Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal

doi:10.1007/s00382-015-2867-8

CORC > 自然资源部第一海洋研究所 > 自然资源部第一海洋研究所 > 业务部门 > 海洋与气候研究中心

	Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal; Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal
	Li, Kuiping 1,2,3; Liu, Yanliang 1; Yang, Yang 1; Li, Zhi 1; Liu, Baochao 1; Xue, Liang 1; Yu, Weidong 1,4
刊名	CLIMATE DYNAMICS ; CLIMATE DYNAMICS
	2016-08 ; 2016-08
卷号	47 期号:3-4 页码:753-763
关键词	SST SST Monsoon onset Monsoon onset Intra-seasonal oscillation Intra-seasonal oscillation Bay of Bengal Bay of Bengal
ISSN号	0930-7575 ; 0930-7575
DOI	10.1007/s00382-015-2867-8 ; 10.1007/s00382-015-2867-8
英文摘要	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.; 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.
资助项目	NSFC[41005032] ; NSFC[41005032]
WOS研究方向	Meteorology & Atmospheric Sciences ; Meteorology & Atmospheric Sciences
语种	英语 ; 英语
出版者	SPRINGER ; SPRINGER
WOS记录号	WOS:000382111300005 ; WOS:000382111300005
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3381]
专题	业务部门_海洋与气候研究中心
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
推荐引用方式 GB/T 7714	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, Possible role of pre-monsoon sea surface warming in driving the summer monsoon onset over the Bay of Bengal[J]. CLIMATE DYNAMICS, CLIMATE DYNAMICS,2016, 2016,47, 47(3-4):753-763, 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.