大別山區地形降水特征分析
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國家自然科學基金項目(41275030),公益性行業(氣象)科研專項GYHY201306040,安徽省自然科學基金(1508085MD64),中國氣象局項目(CMAGJ2015M28)共同資助


Characteristics of Orographic Precipitation in Dabie Mountain
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    摘要:

    利用2012—2014年地面自動站與中國區域CMORPH(Climate Prediction Center Morphing)多衛星降水數據相融合的逐時降水量數據集,分析大別山區的降水時空分布特征。2012—2014年大別山區年平均降水量9785 mm,〖JP〗降水大值區出現在大別山主峰的東南側,降水主要集中在5—7月,且呈現明顯的地形降水特征。從時間變化情況看,降水量呈現單峰的特征,7月降水量最大。從空間分布情況看,大別山及其東部地區是強降水的頻發區,出現暴雨日數最多的區域位于主峰及其東側。降水中心表現出顯著的季節變化特征,冬季降水中心位于大別山區的東南部,進入春季以后降水中心向西北方向移動,北抬至大別山主峰北側,進入秋季(9月以后)以后降水中心逐漸向南回落。大別山區大氣環流的季節性變化及其與地形的相互作用是造成大別山區出現明顯地形降水(與降水隨海拔先增加后減?。┖徒邓竟澬宰兓闹饕?。

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    The hourly precipitation data sets with a spatial resolution of 01°×01°, which is the integrated CMORPH (Climate Prediction Center Morphing) rainfall products, are used to analyze the temporal and spatial distribution of precipitation in the Dabie Mountain region from 2012 to 2014 The average of annual precipitation was 9785 mm over the Dabie Mountain region, and the heavy rain center was located at the southeast of the Dabie Mountain peak. The main rainfall season was from May to July, with obvious topographic character. There is a single peak in the time series of monthly rainfall, and the monthly average precipitation is the most in July in 12 months. As to the spatial distribution, Dabie Mountain and the area to the East had the more rainfall. The heavy rain and storm rainfall occurred more frequently in these regions, and in the central peak area and the eastern part, there were most heavy rain days, increasing with altitude. The location of the precipitation center moved with seasons. In winter, the precipitation center was located at the southeastern part of the peak, and in spring it moved northwestward and was located at the north of the main peak. From September, the center came back to the south of the main peak. It is concluded that the evolvement of atmospheric circulation and the interaction with terrain were the main causes for the orographic precipitation (precipitation increasing with the elevation) and seasonal variation.

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倪婷,黃勇,凌新鋒,黃國貴,李景安.大別山區地形降水特征分析[J].氣象科技,2018,46(3):556~562

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  • 收稿日期:2017-05-08
  • 定稿日期:2018-01-11
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  • 在線發布日期: 2018-06-28
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