青藏高原地区一次强对流过程中UTLS大气成分分析  

Variation of Atmospheric Composition in UTLS during a Strong Convection Process in Tibetan Plateau

作　　者：孙一 陈权亮 

机构地区：[1]成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,成都610225

出　　处：《气象科技》2017年第6期1083-1089,共7页Meteorological Science and Technology

基　　金：国家自然科学基金(41405031;91537214)资助

摘　　要：青藏高原是对流层水汽和污染物进入平流层的一个重要通道,这些大气成分会对全球气候产生重要影响。利用MLS探测资料和ERA-Interim资料,对2012年7月5日发生在青藏高原中部的一次强对流活动中对流层上部平流层下部(UTLS)H_2O、O_3、CO和IWC的分布特点进行分析,并通过Wei公式估算穿越对流层顶的臭氧和水汽通量。分析结果表明:(1)O_3混合比在100hPa附近相对多年平均略微增加,从0.3×10^(-6)(V)增加到0.9×10^(-6)(V);CO混合比在150hPa以下最大值增加了0.08×10^(-6)(V);H_2O混合比在215hPa附近增加了80×10^(-6)(V);IWC在对流过程中增加明显,在215hPa处的含量最大达到了0.027g/m^3,比多年平均值增加2倍多。(2)对流活动开始前,向上穿过对流层顶的运动逐渐增强,且总的臭氧和水汽通量输送主要由垂直方向的瞬时运动变化贡献。因此高原上的强对流活动对对流层低层大气的抬升作用会使UTLS的大气成分发生相应变化。The Tibetan Plateau is an important channel of water vapor and pollutants from troposphere into stratosphere,and these atmospheric constituents have important impact on the global climate.By using MLS and ERA-Interim data,the distribution of atmospheric composition,including H2O,O3,CO,and IWC during a strong convective weather process occurring in the central Tibetan Plateau is analyzed.With the Wei formula to estimate the H2O and O3 flux crossing tropopause.Results indicate：（1）O3 mixing ratio increased from 0.3×10-6（V）ppmv to 0.9×10-6（V）at 100 hPa compared with the average;CO increased 0.8×10-6（V）below 150 hPa;H2O by 80 ppmv at 215 hPa and IWC significantly increased more than double to 0.027 g/m3.（2）Before the convective activity began,the upward movement gradually strengthened,and total O3 and H2O flux were contributed by the vertical instantaneous movement.Thus the lifting effect of the strong convection to the atmosphere in UTLS（Upper Troposphere and Lower Stratosphere）made atmospheric composition change accordingly over the Tibetan Plateau.

关 键 词：青藏高原 强对流 大气成分 MLS UTLS 

分 类 号：X51[环境科学与工程—环境工程]