摘要
利用常规气象观测资料、NCEP 1°×1°格点数据以及FY-2E相当黑体亮温(TBB)资料,对2013年4月29—30日景德镇地区锋面暴雨产生的原因进行了初步分析。结果表明,500 hPa槽前负变高大值区诱使低层低值系统发展,850 hPa低涡沿切变线快速东移,配合西南急流的发展北伸,为暴雨区水汽辐合抬升提供了有利条件。伴随着冷锋南下,近地面层冷平流的侵入使得暖湿空气抬升,对流不稳定性增加,上升运动加强,是造成此次强降水的触发机制。景德镇上空不断有对流单体经过、东移,是造成景德镇地区出现暴雨的直接原因,强降水大多出现在TBB低值附近或其梯度区。此次暴雨过程水汽主要来自超低空急流输送,925 hPa水汽通量散度与暴雨落区、强度对应关系较好。
Based on regular observation data, AWS data,FNL analysis data and FY-2E TBB data, the characteristic of a severe frontal rainstorm occurred in the north part of Jiangxi during 29-30 April 2013 was analyzed. The results show that the mass negative change ahead of the 500 hPa trough caused the lower value system to develop to provide the low-level jet for this heavy rainfall. With the cold front southward, the invasion of the cold advection at the ground layer triggered the convective instability, enhanced the lifting action of the moist warm air. According to the analysis of TBB data, it shows that the moving of convective cells over Jingdezhen area was the direct reason for the severe rainstorm occurrence. The intensity of rainfall center occurred near the low value zone or in its gradient areas of TBB.
出处
《气象与减灾研究》
2013年第4期20-25,共6页
Meteorology and Disaster Reduction Research
基金
2013年中国气象局预报员专项(编号:CMAYBY2013-037)
