A Simulation Study of a Heavy Rainfall Process over the Yangtze River Valley Using the
Two-Way Nesting Approach |
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Authors: | WANG Shuzhou YU Entao and WANG Huijun |
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Institution: | Nansen-Zhu International Research Center, Institute of Atmospheric Physics,
Chinese Academy of Sciences, Beijing 100029, Graduate University of Chinese Academy of Sciences, Beijing 100049 |
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Abstract: | In this study, the major features of a heavy rainfall event in the Yangtze
River region on 3--7 June 2011 and its event-related large-scale circulation
and predictability were studied. Both observational analysis and model
simulation were used, the latter being based on the Weather Research and
Forecasting (WRF) model forced by NCEP Global Forecast System (GFS)
datasets. It was found that, during 3--5 June, the western Pacific
subtropical high apparently extended to the west and was much stronger, and
the Indian summer monsoon trough was slightly weaker than in normal years.
The east--west oriented shear line over the middle and lower reaches of the
Yangtze River was favorable for the transportation and convergence of water
vapor, and the precipitation band was located slightly to the south of the
shear line. During 6--7 June, the western Pacific subtropical high retreated
eastward, while the trough over the Okhotsk Sea deepened. The low vortex in
Northeast China intensified, bringing much more cold air to the middle and
lower reaches of the Yangtze River, and the shear line over this area moved
slightly southward. The convection band moved southward and became weaker,
so the rainfall during 6--7 June weakened and was located slightly to the
south of the previous precipitation band. Many of the observed features,
including background circulation and the distribution and amount of
precipitation, were reproduced reasonably by the WRF, suggesting a
feasibility of this model for forecasting extreme weather events in the
Yangtze River region. |
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Keywords: | WRF Yangtze River valley heavy rainfall shear line |
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