边界层参数化方案对华南一次暖区强对流过程的模拟影响研究  

The effects of boundary layer parameterization schemes on the simulation of a strong warm-sector convective process over South China

作　　者：谢文锋 张有洋 XIE Wenfeng;ZHANG Youyang(Middle South Regional Air Traffic Management Bureau of CAAC,Guangzhou 510405,China)

机构地区：[1]中国民用航空中南地区空中交通管理局,广州510405

出　　处：《气象研究与应用》2024年第1期72-77,共6页Journal of Meteorological Research and Application

摘　　要：基于天气研究和预报模式(WRF)中尺度数值模式,比较分析四种边界层参数化方案(YSU、MYJ、MYNN、 ACM2)对华南暖区强对流过程模拟的影响。结果表明:(1)四个方案均模拟出广东区域午后有强对流天气发展,但模拟的平均降水量比实况偏小,最大降水强度出现时间滞后1~2 h。(2)四个方案模拟的气温垂直分布与实况非常接近,模拟的850 h Pa以下的低层湿度整体偏大,而模拟的800~950 h Pa风速整体偏小。(3)相比之下,YSU非局地闭合方案模拟的对流回波形态整体与实况最接近,MYJ方案对低层区域800~950 h Pa的风速模拟效果更好,且模拟的较强降水出现时段更接近实况。(4)MYJ和MYNN虽同为局地闭合方案,但模拟结果有较大差异,MYNN方案模拟的低层风速、地面感热通量和潜热通量要明显小于MYJ方案,而YSU和ACM2方案模拟结果差异相对较小。Based on the WRF mesoscale numerical model,the effects of four boundary layer parameterization schemes(YSU,MYJ,MYNN,ACM2)on the simulation of a strong warm-sector convection process in South China are compared and analyzed.The results show that:(1)all four schemes can simulate the development of strong convective weather in Guangdong in the afternoon,but the simulated average precipitation is smaller than the actual situation,and the simulated maximum precipitation intensity appears with a time lag of 1~2 hours.(2)The vertical distribution of temperatures simulated by the four schemes are very close to the actual situation.The simulated humidity in the low level below 850 hPa is generally larger,while the simulated wind speeds between 800~950 hPa are small.(3)In contrast,the convective echo pattern simulated by the non-local closure schemes YSU is the closest to the actual situation,while the MYJ scheme is more effective in simulating the wind speeds in the low-level region from 800~950 hPa,and the simulated time of occurrence of heavier precipitation is closer to the actual situation.(4)Although MYJ and MYNN are both local closure schemes,there are significant differences in their simulation results.The simulated lowlevel wind speeds,surface sensible heat fluxes,and latent heat fluxes of MYNN scheme are significantly smaller than those of the MYJ scheme,while the difference between the simulation results of YSU and ACM2 schemes is relatively small.

关 键 词：暖区 强对流 边界层方案 数值模拟 

分 类 号：P458[天文地球—大气科学及气象学]