DOI: 10.1007/s00382-014-2439-3
Scopus记录号: 2-s2.0-84943814835
论文题名: Influences of ENSO on the vertical coupling of atmospheric circulation during the onset of South Asian summer monsoon
作者: Liu B. ; Wu G. ; Ren R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-07-08 起始页码: 1859
结束页码: 1875
语种: 英语
英文关键词: ENSO
; Forced convection
; Inertial instability
; South Asian high
; South Asian summer monsoon onset
英文摘要: Based on multiple sources of atmospheric and oceanic data, this study performs a series of composite analysis of the South Asian summer monsoon (SASM) onset against ENSO events, and indicates that warm/cold ENSO events induce later/earlier onset of the SASM by modulating the vertical coupling of the upper- and lower-level circulation over the South Asia. Specifically, during the monsoon onset of Bay of Bengal (BOB), the ENSO-induced convection anomalies over the southern Philippines can modulate the position of South Asian high (SAH) in late April in the upper troposphere, which evolves to affect the monsoon onset convection by changing the upper divergence-pumping effect. In the lower troposphere, ENSO induces an anomalous zonal gradient of sea surface temperature (SST) over the Indian-western Pacific Ocean to alter the barotropic instability which further affects the formation of BOB monsoon onset convection. During the Indian summer monsoon onset, the anomalous convection over northeastern BOB and Indochina Peninsula in late May act to change the SAH position and its relevant upper divergence-pumping over the Arabian Sea (AS). Meanwhile, the Indian monsoon onset convection is also modulated by the ENSO-induced changes in intensity of the inertial instability and the forced convection over the AS, which are related to an ENSO-induced anomalous cross-equatorial SST gradient and zonally asymmetric meridional gradient of sea level pressure, and an anomalous westerly over the central AS in the lower troposphere. Results demonstrate that during the BOB and India monsoon onset, the influences of ENSO on the upper circulation are similar, but are distinctly different on the lower-level circulation. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: China Postdoctoral Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53998
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Liu B.,Wu G.,Ren R.. Influences of ENSO on the vertical coupling of atmospheric circulation during the onset of South Asian summer monsoon[J]. Climate Dynamics,2015-01-01,45(2017-07-08)