NDLI: Modeling impacts of East Asian Ocean-Land thermal contrast on spring southwesterly winds and rainfall in eastern China

Content Provider	Springer Nature Link
Author	Zhao, Ping Jiang, PinPing Zhou, XiuJi Zhu, CongWen
Copyright Year	2009
Abstract	Using the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis dataset, the NOAA’s Climate Prediction Center’s merged analysis of precipitation, and the MM5v3 Meso-scale Model, the impacts of surface temperature differences between the East Asian land and its adjacent oceans on spring southwesterly winds and rainfall over eastern China are studied. The modeling results show that the temperature differences exert strong influence on the occurrence of the southwesterly winds and rainfall over southern China and their northward advances. When surface temperature increases over the land and decreases over the oceans, the temperature gradient with a winter feature earlier changes toward the gradient with a summer feature. Both the low-pressure system east of the Tibetan Plateau and the subtropical high-pressure system over the western Pacific strengthen, accompanying with the strengthening of the lower-tropospheric southwesterly winds over eastern China. Accordingly, the upward motion increases over the Yangtze-Huaihe River (YHR) valleys and decreases over southern China, leading to an increase of spring rainfall over the YHR valleys and a decrease over southern China. Thus, the rain belt over eastern China appears over the YHR valleys but not over southern China. Under a weaker condition of the spring thermal contrast, the rain belt does not occur over eastern China. When the spring thermal contrast pronouncedly strengthens, the rain belt over southern China may advance northward into the YHR valleys during spring, though there is no onset of the tropical monsoon over the South China Sea. This forms a rain belt similar to that of the YHR valleys during the summer Meiyu period.
Starting Page	4733
Ending Page	4741
Page Count	9
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	54
Issue Number	24
e-ISSN	18619541
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-05-08
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	East Asian thermal contrast rainy season over southern China southwesterly wind numerical simulation Engineering Earth Sciences Chemistry/Food Science Physics Life Sciences Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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