In this study,the characteristics and mechanisms of the stratosphere-troposphere exchange(STE)in deep convection over the southeastern part of the Qinghai-Xizang Plateau on August 12,2010,were analyzed using the WRF-Chem model.It was revealed that the convection has the characteristics of penetrating convection,and the strong updraft in the convection can directly transport the air with high CO concentration and low O3 concentration near the ground into the lower stratosphere.Thus,in the lower stratosphere,the concentrations of CO and O3 increased and decreased,respectively.The deep convection also induced a strong turbulent mixing process,causing the continuous STE in the upper troposphere-lower stratosphere region within 3-4 h after the end of deep convection,transporting ice crystals,CO,and O3 from the troposphere to the lower stratosphere.The water vapor that entered the lower stratosphere via the turbulent mixing process was reduced due to condensation and dehydration.
关键词
平流层—对流层物质交换(STE)/深对流/青藏高原/WRF-Chem模式
Key words
Stratosphere-Troposphere Exchange(STE)/Deep convection/Qinghai-Xizang Plateau/WRF-Chem model
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基金项目
中国科学院战略性先导科技专项(A类)(XDA17010106)
国家重点研发计划(2018YFC1505703)
甘肃省自然科学基金项目(XDA17010106)
National Key Research and Development Program of China(2018YFC1505703)
Natural Science Foundation of Gansu Province of China(20JR10RA626)
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