摘要
通过对比2008年1月出现在华南的冬季准静止锋和1998年6—7月出现在江淮流域的夏季梅雨锋得出如下结论:(1)2008年冬季静止锋和1998年夏季梅雨锋的阻塞形势和暖湿气流来源基本一致。(2)锋生作用均在低层较为明显,但锋生结构不同。2008年冬季静止锋锋生较强,坡度较小,高度到达对流层中上层;1998年夏季梅雨锋锋生较弱,锋区主要集中在800 hPa以下。2008年降水主要发生在静止锋北侧,1998年夏季降水则主要发生在锋区附近。(3)影响锋生的要素不同。2008年静止锋锋生为温度、湿度、风场的共同作用;而1998年静止锋锋生主要为湿度和风场的影响,温度场几乎没有对其产生影响。(4)降水机制不同,2008年1月的冰雪天气为静止锋锋面抬升和高低空急流的耦合抬升共同作用所致,而1998年夏季的梅雨是由低层不稳定的触发、高低空急流的耦合抬升共同作用造成的。
Comparing the quasi-stationary front in the winter of 2008 with the Meiyu front in the summer of 1998 the conclusion is that （1） The blocking situations and the sources of warm and wet flows of quasi-stationary front in the winter of 2008 and Meiyu front in the summer of 1998 were mainly consistent. （2） The frontogenetic actions were relatively obvious in the lower edge, but the frontolysis structures were different. The frontogenesis of quasi-stationary front in the winter of 2008 was stronger, the gradient was smaller, and it is reached to the mid-upper troposphere. The rainfall was in north of the front. The frontogenesis of Meiyu front in the summer of 1998 was weaker, the frontogenetical areas were mainly below 800 hPa, the rainfall was nearby the front. （3） The factors influenced the frontogenesis were different. The frontogenesis in 2008 was influenced by the combined action of temperature,humidity and wind, and the humidity and wind were the main factors in 1998. （4） The precipitation mechanism was different. There was the combined action of the frontal lifting and the coupled High/Low Level Jets in January 2008, and the Meiyu in 1998 were triggered by both of the low level instability and coupled High/Low Level Jets.
出处
《暴雨灾害》
2009年第4期349-356,共8页
Torrential Rain and Disasters
基金
国家科技支撑项目"南方冰雪灾害天气预测预警评估技术研究"资助
