[1]钟有亮,李勋,张诚忠,等.NUDGING方法同化雷达反射率因子个例试验研究[J].气象研究与应用,2021,42(03):76-82.[doi:10.19849/j.cnki.CN45-1356/P.2021.3.13]
　Zhong Youliang,Li Xun,Zhang Chengzhong,et al.A case study of assimilated radar reflectivity factor by NUDGING method[J].Journal of Meteorological Research and Application,2021,42(03):76-82.[doi:10.19849/j.cnki.CN45-1356/P.2021.3.13]
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NUDGING方法同化雷达反射率因子个例试验研究()
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气象研究与应用[ISSN:1673-8411/CN:45-1356/P]

卷:
第42卷
期数:
2021年03期
页码:
76-82
栏目:
新技术应用
出版日期:
2021-10-08

文章信息/Info

Title:
A case study of assimilated radar reflectivity factor by NUDGING method
作者:
钟有亮1;  李勋1;  张诚忠2;  陈法敬3
1. 海南省气象台, 海口 570203;
2. 中国气象局广州热带海洋气象研究所, 广州 510080;
3. 国家数值预报中心, 北京 100081
Author(s):
Zhong Youliang1;  Li Xun1;  Zhang Chengzhong2;  Chen Fajing3
1. Hainan Meteorological Observatory, Haikou Hainan 570203;
2. Guangzhou Institute of Tropical Marine Meteorology, China Meteorological Administration, Guangzhou Guangdong 510080;
3. National Numerical Prediction Center, Beijing 100081
关键词:
雷达回波; 松弛逼近方法(Nudging); 云微物理; GRAPES_3km模式
Keywords:
radar echo; relaxation approximation method(Nudging); cloud microphysics; GRAPES_3km mode
分类号:
P456
DOI:
10.19849/j.cnki.CN45-1356/P.2021.3.13
摘要:
利用ECMEF全球高分辨率模式资料，采用松弛逼近方法（Nudging）同化多普勒雷达反射率因子，通过在华南区域GRAPES_3km模式中对海南岛降水过程个例进行数值模拟，分析不同Nudging方法对模式预报效果的影响。结果表明：（1）采用Nudging同化方法可使背景场和观测反演的资料相协调，缩短模式热启动时间，可增加开始时段的降水量；（2）同化雷达反射率因子能够提高海南岛0~6h逐时降水评分，模拟值更接近实况观测；（3）同化后，华南区域GRAPES_3km模式能够捕捉到更多的中小尺度信息，可改善海南岛24h强降水的量级；（4）在初始场Nudging订正云水、雨水、水汽场等，其水凝物分布合理，降水预报效果最佳。
Abstract:
Using the ECMEF global high-resolution model data, the Doppler radar reflectivity factor was assimilated by the relaxation approximation method. Through numerical simulation of precipitation process in Hainan Island by GRAPES_3km model in South China, the influence of different Nudging methods on model forecasting effect was analyzed. The results show that(1) using Nudging assimilation method can coordinate the background field with the observed inversion data, shorten the thermal start-up time of the model and increase the precipitation in the beginning period.(2) Assimilated radar reflectivity factor can improve the hourly precipitation score of Hainan Island from 0 to 6 hours, and the simulated value is closer to the actual observation. (3) After assimilation, the GRAPES_3km model in South China can capture more small and medium-scale information, which can improve the magnitude of the 24-hour heavy rainfall in Hainan Island.(4) Nudging corrects the cloud water, rain water, and water vapor field in the initial field, the hydrometeor distribution is reasonable, and the precipitation forecast effect is the best.

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备注/Memo

备注/Memo:
收稿日期:2021-06-02。
基金项目:海南省气象局科研项目（hnqxSJ202110）、国家自然科学基金项目（41365005）
作者简介:钟有亮(1990-),男,硕士,助理工程师,主要从事数值天气预报研究。E-mail:459361483@qq.com
更新日期/Last Update: 1900-01-01