气候变化领域集成服务门户(CCPortal): Intraseasonal soil moisture-atmosphere feedbacks on the tibetan plateau circulation

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DOI	10.1175/JCLI-D-20-0377.1
	Intraseasonal soil moisture-atmosphere feedbacks on the tibetan plateau circulation
	Talib J.; Taylor C.M.; Duan A.; Turner A.G.
发表日期	2021
ISSN	08948755
起始页码	1789
结束页码	1807
卷号	34 期号:5
英文摘要	Substantial intraseasonal precipitation variability is observed across the Tibetan Plateau (TP) during boreal summer associated with the subtropical jet location and the Silk Road pattern. Weather station data and satellite observations highlight a sensitivity of soil moisture and surface fluxes to this variability. During rain-free periods of two or more days, skin temperatures are shown to rise as the surface dries, signalling decreased evaporative fraction. Surface fluxes are further enhanced by relatively clear skies. In this study we use an atmospheric reanalysis to assess how this surface flux response across the TP influences local and remote conditions. Increased surface sensible heat flux induced by decreased soil moisture during a regional dry event leads to a deepening of the planetary boundary layer and the development of a heat low. Consistent with previous studies, heat low characteristics exhibit pronounced diurnal variability driven by anomalous daytime surface warming. For example, low-level horizontal winds are weakest during the afternoon and intensify overnight when boundary layer turbulence is minimal. The heat low favors an upper-tropospheric anticyclone that induces an upper-level Rossby wave and leads to negative upper-level temperature anomalies across southern China. The Rossby wave intensifies the upper-level cyclonic circulation across central China, while upper-level negative temperature anomalies across south China extend the west Pacific subtropical high westward. These circulation anomalies influence temperature and precipitation anomalies across much of China. The association between land-atmosphere interactions across the TP, large-scale atmospheric circulation characteristics, and precipitation in East Asia highlights the importance of intraseasonal soil moisture dynamics on the TP. © 2021 American Meteorological Society
英文关键词	Atmosphere-land interaction; Boundary layer; Energy budget/balance; Land surface; Numerical weather prediction/forecasting; Soil moisture
语种	英语
scopus关键词	Association reactions; Atmospheric thermodynamics; Boundary layers; Heat flux; Mechanical waves; Precipitation (meteorology); Surface measurement; Tropics; Atmospheric circulation; Atmospheric reanalysis; Boundary layer turbulence; Land atmosphere interaction; Planetary boundary layers; Precipitation anomalies; Precipitation variability; Upper level temperatures; Soil moisture; atmospheric circulation; boundary layer; climate feedback; energy budget; land surface; land-atmosphere interaction; precipitation (climatology); seasonal variation; soil moisture; surface flux; weather forecasting; China; Qinghai-Xizang Plateau
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178709
作者单位	U.K. Centre for Ecology and Hydrology, Wallingford, United Kingdom; National Centre for Earth Observation, Wallingford, United Kingdom; State Key Laboratory of Numerical Modelling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, China; Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Talib J.,Taylor C.M.,Duan A.,et al. Intraseasonal soil moisture-atmosphere feedbacks on the tibetan plateau circulation[J],2021,34(5).
APA	Talib J.,Taylor C.M.,Duan A.,&Turner A.G..(2021).Intraseasonal soil moisture-atmosphere feedbacks on the tibetan plateau circulation.Journal of Climate,34(5).
MLA	Talib J.,et al."Intraseasonal soil moisture-atmosphere feedbacks on the tibetan plateau circulation".Journal of Climate 34.5(2021).