气候变化领域集成服务门户(CCPortal): Changes in Moisture Flux over the Tibetan Plateau during 1979-2011 and Possible Mechanisms

CCPortal

DOI	10.1175/JCLI-D-13-00321.1
	Changes in Moisture Flux over the Tibetan Plateau during 1979-2011 and Possible Mechanisms
	Gao, Yanhong; Cuo, Lan; Zhang, Yongxin
通讯作者	Gao, YH (通讯作者)
发表日期	2014
ISSN	0894-8755
EISSN	1520-0442
起始页码	1876
结束页码	1893
卷号	27 期号:5
英文摘要	Changes in moisture as represented by P - E (precipitation - evapotranspiration) and the possible causes over the Tibetan Plateau (TP) during 1979-2011 are examined based on the Global Land Data Assimilation Systems (GLDAS) ensemble mean runoff and reanalyses. It is found that the TP is getting wetter as a whole but with large spatial variations. The climatologically humid southeastern TP is getting drier while the vast arid and semiarid northwestern TP is getting wetter. The Clausius-Clapeyron relation cannot be used to explain the changes in P - E over the TP. Through decomposing the changes in P - E into three major components-dynamic, thermodynamic, and transient eddy components-it is noted that the dynamic component plays a key role in the changes of P - E over the TP. The thermodynamic component contributes positively over the southern and central TP whereas the transient eddy component tends to reinforce (offset) the dynamic component over the southern and parts of the northern TP (central TP). Seasonally, the dynamic component contributes substantially to changes in P - E during the wet season, with small contributions from the thermodynamic and transient eddy components. Further analyses reveal the poleward shift of the East Asian westerly jet stream by 0.7 degrees and poleward moisture transport as well as the intensification of the summer monsoon circulation due to global warming, which are shown to be responsible for the general wetting trend over the TP. It is further demonstrated that changes in local circulations that occur due to the differential heating of the TP and its surroundings are responsible for the spatially varying changes in moisture over the TP.
关键词	ATMOSPHERIC HEAT-SOURCE CLIMATE-CHANGE HYDROLOGICAL CYCLE WEAKENING TREND HADLEY-CELL ERA-INTERIM PRECIPITATION HYDROCLIMATE EXPANSION RANGE
英文关键词	Moisture/moisture budget; Water budget; Hydrometeorology; Climate change
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000331689900003
来源期刊	JOURNAL OF CLIMATE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258284
推荐引用方式 GB/T 7714	Gao, Yanhong,Cuo, Lan,Zhang, Yongxin. Changes in Moisture Flux over the Tibetan Plateau during 1979-2011 and Possible Mechanisms[J]. 中国科学院青藏高原研究所,2014,27(5).
APA	Gao, Yanhong,Cuo, Lan,&Zhang, Yongxin.(2014).Changes in Moisture Flux over the Tibetan Plateau during 1979-2011 and Possible Mechanisms.JOURNAL OF CLIMATE,27(5).
MLA	Gao, Yanhong,et al."Changes in Moisture Flux over the Tibetan Plateau during 1979-2011 and Possible Mechanisms".JOURNAL OF CLIMATE 27.5(2014).