青藏高原和伊朗高原上空臭氧变化特征及其与南亚高压的关系  

Ozone Variations over the Tibetan and Iranian Plateaus and Their Relationship with the South Asia High

作　　者：周任君[1] 陈月娟[1] 

机构地区：[1]中国科学技术大学地球和空间科学学院,安徽合肥230026

出　　处：《中国科学技术大学学报》2005年第6期899-908,共10页JUSTC

基　　金：国家自然科学基金资助项目(40375012).

摘　　要：采用TOMS、HALOE和SAGEⅡ臭氧卫星观测资料,对青藏高原上空臭氧的垂直结构和变化特征以及伊朗高原臭氧低值中心做了相应的研究,并且对两个高原臭氧低值中心进行了对比.结果表明:夏季伊朗高原同青藏高原一样存在臭氧低值中心;青藏高原和伊朗高原上空臭氧含量的变化与同纬度带其他地区相比,在12～22km或120～30 hPa这个气层中减少最明显,在此气层中伊朗高原上臭氧的减少比青藏高原上的更厉害.进一步采用NCEP/NCAR再分析资料分析了亚洲上空位势场和位温的变化及其与臭氧变化的关系,结果显示青藏高原和伊朗高原上空臭氧含量的变化和南亚高压有着密切的关系.南亚高压正好处在青藏高原和伊朗高原上空,夏季当南亚高压中心偏伊朗高原时,伊朗高原上空臭氧总量比多年平均值低,6、7月份随南亚高压中心位置的变化,伊朗高原上空臭氧总量变化明显,而青藏高原上空臭氧总量变化不是很明显.利用此区域夏季等位温面的变化对上述关系的机理进行了初步的探讨.The TOMS data shows that in summer an ozone low center also exists over the Iranian Plateau, so the vertical distributions and variation characters of ozone over the Iranian Plateau are discussed in this paper along with the analysis of those over the Tibetan Plateau by using the TOMS, HALOE and SAGE Ⅱ data. The results show that the largest ozone deficit is found in 12-22 km a. s. 1. （120-30 hPa） over the Tibetan Plateau and the Iranian Plateau in summer compared with the vertical ozone distribution in the non-mountainous areas at the same latitudes, and that the ozone deficit over the Iranian Plateau is larger than that over the Tibetan Plateau in this layer. Based on the NCEP/ NCAR monthly mean reanalysis data, the variations of geopotential height and potential temperature over South Asia and their relationships with ozone variations are analyzed in this paper. The results show that there is a close relationship between the ozone variations over the plateaus and the South Asia High（SAH）. When the position of the SAH center inclines to Iran, the total ozone amount over the Iranian Plateau is less than the annual mean value. By analyzing the variations of the equipotential temperature surfaces over the plateaus, the effect of the SAH on the ozone low center is discussed.

关 键 词：青藏高原 伊朗高原 臭氧 南亚高压 

分 类 号：P434[天文地球—大气科学及气象学]