北京地区对流层顶变化及其对上对流层/下平流层区域臭氧变化的影响

根据2001～2003年期间获得的大气臭氧探空资料,揭示了北京地区上空对流层顶高度的某些变化特征及其对上对流层(UT)和下平流层(LS)区域内大气臭氧含量变化的影响.结果显示:北京地区上空对流层顶高度的平均值约11.1 km,其变化范围为7.7～14.4 km,臭氧层顶始终处在对流层顶下方约0.9 km高度处.对流层顶高度变化与臭氧总量变化之间的关系相对较弱.通常情况下,LS中的臭氧积分量明显高于UT中的相应值,并且二者呈相反的季节变化特征.北京地区上空仲夏和初秋季节第一对流层顶出现的频数明显减少,在第一对流层顶消失的情况下,LS中的臭氧积分量明显减少,而UT中的臭氧积分量明显增加,臭氧量减少最多发生在200～100 hPa层次中,而臭氧量增幅最大的层次是400～250 hPa.

Variation of the Tropopause Height and Its Influence on Ozone Variation in Upper Troposphere/Lower Stratosphere over Beijing

Based on ozonesonde data for 20012003,some variation characteristics of the tropopause height and its influence on ozone variation in upper troposphere/lower stratosphere(UT/LS) region over Beijing are discussed.Results show that the average tropopause height over Beijing is about 11.1 km with variation range of 7.7(14.4 km),the ozonopause is located,on average,at 0.9 km below the tropopause height throughout the year.In general,integrated ozone content in the LS is much larger than that in the UT,and opposite seasonal variation(appears.) The negative relation between the tropopause height and total ozone content is relatively weak for Beijing area.Appearance frequency of the tropopause decreases evidently in midsummer and early autumn.In the case of tropopause absence,clear ozone decrease in the LS and ozone increase in the UT are observed.The maximum ozone(decrease) happens in the layer of 200100 hPa,while the maximum ozone increase appears in the layer of 400250 hPa.