张鑫宇,陈敏. 2021. WRF-DA中地面观测资料同化方案的改进与应用[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.004
WRF-DA中地面观测资料同化方案的改进与应用
Improvement and Application of the Assimilation Scheme of Ground Observation Data in WRF-DA
投稿时间:2020-04-10  修订日期:2020-09-02
DOI:10.11676/qxxb2021.004
中文关键词:  自动站数据,资料同化,更新方案
英文关键词:Automatic weather station data,Data assimilation,Update scheme
基金项目:国家重点研发计划
作者单位E-mail
张鑫宇 北京城市气象研究院 xyzhang@ium.cn 
陈敏 北京城市气象研究院 mchen@ium.cn 
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全文下载次数: 54
中文摘要:
      为了改善地面自动站(简称自动站)观测数据在WRF-DA(The Weather Research and Forecasting Model-Data Assimilation)系统中的同化应用效果,提高数值模式的预报性能,对WRF-DA地面资料同化方案中温度和风速订正方案进行改进,形成地面资料同化更新方案。通过考虑地形高度差异对同化效果的影响,调整同化方案中地面要素由实际地形高度订正到模式高度的同化订正方案,提升地面观测温度及风速订正值的准确性。并进一步分析2017年7月5日个例试验结果以及2017年7月整月的批量试验,结果发现相比于使用原方案同化后的预报效果,选取更新方案同化地面自动站的模式预报效果在前9小时的温度和风速的预报误差明显降低,且在24小时预报时效内,更新方案对于模式预报均起到改善作用。
英文摘要:
      In order to improve the assimilation effect of automatic weather station (AWS) data in the WRF-DA (The Weather Research and Forecasting Model-Data Assimilation) system and improve the prediction of the numerical model, it ameliorates assimilation scheme of ground data in the WRF-DA, then forms an update assimilation scheme. Considering the effect of terrain height difference on the assimilation effect, it adjusts the assimilation scheme which corrects the ground elements to the model surface to improve the accuracy of the values of ground temperature and wind speed. Analysis of the results of a real case experiment on July 5, 2017 and the results of a batch experiments for the entire month of July 2017, it found that the forecast errors of the experiment using the update scheme are significantly reduced in the first 9 hours, comparing to the results of the experiment after assimilation with the original program. The advantage of the updated scheme can be maintained for 24 hours. It shows that the update scheme has obvious positive effects on the assimilation of ground temperature and wind speed.
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