth Science and Technology, 3173-25 Kanazawa-ku, Showa-machi, Yokohama, Kanagawa, Japan; Application Laboratory, Japan Agency for Marine Earth Science and Technology, Yokohama, Japan; International Pacific Research Center/SOEST, University of Hawaii at Manoa, Honolulu, HI, United States; Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan
Recommended Citation:
Sasaki W.,Doi T.,Richards K.J.,et al. The influence of ENSO on the equatorial Atlantic precipitation through the Walker circulation in a CGCM[J]. Climate Dynamics,2014-01-01,44(2017-01-02)