广东前汛期一次锋前暖区暴雨触发机制分析
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摘要
利用ECMWF的ERAdata再分析资料、Micaps实况等数据,对2015年5月22—24日的广东大范围强降雨过程进行分析,结果表明:该次过程是一次典型的华南前汛期降雨过程,过程中存在明显的两种性质降雨,即粤西北由南支短波槽、低涡、切变线造成的锋面型暴雨,而珠江口及其东侧的暖区暴雨主要是由西南低空急流脉冲引起的;珠江口及其东侧的暖区暴雨的触发机制主要为中尺度能量锋、地面辐合线以及地形等。
Using the data of ERAdata reanalysis from the ECMWF and the observations of Micaps, an extensive heavy rain that happened on May 22-24, 2015 is studied. The result is shown as follows. The weather was a rain process typical of the annually first rainy season in the south of China. It was made up of two kinds of rain, the one in northwestern Guangdong was caused by a shortwave trough in the southern branch of the westerlies, a low vortex and a shear and the other over the Pearl River Delta and its eastern area was a warm-sector heavy rain resulting from the pulsation of a southwesterly low-level jet stream. The triggering mechanism for the latter was mainly a mesoscale energy front, a surface convergence line and the terrain.
Using the data of ERAdata reanalysis from the ECMWF and the observations of Micaps, an extensive heavy rain that happened on May 22-24, 2015 is studied. The result is shown as follows. The weather was a rain process typical of the annually first rainy season in the south of China. It was made up of two kinds of rain, the one in northwestern Guangdong was caused by a shortwave trough in the southern branch of the westerlies, a low vortex and a shear and the other over the Pearl River Delta and its eastern area was a warm-sector heavy rain resulting from the pulsation of a southwesterly low-level jet stream. The triggering mechanism for the latter was mainly a mesoscale energy front, a surface convergence line and the terrain.
引文
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[10]龚春芳,覃昌柳,张丁丁.2016年6月11-14日来宾市锋前暖区暴雨过程分析[J].气象研究与应用,2017,38(Z1):34-36.
[11]覃艳秋,刘蕾.华南锋前暖区暴雨研究概述[J].气象研究与应用,2017,38(1):26-29.
[2]周秀骥,薛纪善,陶祖钰,等.98华南暴雨科学试验研究[M].北京:气象出版社,2003.
[3]马慧,陈桢华,毛文书,等.华南前汛期降雨异常及其环流特征分析[J].热带气象学报,2009,25(1):89-96.
[4]梁巧倩,林良勋,谢健标,等.广东前汛期西风槽暴雨个例的强度及落区[J].广东气象,2007,29(2):32-35.
[5]陈芳丽,张子凡,李明华,等.惠州市近40年前汛期暴雨的气候特征分析[J].广东气象,2014,36(3):25-29.
[6]高亭亭,梁卫,罗聪,等.广州前汛期暴雨气候特征分析[J].广东气象,2012,34(2):1-4.
[7]黄晓东,梁巧倩,郑伟杰,等.2009年广东前汛期一次连续性特大暴雨的特征及成因[J].广东气象,2009,31(6):5-9.
[8]蔡睿,王和权,王伟良,等.不同边界层参数化方案在暴雨数值模拟中的对比分析[J].广东气象,2005,27(1):6-8.
[9]文丹青,黄波,刘峰.一次华南前汛期锋前暖区暴雨分析[J].广东气象,2011,33(2):9-15.
[10]龚春芳,覃昌柳,张丁丁.2016年6月11-14日来宾市锋前暖区暴雨过程分析[J].气象研究与应用,2017,38(Z1):34-36.
[11]覃艳秋,刘蕾.华南锋前暖区暴雨研究概述[J].气象研究与应用,2017,38(1):26-29.