青藏高原地区一次深对流活动对平流层——对流层物质交换影响的模拟研究  

Simulation Study on the Impact of Deep Convection on Stratosphere-Troposphere Exchange over the Qinghai-Xizang Plateau

作　　者：刘迪 田文寿[1] 雒佳丽[1] 张如华 LIU Di;TIAN Wenshou;LUO Jiali;ZHANG Ruhua(Key Laboratory of Semi-Arid Climate Change of Ministry of Education,College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000)

机构地区：[1]兰州大学大气科学学院/半干旱气候变化教育部重点实验室,兰州730000

出　　处：《大气科学》2024年第4期1329-1344,共16页Chinese Journal of Atmospheric Sciences

基　　金：中国科学院战略性先导科技专项(A类)项目XDA17010106;国家重点研发计划项目2018YFC1505703;甘肃省自然科学基金项目20JR10RA626。

摘　　要：利用WRF-Chem模式分析了2010年8月12日发生在青藏高原东南部的一次深对流过程中的平流层—对流层物质交换(STE)过程及其影响机制。结果表明,此次深对流系统具备穿透性对流特征,强上升气流能够直接将近地面含高浓度CO和低浓度O_(3)的空气输送至低平流层,使低平流层CO浓度升高、O_(3)浓度降低。同时,深对流活动激发了较强的湍流混合过程,在深对流活动结束后的3~4小时内,湍流混合作用导致上对流层下平流层(UTLS)区域持续发生STE过程,将对流层的冰晶、CO和O_(3)输送至低平流层,但受凝结脱水作用影响,湍流过程向低平流层传输的水汽减少。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 WRFChem 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 O_(3) concentration near the ground into the lower stratosphere.Thus,in the lower stratosphere,the concentrations of CO and O_(3) 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 O_(3) 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 

分 类 号：P445[天文地球—大气科学及气象学]