摘要
2011年6月28—30日广东南部沿海及珠江三角洲地区发生连续强降水过程,其中29日强降水发生在季风涌背景下。采用常规气象资料、区域自动站资料以及NCEP/NCAR分辨率1°×1°再分析资料,着重分析29日受季风涌影响的强降水成因。结果表明,此次过程发生在季风槽偏强的背景下,季风涌的爆发和加强主要表现在低空急流的增强上;无论时间上和空间上,低空急流与强降水均有很好的对应关系,其左侧的强辐合与高层的强辐散相配合,是强降水发生发展的原因之一;季风涌爆发后,不稳定能量得到再次积累,大气维持高温高湿的条件不稳定状态,有利于降水增大和维持。
A continuous torrential rain case occurred in the south coastal areas and Pearl River delta region of Guangdong province during June 28-30, 2011. And on June 29, the heavy rain happened against the background of the monsoon surge. By using conventional observation data, data from regional automatic station and NECP/NCAR 1° × 1° 6-hourly reanalysis data, the analysis is made mainly on the cause of the torrential rain affected by the monsoon surge on June 29. The results show that this process occurred against the background of the stronger monsoon trough. The breakout and increase of monsoon surge showed mainly the strengthening of low level jet. There is a good correspondence between the low-level jet and heavy precipitation temporally and spatially. The coordination between the strong convergence on the left side of low-level jet and the strong high-level convergence is one of the reasons for the occurrence and development of heavy precipitation. After the outbreak of the monsoon surge, the unstable energy accumulated again. This is conducive to the precipitation increase and maintenance.
出处
《暴雨灾害》
2012年第3期272-279,共8页
Torrential Rain and Disasters
基金
广东省气象局科研项目"阳江地区局地致洪强降水分析与诊断预报"(2011B23)
"阳江中小尺度系统灾害性天气预报研究"(2006C02)
"阳江强局地暴雨的特征及新型探测资料应用"(2007A01)
关键词
南海季风涌
强降水
季风槽
低空急流
severe precipitation
South China Sea monsoon surge
monsoon trough
low-level jet
