Solar cycle signal of tropospheric ozone over the Tibetan Plateau
青藏高原对流层臭氧含量变化的太阳周期活动信号分析

Tropospheric column ozone data during 1979 to 1992 over the Tibetan Plateau and Solar flux F10.7 index data at the same period, are used to evaluate the relationship between tropospheric ozone variation and solar flux change. It is shown that there exists a solar cycle changing trend in the tropospheric ozone at this region. The estimated changes in tropospheric and stratospheric and column total ozone over a solar cycle are representively 1.31, 4.97 and 6.628 Dobson Units (DU), or 4.07%, 2.04% and 2.28% from solar minimum to solar maximum. This is quite different from that trend over tropic Pacific region discovered by Chandra et al. 1999. In the tropic Pacific region, a negative changing trend was found. There are at least two aspects should be put consideration in explain the difference. One is the different component of NOX and water vapor in the background atmosphere over those two regions. The other is the continually stratosphere-troposphere exchange in the Tibetan Plateau may resulting in some ozone is sent to troposphere from stratosphere.