ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Causes Analysis of Abnormal Rainfall and Its Largescale Circulation During 2007 Meiyu Season
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Abstract:
Using daily NCEP/NCAR reanalysis dataset and the historical Meiyu feature index etc., the causes of abnormal rainfall and its largescale circulation during 20 07 Meiyu season are analyzed in order to better understand the evolvement charac teristics of persistent rainfall and its atmospheric circulation on JiangHuai Meiyu, and to discuss technical approaches of midrange forecast. The results s how that the stability of the western Pacific subtropical high located in the so uth more persistently than normal in middlelate July during Meiyu season plays a crucial role in the temporal and spatial characteristics during 2007 Meiyu pe riod. The frequent appearance of blocking high and abnormal strong subtropical monsoon surge provide favored dyna mic, thermodynamic and moisture factors affecti ng maintenance and intensification of Meiyu front. The activity of “Iran type” south Asia High and upperlow level coupling dynamic action of subtropical jet in East Asia not only create favorable vertical circulation structure for pe rsistent heavy rainfall but also restrain northward movement of subtropical high . At last, the keys of midrange forecast are summarized on the basis of these results.
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