单部多普勒天气雷达风场反演及其在数值预报中的应用试验
WIND-FIELD RETRIEVAL THROUGH SINGLE DOPPLER WEATHER RADAR AND ITS APPLICATION TO NWP
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摘要: 针对1998年7月5日下午到夜间北京地区出现的一次强降雨过程, 采用“局部VAD法”, 对中国气象科学研究院多普勒雷达测得的1998年7月5日12:00UTC的径向风反演成水平风, 并将反演风应用到数值天气预报 (NWP) 同化系统中, 进行了同化预报试验。结果表明, 反演的雷达风基本符合事实, 将其应用到NWP中, 有助于分析和预报时空尺度较小的中尺度系统。Abstract: The local VAD method is used for the wind retrieval from radical wind measured by Doppler radar (data from CAMS, at 12:00UTC, 5 July 1998) into horizontal wind and an experiment is made on the impact of horizontal wind on numerical weather prediction assimilation system for the heavy rain occurred from afternoon to night of 5 July 1998 in the Beijing area.The result shows that the retrieved wind is primarily consistent with the weather process and it can be used in the analysis and prediction of mesoscale systems with smaller temporal and spatial scales.
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图 3 1998年7月5日12:00UTC地面风场 (流场)
(粗实线:东风切变线细实线:流线)[10]
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