霰谱分布特征对强对流云高频微波亮温影响的模拟研究  

Simulation study on influence of graupel spectrum distribution characteristics on high frequency microwave brightness temperature of strong convective cloud

作　　者：杨素英[1] 王文君[1] 陆其峰 YANG Suying;WANG Wenjun;LU Qifeng(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology,Nanjing 210044,China;National Meteorological Centre,Beijing 100081,China)

机构地区：[1]南京信息工程大学中国气象局气溶胶与云降水重点开放实验室,江苏南京210044 [2]国家气象中心,北京100081

出　　处：《大气科学学报》2022年第2期312-320,共9页Transactions of Atmospheric Sciences

基　　金：国家重点研发计划项目(2017YFC1501404);公益性行业(气象)科研专项(GYHY201206002-3);国家自然科学基金资助项目(41575133)。

摘　　要：利用WRF中尺度模式和MWRT微波辐射传输模式,对一次理想对流单体云降水过程进行模拟,研究了霰谱参数对强对流降水云高频微波辐射亮温的影响。结果表明:霰谱参数的改变对对流单体云中冰相水凝物质量浓度分布和高频微波亮温均有影响。减小(增大)霰密度参数会导致霰谱宽度增大(减小),从而导致霰的碰并效率提高(降低),霰空间最大质量浓度增大(减小),而使冰晶和雪空间最大质量浓度减小(增大),最终导致最低亮温减小(增大);增大(减小)霰形状参数会导致霰谱宽度增大(减小),霰空间最大质量浓度增大(减小),而冰晶和雪的最大质量浓度减小(增大),最终使得模拟区域的最低亮温减小(增大)。区域最低亮温对不同霰谱参数或者相同霰谱参数的不同改变量的敏感程度不同。Using the WRF(Weather Research and Forecasting)model and the MWRT(Microwave Radiative Transfer)model,this paper simulated the cloud precipitation process of an ideal convective cell,and studied the influence of graupel spectrum parameters on the brightness temperature of high-frequency microwave radiation of strong convective precipitation cloud.Results show that the changes of graupel spectrum parameters have effects on the mass concentration distribution of ice phase hydrometeors and the high frequency microwave brightness temperature in convective cell cloud.Decreasing(increasing)of graupel density parameter will increase(decrease)the width of graupel spectrum,strengthen(weaken)the collision-coalescence growth efficiency of graupel,increase(decrease)the maximum mass concentration of graupel,and reduce(increase)the maximum mass concentration of ice crystal and snow,finally the minimum brightness temperature decreases(increases).Increasing(decreasing)of graupel shape parameter will increase(decrease)the width of graupel spectrum,increase(decrease)the maximum mass concentration of graupel,and decrease(increase)the maximum mass concentration of ice crystal and snow,finally the minimum brightness temperature decreases(increases)in the simulation area.In addition,the sensitivity of regional minimum brightness temperature to different graupel spectrum parameters or different changes of the same graupel spectrum parameters is different.

关 键 词：对流单体 霰谱分布 高频微波辐射 WRF模式 MWRT模式 

分 类 号：P426[天文地球—大气科学及气象学]