A New Precipitation Index for the Spatiotemporal Distribution of Drought and Flooding in the Reaches of the Yangtze and Huaihe Rivers and Related Characteristics of Atmospheric Circulation |
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Authors: | ZONG Haifeng and ZHANG Qingyun |
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Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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Abstract: | Characteristics of the spatiotemporal distributions of precipitation
anomalies in the reaches of the Yangtze River and Huaihe River (YHR) were
studied using EOF method. Four main precipitation patterns for the YHR in
summer identified by the first two modes: a region-wide flood over the
entire YHR (RWF); a region-wide drought over the entire YHR (RWD); a flood
in the south with a drought in the northern region of the Yangtze River
(FS-DN); and a drought in the south with a flood in the northern region of
the Yangtze River (DS-FN). Based on the first two modes and the actual
precipitation departure percentage, a new precipitation index is defined in
this paper. The typical flood/drought years associated with the various
rainfall patterns defined by this precipitation index are more
representative and closer to reality compared to some existing precipitation
indexes which just use the area-mean precipitation or the EOF time
components individually.
The characteristics of atmospheric circulation in summer corresponding to
the four main precipitation patterns over the YHR in summer show the
features of atmospheric circulation differ in different precipitation
pattern years. Although the different patterns share a common main
influential circulation system, such as the blocking high over northeastern
Asia, the low trough of westerly flows in the mid latitudes, the West
Pacific Subtropical High (WPSH), and the high ridge over the Tibet Plateau,
the difference in location and intensity of these systems can lead to
different distributions of precipitation anomalies. |
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Keywords: | reaches of Yangtze River and Huaihe River precipitation index precipitation patterns |
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