ODMV/ODMD对长江中下游一次暴雨过程的诊断分析
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袁凯(1986-),男,湖南长沙人,工程师,主要从事中短期天气预报。E-mail:yuankai2009@126.com

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P458.1-21.1

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华中区域气象中心科技发展基金项目(QY-Z-201105);山洪地质灾害防治气象保障工程建设(140101901300116965);


Diagnosis and Analysis of Storm Process in Middle and Lower Reaches of YangtzeRiver by One-dimensional Moist Vorticity and One-dimensional Moist Divergence
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    摘要:

    基于欧洲中期数值预报中心(ECMWF)再分析资料(ERA-interim)和长江中下游124站降水资料以及四种业务常用数值模式资料(EC-thin,T639-thin,Grapes和Japan-thin),以2016年6月30日7月7日长江中下游地区连续性暴雨天气过程为例,详细分析和讨论了四种数值预报模式以及一维湿涡度(ODMV)和一维湿散度(ODMD)对于长江中下游暴雨落区的诊断效果。得到结论如下:(1)无论是主观分析还是与实际降水的空间相似度,ODMV/ODMD对于雨带和强降水中心的把握都明显优于四种数值模式,在空间分布上表现出更高相似性。(2)Japan-thin预报降水显著偏弱,T639-thin则偏强,而EC-thin、Grapes和T639-thin还表现出较大的离散程度,只有ODMV/ODMD对雨带和强降水中心的平均误差和均方根误差都最小,在降水强度上表现出更高准确性。(3)随着降水强度的增加,Japan-thin、EC-thin和Grapes的漏报率增加显著,Threat Score(TS)评分迅速降低;而T639-thin空报率增速较快,TS评分同样下降明显;只有ODMV/ODMD空报率迅速减小,漏报率缓慢增加,TS评分减弱得较慢,至最高标准时(6h≥30 mm),TS评分依然达到0.22,在降水的时间演变上表现出更好的协同性。

    Abstract:

    On the basis of reanalysis data from the European Center for Medium-Range Weather Forecasting (ERA-interim),124 stationsprecipitation data of the middle and lower reaches of the Yangtze River and the data of the 4 numerical forecast models, this paper took thelocal persistent storm process occurred in the middle and lower reaches from 30 June 2016 to 7 July 2016 as example, discussed the 4numerical models and one-dimensional moist vorticity (ODMV) and one-dimensional moist divergence (ODMD)’s diagnosis of storm location forMLRYRV. The results were summarized as follow: (1) No matter subjective analysis or spatial similarity with real precipitation, ODMV/ODMD isbetter than the 4 numerical models for the diagnosis of rain belt and strong precipitation center. (2) Japan-thin’s forecast result significantly weak,while T639-thin’s result is stronger than real precipitation, EC-thin, Grapes and T639-thin’s result also show the greater dispersion, onlyODMV/ODMD is the smallest mean error(ME) and root mean square error(RMSE) no matter for the rain belt or the precipitation center. (3) Withthe precipitation intensity increased, the Non-response rates of Japan-thin, EC-thin and Grapes increased significantly, the Threat Score (TS)reduced sharply; while T639-thin’s empty rate increased faster, the TS reduced quickly also; only ODMV/ODMD’s empty rate decreasedrapidly and Non-response rate increased slowly, the TS decreased slowly, to the highest standard (6h≥30 mm ), the TS still get 0.22.

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  • 收稿日期:2017-08-10
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  • 在线发布日期: 2022-06-23
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