DOI: 10.1175/JCLI-D-13-00321.1
Scopus记录号: 2-s2.0-84897623228
论文题名: Changes in moisture flux over the tibetan plateau during 1979-2011 and possible mechanisms
作者: Gao Y. ; Cuo L. ; Zhang Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 5 起始页码: 1876
结束页码: 1893
语种: 英语
Scopus关键词: Clausius Clapeyron relation
; Differential heating
; Dynamic component
; Land data assimilation systems
; Poleward moisture transport
; Possible mechanisms
; Spatial variations
; Westerly jet streams
; Global warming
; Thermodynamics
; Moisture
; atmospheric circulation
; eddy
; ensemble forecasting
; evapotranspiration
; global warming
; jet stream
; moisture flux
; precipitation (climatology)
; spatial variation
; thermodynamic property
; twentieth century
; twenty first century
; China
; Qinghai-Xizang Plateau
英文摘要: Changes in moisture as represented by P - E (precipitation 2 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° 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. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50932
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China; Key Laboratory of Tibetan Environmental Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Gao Y.,Cuo L.,Zhang Y.. Changes in moisture flux over the tibetan plateau during 1979-2011 and possible mechanisms[J]. Journal of Climate,2014-01-01,27(5)