Relationship between Quasibiweekly Lowfrequency Oscillations and Precipitation in Shanxi Province from April to September
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Abstract:
The daily precipitation data of Shanxi Province from 1979 to 2010 and the reanalysis dataset of the European Centre for MediumRange Weather Forecasts are used to explore the relationship between atmospheric lowfrequency oscillations in the Eurasian region and the precipitation weather process of Shanxi Province from April to September by the diagnostic analysis method. The results indicate that the daily precipitation patterns in Shanxi can be mainly divided into three types: provincial consistency, NorthCentral, and Central types. Daily precipitation in Shanxi obviously varies with a characteristic of quasibiweekly cycle. The lowfrequency key region of 500 hPa influencing the precipitation in Shanxi is near the Bohai Sea on the East Coast of China and the lowfrequency influence system is the Bohai Sea lowfrequency high. The Bohai Sea lowfrequency high varies with the quasibiweekly cycle. The index of the Bohai Sea lowfrequency high turns into positive phase 0 to 3 days before the precipitation occurrence in Shanxi. The Bohai Sea lowfrequency high originates from the West Siberian lowfrequency high, which is mainly located in east of West Siberia to west of Central Siberia and propagates to the Bohai Sea about a quasibiweekly cycle.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.