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《Journal of Tropical Meteorology》 2017-06
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THE EFFECT OF BOUNDARY LAYER PARAMETERIZATION SCHEMES ON THE SIMULATION OF TURBULENT EXCHANGE PROPERTIES OF A MEI-YU RAINSTORM

SHEN Xin-yong;MA Zheng;GUO Chun-yan;LI Xiao-fan;Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change,Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,NUIST;Key Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmospheric Physics, CAS;Inner Mongolia Meteorological Service Center;School of Earth Sciences, Zhejiang University;  
Different planetary boundary layer parameterizations in the WRF model are used to simulate a heavy rainfall in Yangtze-Huaihe basin during July 3—5, 2007. The results indicate that the use of different parameterization schemes has impact on the distribution and intensity of the rainstorm. The differences in precipitation rate and surface factors become larger as the rainstorm goes on. The differences in the vertical distribution of horizontal wind fields, vertical velocity and potential pseudo-equivalent temperature caused by the use of different schemes, have direct effect on the simulation of the rainstorm. The vertical distribution of turbulent kinetic energy(TKE) different from the clear state is simulated well by all schemes,with positive effect from wind shear and TKE transport and negative from buoyancy. The characteristics of turbulent exchange simulated by different schemes correspond well to those of TKE. Compared with other schemes, MYJ simulated weaker TKE development and turbulent exchange, and weaker vertical transport of heat fluxes. GBM predicted weaker exchange within the boundary layer, and much larger exchange coefficients above PBL. The vertical transport of heat flux at higher levels simulated by GBM showed obvious errors and influenced the simulation of meteorological elements in the precipitation area. Thus,further improvement is still needed. As to this case, the MYNN Level-3 scheme performs the best simulation.
【Fund】: 国家自然科学基金项目(41375058;41530427;41475039);; 国家重点研发计划(2016YFC0203301);; 国家重点基础研究发展计划973项目(2015CB453201);; 江苏省自然科学基金重点项目(BK20150062)共同资助
【CateGory Index】: P458.121.1
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