张鑫宇,陈敏,孙娟珍,范水勇,仲跻芹,张舒婷. 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, 79(1):104-118, 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 ground observation data assimilation scheme in WRF-DA
投稿时间:2020-04-17  修订日期:2020-09-21
DOI:10.11676/qxxb2021.004
中文关键词:  自动气象站观测数据  资料同化  更新方案
英文关键词:Automatic weather station observation data  Data assimilation  Update scheme
基金项目:国家重点研发计划项目(2018YFC1507105)
作者单位E-mail
张鑫宇 北京城市气象研究院, 北京, 100089  
陈敏 北京城市气象研究院, 北京, 100089 mchen@ium.cn 
孙娟珍 美国国家大气研究中心, 科罗拉多, 博尔德, 80307  
范水勇 北京城市气象研究院, 北京, 100089  
仲跻芹 北京城市气象研究院, 北京, 100089  
张舒婷 北京城市气象研究院, 北京, 100089  
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中文摘要:
      为了改善地面自动气象站观测数据在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合理性。并进一步分析了2017年7月5日个例试验结果及2017年7月整月的批量试验,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气象站观测资料的模式预报效果在前9 h温度和风速的预报误差明显降低,且在24 h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) observation data in the WRF-DA (Weather Research and Forecasting Model-Data Assimilation) system and improve the prediction of the numerical model, the ground observation data assimilation scheme in the WRF-DA is improved and an updated assimilation scheme is developed. Considering the impact of terrain height difference on the assimilation effect, the correctness of ground elements to the model surface are modified in the assimilation scheme to improve the accuracy of the values of ground temperature and wind speed. Analysis of the results of a real-data case experiment on 5 July 2017 and the results of batch experiments for the entire month of July 2017 indicates that compared to the results of the experiments with assimilation using the original scheme, the forecast errors of the experiments using the updated scheme are significantly reduced in the first 9 h. The advantage of the updated scheme can be maintained for 24 h. It shows that the updated scheme has obvious positive effects on the assimilation of ground temperature and wind speed.
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