中文摘要：

利用等熵坐标下的Wei公式对青藏高原及附近地区穿越动力学和热力学定义下对流层顶的质量和臭氧通量的时空分布变化进行了计算分析。结果表明,采用这两种定义下的对流层顶时,穿越对流层顶的质量和臭氧通量都表现出在热带纬度带为TST通量,到了副热带则转换为STT通量。由于热力学定义下的对流层顶位置稍高,造成了穿越热力学对流层顶的质量和臭氧通量变化幅度大于动力学对流层顶的情况。另外,还发现在所研究的区域穿越对流层顶质量和臭氧通量交换具有明显的年代际变化特征,在1958—2001年时段内交换是先减弱后增强。青藏高原南部及南侧地区向上的质量和臭氧输送经历了逐渐减弱过程,青藏高原北部地区向下的质量和臭氧通量交换也表现为逐渐减弱的过程,这些区域作为通量输送的通道作用是在减弱的。而接近青藏高原西北侧的塔里木盆地附近的向上输送则是逐渐加强的,表明这一区域交换通道作用在青藏高原及附近地区的质量和臭氧交换过程中起着越来越重要的作用。

英文摘要：

Using the Wei-formula in isentropic coordinates,mass and ozone fluxes cross the dynamical and thermal tropopauses over the Qinghai-Xizang Plateau（QXP） and its surrounding areas were calculated and comparative analyzed.The results show that when the two kinds of tropopause are used,the mass and ozone fluxes cross tropopause in tropical latitudes are TST flux areas,and convers to the STT flux in the sub-tropics.Because of the height of thermal tropopause is higher than that of dynamical one,the change of mass and ozone fluxes cross the thermal tropopause is greater than that of cross the dynamical tropopause.In addition,it is also found that exchange of mass and ozone fluxes cross tropopause in this area show the significent interdecadal variation,the trend in 1958_2001 shows that the situation of mass and ozone flux exchanges over the QXP is first to weakening after enhancement.The upward mass and ozone of transmission over the southern QXP and on its south side have downword the process of gradually weakened,which indicates that these areas in the role of the mass and ozone exchange channel gradually weaken;downward mass and ozone fluxes over the northern QXP showed gradually weakened process,here the role of the transmission channel is also weakened.It indicates that these regions play an increasingly important role in the process of mass and ozone exchanges.