Hadley环流上升支特征及其与东亚臭氧变化的关系

 利用NCEP/NCAR再分析风场资料和TOMS臭氧总量资料以及ECMWF臭氧混合比资料,用叠加计算方案分析了1992~2002年整10 a的平均经圈环流(MMC)气候态特征;在此基础上定义了Hadley环流上升支强度指数(HAI),研究Hadley环流上升支与东亚地区臭氧的相关关系.结果表明:南、北半球的2个Hadley环流圈的公共上升支具有明显的季节特征;冬、夏HAI(WHAI/SHAI)均表现出明显的年变化,WHAI在2月最强,SHAI在8月最强,WHCI与其所处高度的负相关性较夏季好.分析还指出,Hadley环流上升强度越强,同期东亚相对应的Hadley环流上升极值高度处对流层臭氧浓度越小.

Features of Hadley circulation ascending branch and its relation to the variation of ozone in East Asia

Based on the NCEP/NCAR reanalyzed wind data,TOMS ozone data and ECMWF ozone mass mixing ratio;the MMC climatic state during 1996-2006 is investigated by using a superposition method.At the same time,the intensity index of Hadley circulation ascending branch (HAI) is defined and the relationships between Hadley circulation ascending branch and ozone in East Asia is discussed.It is indicated that,the joint ascending branch of the Northern and Southern Hadley circulation has a marked seasonal variability.HAI in winter and in summer (WHAI/SHAI) both shows obvious annual change.WHAI is the largest in Febrary and SHAI is the largest in August.There exist some negative correlation between the WHAI/SHAI and their altitude,and the WHAI-altitude correlation is better.The results also show that:Accompanying the strengthened Hadley circulation ascendance,the troposphere ozone mass mixing ratio of the corresponding center of Hadley ascending branch in East Asia will reduce.