ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Weather Patterns and Interannual Variations of Typhoon Torrential Rain during Midsummer in North China
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Abstract:
There were ten typhoon torrential rain events in North China during the midsummer from 1949 to 1996.Their maxima of total course rainfall (abbreviated to MTCR) each event were more than 400mm.By using the view point of the interaction between typhoon and westerly trough,weather patterns of these events have been classified.By practical experience,the typhoon trough,Hetao westerly trough,the high pressure of Japanese seaBohai sea,SEwind jet at 850hPa over Shanghai area and the weakcold air intrusion into typhoon are to be considered as the weather pattern criteria.It is shown that only five of the ten events belong to the interaction weather patterns′ but the others aren′t.These five events took place in the first tendays of Aug.in 1950,1963,1975,1984 and 1996.Besides,the interannual variations in typhoon′s MTCR have been computed by the lagcovariance power spectral analysis.It is shown that there are two periods.One is 11 yrs,the other is 31 yrs.And the 5 interaction weather pattern events mentioned above are the main components of the 11 yr period.According to the crossspectral analysis,there is a high coherence with high confidence at intervals of 11 years between the typhoon′s MTCR and the sun spots.Phase angle difference shows that the year of typhoon′s exceptional MTCR in general lags around 5 yrs behind the Myear of the sun spots.
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