Effects of Cloud Condensation Nuclei Concentration on Precipitation in Convection Permitting Simulations of a Squall Line Using WRF Model:Sensitivity to Cloud Microphysical Schemes
Effects of Cloud Condensation Nuclei Concentration on Precipitation in Convection Permitting Simulations of a Squall Line Using WRF Model:Sensitivity to Cloud Microphysical Schemes
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发表时间：
2012
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通讯作者：
Xu Haiming
中科院分区：
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作者：
Xu Haiming
利用天气研究与预报模式研究了云凝结核（CCN）浓度对广东飑线相关降水的显深对流模拟的影响。进行了四组模拟，每组采用不同的体微物理方案（Morrison, thompson - 09， thompson - 07和WDM6），分别由低、中、高CCN浓度的三个成员组成。比较了四组模拟中CCN浓度变化对深对流区、层状云区和浅对流区及其区域内地表降雨率的影响。然后分析了模拟过程中动力环流的微物理过程和强度。结果表明：(1)由于微物理过程与CCN浓度之间存在直接或间接的关系，各种微物理过程之间存在复杂的联系，微物理过程与动力过程之间存在非线性耦合，四组模拟对CCN降水的影响既有相似之处，也有差异。(2)模拟的ccn降水影响以Thompson09和Thompson07方案最显著，WDM6方案最不显著。(3)模拟前期降水延迟减弱，后期降水量减少，而ccn降水影响在模拟飑线成熟阶段更为复杂。
Effects of cloud condensation nuclei(CCN) concentration on explicit-deep convection simulations of precipitation associated with a squall line that developed in Guangdong Province,China are investigated using the Weather Research and Forecasting model.Four groups of simulations are conducted,each with a different bulk microphysical scheme(Morrison,Thompson09,Thompson07,and WDM6) and consisting of three members with low,median,and high CCN concentration,respectively.Changes caused by the CCN concentration variation in the surface rainfall rates within the regions of deep convection,stratiform cloud,and shallow convection,as well as in their areas,are compared among the four groups of simulations.Then the microphysical processes and strength of dynamical circulation in the simulations are examined.It is found that:(1) The CCN-precipitation impacts among the four groups of simulations exhibit both similarities and differences,due to the direct or indirect relationships between the microphysical processes and CCN concentration,the complicated linkage among various microphysical processes,and the nonlinear coupling between microphysical and dynamical processes.(2) The simulated CCN-precipitation impacts are the most significant with the Thompson09 or Thompson07 scheme and the least notable with the WDM6 scheme.(3) In these experiments,precipitation is delayed and weakened during the early stage of the simulations and rainfall amount is also decreased during the late stage,while the CCN-precipitation impacts are more complicated during the mature stage of the simulated squall line.