2种多普勒雷达风资料同化效果的比较  

Comparison of Assimilation Effects of Two Doppler Radar Wind Data

作　　者：胡向军[1] 万齐林[2] 杨晓军[1] 黄燕燕[2] 陈子通[2] 张志达 徐丽丽 无 Hu Xiang-jun(Lanzhou Central Meteorological Observatory,Lanzhou,Gansu 730020)

机构地区：[1]兰州中心气象台,甘肃兰州730020 [2]中国气象局广州热带海洋气象研究所,广东广州510080 [3]兰州大学大气科学学院半干旱气候变化教育部重点实验室,甘肃兰州730000

出　　处：《农业灾害研究》2023年第6期116-118,共3页Journal of Agricultural Catastrophology

基　　金：国家自然科学基金(41675099)。

摘　　要：基于Grapes模式及其三维变分同化系统(Grapes-3DVar),采用同化背景切向风联合雷达径向风和“视风速”联合雷达径向风的2种不同方法,对2006年登陆台风“碧利斯”进行数值试验,研究同化效果的差异。结果表明:2种同化方法都能改善模式初始场,使模式模拟的24 h降水更合理。“视风速”联合雷达径向风同化比背景切向风联合雷达径向风同化所获得的同化风场风速增量更大,而且“视风速”联合雷达径向风同化所获得的降水强度也更大。Based on the Grapes model and its three-dimensional variational assimilation system(Grapes-3DVar),two different methods of assimilating background tangential wind combined with radar radial velocity and“seeable velocity”combined with radar radial velocity were used to conduct numerical experiments on landing typhoon Bilis in 2006 to study the difference of assimilation effect.The assimilation of the wind field and forecast of precipitation are discussed.The results showed that both assimilation methods can improve the initial field of the model,and then make the 24-hour precipitation simulated by the model bigger and more reasonable.The wind speed increment of the assimilation wind field obtained by"seeable velocity"combined with radar radial velocity assimilation was larger than that of background tangential wind combined with radar radial velocity assimilation,and the precipitation intensity obtained by“seeable velocity”combined with radar radial velocity assimilation was also larger.

关 键 词：雷达资料同化 背景切向风 径向风 视风速 

分 类 号：P412[天文地球—大气科学及气象学]