Abstract
Based on the summer precipitation data from the Huaihe River valley and the middle and lower reaches of the Yangtze River from 1922 to 2007, we analyzed the interannual and interdecadal oscillation and probability distribution characteristics of summer precipitation in the Huaihe River valley during the same period, using the wavelet transform and generalized extreme distribution methods. Whereby, we studied the climate background of East Asia Summer Monsoon (EASM), Sea Surface Temperature (SST), East Asia telecorrelation circulation, and their relationship with the interannual and interdecadal oscillation of summer precipitation in the Huaihe River valley. We further compared the difference of interdecadal oscillation of summer precipitation and the relevant climate background between the Huaihe River valley and the middle and lower reaches of the Yangtze River. The results show that: 1) The intensity change of quasi-biennial oscillation (QBO) of summer precipitation in the Huaihe River valley is consistent with that of interdecadal oscillation. The summer precipitation in the Huaihe River valley has been more than normal since the end of the 1990s, and the QBO is very significant. Meanwhile, the probability of occurrence of extreme heavy rainfall increased obviously. 2) The interdecadal oscillation of summer precipitation in the Huaihe River valley has a close relationship with the Pacific Decadal Oscillation (PDO) and interdecadal oscillation of EASM. When PDO is in the cold phase and EASM weakens, the summer precipitation will be greater than normal. 3) QBO of summer precipitation in the Huaihe River valley is mainly controlled by that of EASM, and it has a relationship with a circulation pattern of “positive-negative-positive” from the high to the low latitudes in East Asia. 4) There is interdecadal phase difference in summer precipitation between the Huaihe River valley and the middle and the lower reaches of the Yangtze River, which is mainly related to the intensity and position of West Pacific subtropical high.
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Wei, F., Zhang, T. Oscillation characteristics of summer precipitation in the Huaihe River valley and relevant climate background. Sci. China Earth Sci. 53, 301–316 (2010). https://doi.org/10.1007/s11430-009-0151-7
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DOI: https://doi.org/10.1007/s11430-009-0151-7