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Tracing changes in atmospheric moisture supply to the drying Southwest China
Zhang, Chi1; Tang, Qiuhong1,5; Chen, Deliang2; Li, Laifang3; Liu, Xingcai1; Cui, Huijuan4
2017-09-05
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
Volume17Issue:17Pages:10383-10393
Corresponding AuthorTang, Qiuhong(tangqh@igsnrr.ac.cn)
AbstractPrecipitation over Southwest China (SWC) significantly decreased during 1979-2013. The months from July to September (JAS) contributed the most to the decrease in precipitation. By tracing moisture sources of JAS precipitation over the SWC region, it is found that most moisture originates in regions from the northern Indian Ocean to SWC and from South China Sea to SWC. The major moisture contributing area is divided into an extended west region, SWC, and an extended east region. The extended west region is mainly influenced by the South Asian summer monsoon (SASM) and the westerlies, while the extended east region is mainly influenced by the East Asian summer monsoon (EASM). The extended west, SWC, and extended east regions contribute 48.2, 15.5, and 24.5% of the moisture for the SWC precipitation, respectively. Moisture supply from the extended west region decreased at a rate of -7.9 mm month(-1) decade(-1), whereas that from the extended east increased at a rate of 1.4 mm month(-1) decade(-1), resulting in an overall decrease in moisture supply. Further analysis reveals that the decline of JAS precipitation is mainly caused by change in the seasonal-mean component rather than the transient component of the moisture transport over the SWC region. In addition, the dynamic processes (i.e., changes in wind) rather than the thermodynamic processes (i.e., changes in specific humidity) are dominant in affecting the seasonal-mean moisture transport. A prevailing easterly anomaly of moisture transport that weakened moisture supply from the Indian Ocean is to a large extent responsible for the precipitation decrease over the SWC region.
DOI10.5194/acp-17-10383-2017
WOS KeywordDATA ASSIMILATION SYSTEM ; GLOBAL WATER CYCLE ; TIBETAN PLATEAU ; INTERANNUAL VARIABILITY ; LAGRANGIAN ANALYSIS ; RAINFALL EVENTS ; ERA-INTERIM ; AUGUST 2002 ; PRECIPITATION ; DROUGHT
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41425002] ; Chinese Academy of Sciences[ZDRW-ZS-2016-6-4] ; National Youth Top-notch Talent Support Program in China ; Swedish VR ; STINT ; BECC ; MERGE ; SNIC through S-CMIP
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences ; National Youth Top-notch Talent Support Program in China ; Swedish VR ; STINT ; BECC ; MERGE ; SNIC through S-CMIP
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000409247300001
PublisherCOPERNICUS GESELLSCHAFT MBH
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/61790
Collection中国科学院地理科学与资源研究所
Corresponding AuthorTang, Qiuhong
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing, Peoples R China
2.Univ Gothenburg, Dept Earth Sci, Reg Climate Grp, Gothenburg, Sweden
3.Duke Univ, Nicholas Sch Environm, Earth & Ocean Sci, Durham, NC 27706 USA
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Chi,Tang, Qiuhong,Chen, Deliang,et al. Tracing changes in atmospheric moisture supply to the drying Southwest China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(17):10383-10393.
APA Zhang, Chi,Tang, Qiuhong,Chen, Deliang,Li, Laifang,Liu, Xingcai,&Cui, Huijuan.(2017).Tracing changes in atmospheric moisture supply to the drying Southwest China.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(17),10383-10393.
MLA Zhang, Chi,et al."Tracing changes in atmospheric moisture supply to the drying Southwest China".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.17(2017):10383-10393.
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