Dominant Patterns of Summer Rainfall Anomalies
in East China during 1951--2006 |
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| Authors: | YE Hong and LU Riyu |
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| Institution: | State Key Laboratory of Numerical Modelling for Atmospheric Sciences and Geophysical Fluid Dynamics,
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The dominant patterns of summer rainfall anomalies in East China were
studied using Empirical Orthogonal Function (EOF) analysis. The results
indicate that after the late 1970s, the first and second dominant patterns
switched. During the period before the late 1970s, the spatial pattern of
the first (second) dominant mode was the ``Yangtze River pattern' (the
``South China pattern'), but this changed to the ``South China pattern'
(the ``Yangtze River pattern') after the late 1970s. This decadal change in
the dominant patterns resulted from a significant decadal change in summer
rainfall over South China after the late 1970s, i.e., a negative phase
during 1978--1992 and a positive phase during 1993--2006. When the decadal
variation of rainfall in East China is omitted from the analysis, the first
and second dominant patterns represent the ``Yangtze River pattern' and the
``South China pattern', respectively. These results suggest that when
decadal variation is included, the rainfall in China may be dominated by one
mode during certain periods and by another in other periods. For the
interannual variability when decadal variation is excluded, however, the
first and second modes can be easily distinguished, and their order has been
stable since at least 1951. |
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| Keywords: | dominant patterns summer rainfall interannual variability South China decadal variation |
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