Ozone Low and Surface Heating over Large Scale Topography
大尺度山地上空的臭氧低值及地面加热

The variation and distribution of ozone are analyzed using TOMS data on board Nimbus-7 Contribution of large-scale topography (i e the Tibet, the Rocky and the Andes) to ozone deficit is noticed in this study The global distribution and zonal deviation of total ozone show obvious low ozone perturbation over the three major mountainous regions with the strongest one over the Tibet The seasonal variation of area averaged ozone demonstrates a spring maximum and autumn minimum ozone over the three regions The area weighted mean of zonal deviation reveals maximum local ozone deficits in spring and early summer over the mountainous regions After analysis on the relation between the ozone deficit and surface heating to the atmosphere over the Tibet, the heating is recognized as the main cause to the low ozone perturbation and local deficit In addition, the ground-atmosphere sensible heat is the dominating component in causing the ozone deficit over large-scale topography