撫順地區夏季降水異常的氣候特征分析
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遼寧省廳局課題“基于雷達的撫順市短臨預警技術研究”(2015SXG08)、撫順市科學技術研究課題“撫順市風預報方法研究”資助


Climate Characteristics of Summer Precipitation Anomaly in Fushun
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    摘要:

    利用1951—2012年NCEP/NCAR再分析月平均資料及章黨觀測站月平均降水數據,利用統計學方法從大氣環流等方面對撫順地區夏季降水異常氣候特征進行了分析探討。結果表明:撫順地區夏季降水存在明顯年際尺度周期特征,西太平洋副熱帶高壓北界越偏北、強度越強則撫順地區降水強度越大。撫順地區降水強(弱)年,500 hPa高度場撫順地區位于距平低渦(高壓)底前部,850 hPa風場撫順地區處于西南(偏北)氣流控制之下,海平面氣壓場撫順地區位于蒙古氣旋底前部(反氣旋前部),比濕場撫順位于比濕距平正值(負值)區內。降水強年的溫度場距平低值中心落后于500 hPa高度場低值中心,利于高空槽的發展,有利于降水的維持加強,降水弱年的溫度場距平低值中心與500 hPa高度場低值中心相配合,對高空槽脊的發展無明顯的影響。

    Abstract:

    The climate characteristics of summer precipitation anomaly in Funshun is investigated by using the monthly NCEP/NCAR reanalysis data and the monthly precipitation observations from the Zhangdang observation station from 1951 to 2012. Using the statistical methods and through the analysis of the characteristics of the atmospheric circulation, the climate characteristics of the summer precipitation anomaly in Fushun are discussed. The results show that summer precipitation in Fushun has obvious interannual scale periodic characteristics, and the more northern (the stronger) the western Pacific subtropical high north border (intensity) is, the stronger the rainfall intensity of the summer precipitation in Fushun area is. In the strong (weak) rainfall years in Fushun, in the 500 hPa height field, Fushun is at the front of the low vortex (high pressure) area; in the 850 hPa wind field, Fushun is controlled by the southwest (north) airflow; in the sea level pressure field, Fushun is located in the front of the bottom of the Mongolia cyclone (anticyclone); in the specific humidity field, Fushun is located in the positive (negative) specific humidity anomaly zone. In strong precipitation years, low temperature anomaly center behind the 500 hPa height field lowvalue centers, conducive to the development of the upper trough, is advantageous to keep strengthening the precipitation; while in weak precipitation years, low temperature anomaly center matching with the 500 hPa height field low center has no obvious influence on the development of upper troughs and ridges.

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李俊樂,呂志紅,張鴻,隋明,馬曉晨,劉帥,劉明.撫順地區夏季降水異常的氣候特征分析[J].氣象科技,2016,44(6):998~1003

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  • 收稿日期:2015-12-17
  • 定稿日期:2016-07-05
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  • 在線發布日期: 2016-12-26
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