云迹风资料同化对暴雨预报影响的数值模拟

NUMERICAL SIMULATION OF CMWDA WITH IT’S IMPACTING ON TORRENTIAL RAIN FORECAST

中文关键词:  云迹风  资料同化  暴雨预报  数值模拟

英文关键词:Cloud motion wind  Data assimilation  Torrential rain forecast  Numerical simulation

中文摘要:

      文中运用MM5对1998年6月13～14日长江中下游一次暴雨强降水进行了数值模拟及云迹风资料同化试验研究。结果表明,云迹风资料同化能有效地改善高空风场质量,修正控制试验中模式高空风场对中纬度高空西风急流前沿西风强度的描述,使得模拟的暴雨强度与实际降水分布更加接近。分析认为在暴雨预报业务和科研中,云迹风资料的使用可有效地改善高空风场分布,对提高降水预报质量是一个有效途径,值得进一步尝试。

英文摘要:

      In the context of MM5, this paper investigates the numerical simulation of cloud mot ion wind data assimilation (CMWDA) with its impacting on a torrential rain over low-mid Yangtze reaches in 1998. Evdence suggests that CMWDA can availably modify the zonal wind intensity in front of high level jet, and it have an obvious improvement on quality of upper wind. In such a way as to get more accrate precipitation field. There is no doubt that the use of cloud motion wind data is an important approach to enhance the rainfall forecast in operation and research work.