甘肃陇南地震灾区2次暴雨过程的诊断对比
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摘要
利用常规气象资料和NCEP再分析资料,对2008年6月30日和7月21日发生在陇南灾区的2次暴雨过程进行诊断对比分析。结果表明:"6.30"暴雨过程的主要影响系统是切变低涡,水汽条件和能量条件都相当好,但垂直上升运动不太剧烈,致使陇南灾区达到暴雨标准的站数相对较少;"7.21"暴雨的主要影响系统是高原低涡,能量条件不如"6.30"暴雨充分,但水汽及垂直运动条件较好,形成暴雨的3个条件基本满足,致使陇南灾区50%以上的站达到暴雨标准。而暴雨的成灾程度与暴雨中心落区有密切关系。
Based on the conventional observations and NCEP reanalysis data,the two similar storm cases occurred on June 30 and July 21,2008 in Longnan disaster area were diagnosed.The analytic conclusions are as follows: The shearing low vortex was the main influence system of "6.30" heavy rainfall,but less ascending motion resulted in less stations's precipitation up to 50 mm. The plateau low vortex was the main influence system of "7.21" storm rainfall,because of better vapor condition and strong vertical ascending motion,the precipitation in 50 percent stations of Longnan region was more than 50 mm during "7.21" storm rainfall.The relation is in evidence between the loss from heavy rainfall disaster and the center area of rainfall.
Based on the conventional observations and NCEP reanalysis data,the two similar storm cases occurred on June 30 and July 21,2008 in Longnan disaster area were diagnosed.The analytic conclusions are as follows: The shearing low vortex was the main influence system of "6.30" heavy rainfall,but less ascending motion resulted in less stations's precipitation up to 50 mm. The plateau low vortex was the main influence system of "7.21" storm rainfall,because of better vapor condition and strong vertical ascending motion,the precipitation in 50 percent stations of Longnan region was more than 50 mm during "7.21" storm rainfall.The relation is in evidence between the loss from heavy rainfall disaster and the center area of rainfall.
引文
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[2]曹殿斌,钟幼军,吴英.黑龙江省2006年7月8-10日暴雨过程分析[J].黑龙江气象,2007(3):11-12.
[3]胡淑兰,李社宏,杜继稳.2005年10月秋季连阴雨中暴雨天气特征分析[J].陕西气象,2007(1):8-11.
[4]张天峰,王位泰,吴爱敏,等.庆阳一次暴雨天气过程雷达回波特征[J].干旱气象,2007,25(3):61-65.
[5]王建兵,王振国,李晓媛,等.甘南高原一次突发性强对流天气的诊断分析[J].干旱气象,2007,25(3):54-60.
[6]冯军,樊明,尚学军.甘肃宕昌“5.31”局地暴雨分析[J].气象科技,2001(3):15-20.
[7]宋连春.干旱地区气象研究[M].北京:气象出版社,2002.
[8]王锡稳,陶建红,冯军,等.陇南“5.31”特大泥石流灾害成因分析[J].气象,2004(10):43-46.
[9]张京红,韦云强,刘淑珍,等.暴雨型泥石流多层预报系统的研究[J].气象科学,2006(5):548-552.
[10]丁永红,马金仁,纪晓玲.一场大范围强对流天气的成因分析[J].干旱气象,2006,24(1):28-33.
[11]朱乾根,林锦瑞,寿绍文,等.天气学原理与方法(第三版)[M].北京:气象出版社,2000.319-396.
[12]Uccellini L W,Johnson D R.The coupling of upper and lowertropospheric jet streaks and implications for the development of se-vere convective storms[J].Mon Wea Rev,1979(107):682-703.
[13]陈乾,张久林,陈添宇.祁连山区2006年夏季降水过程的天气分析[J].干旱气象,2008,26(4):22-28.
[14]孔玉寿,章东华.现代天气预报技术(第二版)[M].北京:气象出版社,2005.89-120.
[15]刘健文.天气分析预报物理量计算基础[M].北京:气象出版社,2005.91-96,127-128.
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