Impact of radar data assimilation on a squall line over the Yangtze–Huaihe River Basin with a radar reflectivity operator accounting for ice‐phase hydrometeors
Impact of radar data assimilation on a squall line over the Yangtze–Huaihe River Basin with a radar reflectivity operator accounting for ice‐phase hydrometeors
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DOI：
10.1002/met.1967
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发表时间：
2021-03
影响因子：
2.7
通讯作者：
Feifei Shen;Dongmei Xu;Hong Li;Ruixia Liu
中科院分区：
文献类型：
--
作者：
Feifei Shen;Dongmei Xu;Hong Li;Ruixia Liu
利用带冰相流星的雷达反射率观测算子同化了2009年6月14日安徽、江苏两省中国地区的一条锋线的雷达观测资料。应用了三维变分(3DVAR)资料同化系统和天气研究与预报(WRF)模式。通过分析锋线不同阶段的气象条件，研究了同化雷达径向速度和反射率的影响。结果表明，雷达资料同化试验在一定程度上调整和改进了采用循环资料同化策略的锋线初始场。冰相水流星观测算子的使用，使雷达综合反射率的分析和预报有了明显的提高。从地面和高层的风场、雷达反射率、地面扰动位温和地面扰动气压等方面说明了改进的意义。此外，使用冰相水流星雷达观测算子后，无论是位置还是强度，降水预报技术都有了明显的提高。
A radar reflectivity observation operator with ice‐phase hydrometeors was employed for the assimilation of the real radar observations of a squall line on June 14, 2009, over Anhui and Jiangsu provinces in China. The three‐dimensional variational (3DVAR) data‐assimilation system along with the Weather Research and Forecasting (WRF) model was applied. The impact of assimilating radar radial velocity and reflectivity is investigated by analysing the meteorological conditions for different stages of the squall line. The results show that the radar data‐assimilation experiments adjust and improve the initial fields to some extent for the squall line with the cycling data‐assimilation strategy. The analysed and predicted radar composite reflectivity is significantly improved with the use of the ice‐phase hydrometeors observation operator. The improvements are illustrated in terms of the wind fields for both the surface and upper level, the radar reflectivity, the surface perturbation potential temperature and the surface perturbation pressure. In addition, the forecast skills of the precipitation are improved noticeably for both the location and the intensity after using the ice‐phase hydrometeors radar observation operator.