陆面过程参数化对宁波地区雷暴过程模拟的影响  

Impact of land surface parameterizations on simulated thunderstorm process over the Ningbo area

作　　者：汪雅[1,2] 苗峻峰[1] 谈哲敏[3] 

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044 [2]上海市气象局,上海200030 [3]南京大学中尺度灾害性天气教育部重点实验室,江苏南京210093

出　　处：《大气科学学报》2015年第3期299-309,共11页Transactions of Atmospheric Sciences

基　　金：公益性行业(气象)科研专项经费项目(GYHY201006004)

摘　　要：利用耦合复杂程度不同的陆面过程参数化方案(Noah、RUC)的新一代中尺度数值模式WRF,对2006年6月24日发生在宁波地区的一次典型的雷暴过程进行了数值模拟试验。结果表明:对于雷暴发生前期近地面热力、动力场的特征,Noah方案的模拟较为逼真,RUC方案没有反映出下垫面覆盖的多样性以及城市下垫面的影响,城乡之间差异不明显;Noah方案模拟的雷暴启动、发展过程与观测较为一致,RUC方案较好地描述出了演变过程中的关键阶段(3次合并过程);由于参数化所考虑的要素和物理过程存在一定差异,Noah方案在对降水的强度、降水中心位置的模拟方面具有一定优势;雷暴的持续时间对陆面过程参数化方案的选择比较敏感,两个方案所模拟的雷暴过程持续时间不同程度地长于实际雷暴持续时间;无论是哪种下垫面覆盖类型,白天Noah方案模拟的感热通量均大于RUC方案,而Noah方案模拟的潜热通量均小于RUC方案。The newgeneration mesoscale model WRF is used to simulate a typical thunderstorm process in Ningbo area on 24 June 2006,and the impacts of land surface parameterization schemes（ Noah and RUC） on numerical simulation of the thunderstorm process are tested. The results showthat,for surface thermodynamic field before the thunderstorm happened,the simulated results with Noah scheme are more close to the observations. However,with RUC scheme,the simulated results do not reflect the diversity of underlying surface coverage and the impacts of city underlying surface,and the difference between rural and urban areas is not obvious. The start and development processes simulated by Noah scheme are more reasonable,and the results simulated by RUC scheme describe the key stages in the evolution process of thunderstorm well,such as three merging processes. Because the considered factors and physical process parameterizations are different,the strength and center of accumulated precipitation simulated by Noah scheme are more consistent with the observations than those simulated by RUC scheme. The duration of thunderstorm is strongly sensitive to land surface process parameterization,andboth durations simulated by the two schemes are longer than actual duration of the thunderstorm to different degree. Whatever the land cover category in Ningbo area,the sensible heat flux（ latent heat flux）simulated by Noah scheme is greater than（ less than） that simulated by RUC scheme during the day.

关 键 词：雷暴过程 陆面过程参数化 Noah方案 RUC方案 数值敏感性 

分 类 号：P446[天文地球—大气科学及气象学]