抚顺地区夏季降水异常的气候特征分析
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辽宁省厅局课题“基于雷达的抚顺市短临预警技术研究”(2015SXG08)、抚顺市科学技术研究课题“抚顺市风预报方法研究”资助


Climate Characteristics of Summer Precipitation Anomaly in Fushun
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    摘要:

    利用1951—2012年NCEP/NCAR再分析月平均资料及章党观测站月平均降水数据,利用统计学方法从大气环流等方面对抚顺地区夏季降水异常气候特征进行了分析探讨。结果表明:抚顺地区夏季降水存在明显年际尺度周期特征,西太平洋副热带高压北界越偏北、强度越强则抚顺地区降水强度越大。抚顺地区降水强(弱)年,500 hPa高度场抚顺地区位于距平低涡(高压)底前部,850 hPa风场抚顺地区处于西南(偏北)气流控制之下,海平面气压场抚顺地区位于蒙古气旋底前部(反气旋前部),比湿场抚顺位于比湿距平正值(负值)区内。降水强年的温度场距平低值中心落后于500 hPa高度场低值中心,利于高空槽的发展,有利于降水的维持加强,降水弱年的温度场距平低值中心与500 hPa高度场低值中心相配合,对高空槽脊的发展无明显的影响。

    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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李俊乐,吕志红,张鸿,隋明,马晓晨,刘帅,刘明.抚顺地区夏季降水异常的气候特征分析[J].气象科技,2016,44(6):998~1003

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历史
  • 收稿日期:2015-12-17
  • 定稿日期:2016-07-05
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  • 在线发布日期: 2016-12-26
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