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Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal
Li, Kuiping1,2,3; Liu, Yanliang1; Yang, Yang1; Li, Zhi1; Liu, Baochao1; Xue, Liang1; Yu, Weidong1,4
2016-08-01
发表期刊CLIMATE DYNAMICS
卷号47期号:3-4页码:753-763
文章类型Article
摘要Sea surface temperature (SST) reaches its annual maximum just before the summer monsoon onset and collapses soon after in the central areas of the Bay of Bengal (BoB). Here, the impact of the peak in the pre-monsoon SST on triggering the earliest monsoon onset in the BoB is investigated, with a focus on the role they play in driving the first-branch northward-propagating intra-seasonal oscillations (FNISOs) over the equatorial Eastern Indian Ocean (EIO). During the calm pre-monsoon period, sea surface warming in the BoB could increase the surface equivalent potential temperature (theta(e)) in several ways. Firstly, warming of the sea surface heats the surface air through sensible heating, which forces the air temperature to follow the SST. The elevated air surface temperature accounts for 30 % of the surface theta(e) growth. Furthermore, the elevated air temperature raises the water vapor capacity of the surface air to accommodate more water vapor. Constrained by the observation that the surface relative humidity is maintained nearly constant during the monsoon transition period, the surface specific humidity exhibits a significant increase, according to the Clausius-Clapeyron relationship. Budget analysis indicates that the additional moisture is primarily obtained from sea surface evaporation, which also exhibits a weak increasing trend due to the sea surface warming. In this way, it contributes about 70 % to the surface theta(e) growth. The rapid SST increase during the pre-monsoon period preconditions the summer monsoon onset over the BoB through its contributions to significantly increase the surface theta(e), which eventually establishes the meridional asymmetry of the atmospheric convective instability in the EIO. The pre-established greater convective instability leads to the FNISO convections, and the summer monsoon is triggered in the BoB region.
关键词Sst Monsoon Onset Intra-seasonal Oscillation Bay Of Bengal
DOI10.1007/s00382-015-2867-8
收录类别SCI
语种英语
WOS记录号WOS:000382111300005
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/135835
专题海洋环流与波动重点实验室
作者单位1.SOA, Inst Oceanog 1, Ctr Ocean & Climate Res, Qingdao 266061, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 10049, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao 266071, Peoples R China
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Li, Kuiping,Liu, Yanliang,Yang, Yang,et al. Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal[J]. CLIMATE DYNAMICS,2016,47(3-4):753-763.
APA Li, Kuiping.,Liu, Yanliang.,Yang, Yang.,Li, Zhi.,Liu, Baochao.,...&Yu, Weidong.(2016).Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal.CLIMATE DYNAMICS,47(3-4),753-763.
MLA Li, Kuiping,et al."Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal".CLIMATE DYNAMICS 47.3-4(2016):753-763.
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