Title: Teleconnection of sea surface latent heat flux and water vapor flux in East-Asia and adjacent area with summer rainfall anomaly over Chinese mainland
Abstract: Based on NCEP/NCAR reanalysis data and rainfall observation from 160 stations over Chinese mainland,optimum teleconnection patterns(the first coupled modes) of the pre-seasons(winter and spring) and homochronous(summer) sea surface latent heat flux(LHF) and water vapor flux(WVF) anomalies in East Asia and adjacent area with the summer rainfall anomaly over Chinese mainland were provided by applying SVD method.The spatio-temporal characters of the optimum coupled fields and intrinsic relations in them were investigated.The results showed that,the key sea regions of the LHF variation teleconnected to rainfall anomaly were mostly in the Kuroshio area and the Bay of Bengal(positive correlation) and the zone of the North Equatorial Current(negative correlation) in preceding winter,and in Indian-Pacific warm pool region and other sea areas alternated with band-like fields of positive and negative LHF anomalies in preceding spring and homochronous summer.They were all distinctly associated with a dipole distribution of rainfall anomaly in eastern China,and that significant regions of the rainfall variation were the South China and its anti-phased regions of the North China and the east of Southwest China,especially in spring and summer of the same year.There existed a significant 2~7 year oscillation and an evident tendency in the variations of optimum coupling modes and all modes experienced a distinct climate shift in early 1970s.As to the WVF,the key sea regions of the WVF associated with the summer rainfall anomalies were mainly in South China Sea,the Bay of Bengal and the area of Kuroshio in East China Sea,mostly corresponding to the summer rainfall variation in spring and summer of the same year with the significant regions of the middle and lower reaches of Yangtze River and the out-of-phase counter-regions of the North China and the east of Southwest China.The optimum coupling modes are striking of 2 to 8 year inter-annual variations.Except for pre-winter,those modes present obvious trends with a distinct climate shift in early 1980s.This paper suggests that the formation and its durative and seasonal evolutions of spatio-temporal configuration of the anomalous latent heat and water vapor transport over EastAsia and adjacent area is an important premise to the precipitation anomalies over Chinese mainland.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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