Ground-based Observations And Satellite Toms Observations Of The Global Total Atmospheric Ozone Comparative Analysis

This study has compared ground-based and satellite data of 139 ozone observation stations.Using this two different sources ozone data ,we have compared their monthly and yearly mean offsets based on the same station and the same day data to access differences between different methods for measuring total atmospheric ozone over the globe.Satellite data is available from National Aeronautics and Space Administration,America,which has two versions,that is version 7 and version 8.Ground-based data is availble from World Ozone Ultraviolet Radiation Data Center(WOUDC).This comparison would offer some reference about how to analyse the long-term trend and short-term variation rule of total ozone correctly.Applying statistical regression method ,we analyse the monthly average variations and seasonal variations of their longitudinal differences.lt is shown that the differences at high latitudes(6~7%) are larger than at low latitudes(3~4%),and that at high latitudes the variation trend of differences is more complicated than at low latitudes.We make ground-based data availble from different instruments compare with TOMS data from two satellites, and analyse their biases and deviations.The results show that the data from Dobson stations and Brewer stations is coincident to TOMS data,but the accuracy of Filter ozonemeter is lower than Dobson and Brewer instruments.Especially,comparing with the data from Earth Probe satellite,only 37% of all Filter stations have less than 2% monthly mean differences.