气象科学2024，Vol.44Issue(6)：1027-1037,11.DOI:10.12306/2022jms.0090
基于ERA5资料的分析增量更新初始化对华南一次飑线过程预报的影响
Impact of incremental analysis update initialization with ERA5 data on the forecasts of a squall line event in southern China
摘要
Abstract
In this study,the impact of Incremental Analysis Update(IAU)initialization on the forecasts of a squall line event that occurred in southern China on 9-10 April 2016 was investigated.The ERA5 global reanalysis was incorporated into the high-resolution regional model WRF through the IAU method.Results show that:(1)IAU initialization can effectively reduce the imbalance caused by the introduction of low-resolution global reanalysis field into high-resolution regional model and retain the microphysical information in the background field of regional model,reducing the model spin-up time.(2)Compared with the cold start run initialized directly by the ERA5,the linear structure and precipitation distribution of the squall line system using IAU initialization are closer to the observations.(3)Further diagnostics indicate that the improvement of the squall line forecasts using IAU initialization is mainly related to the faster development of cold pool caused by retaining the microphysical information in the background field of regional model and more favorable stratification conditions for the development of squall line corrected by the IAU increment.关键词
分析增量更新/高分辨率区域模式/飑线/ERA5Key words
IAU/high-resolution regional model/squall line/ERA5分类
天文与地球科学引用本文复制引用
高彦青,王晓峰,张蕾,张赟程..基于ERA5资料的分析增量更新初始化对华南一次飑线过程预报的影响[J].气象科学,2024,44(6):1027-1037,11.基金项目
国家重点研发计划资助项目(2017YFC1501902) （2017YFC1501902）
上海市科委自然科学基金资助项目(21ZR1457700) （21ZR1457700）
