Comparison of groud-based and TOMS-EP total ozone data for antarctica and Northern Midlatitude Stations (1996–1999)

Abstract

A comparison of the total ozone data by the TOMS-EP satellite and ground based Dobson spectrophotometer (Ukrainian Antarctic Station ‘Akademik Vernadsky’, 65.25S, 64.27W), and M124 UV filter radiometer (Kyiv University Observatory ‘Lisniky’, 50.30N, 30.53E) measurements was made. Comparison of the TOMS-EP and Dobson daily total ozone values for Antarctic Peninsula gives a decrease of the mean relative difference from 3.1% in 1996/1997 to 1.4% in 1998/1999. Comparison of the TOMS-EP and M124 data gives a changing relative difference of near zero (from −0.4% to 0.11% in 1997–1999). Days with cloudless sky and with totally overcast sky were selected from the data sets. The mean relative difference of TOMS — Dobson data changed during 1996–1999 for cloudless days from 6% to 11% and for cloud cover from −0.5% to −1.3%. Northern midlatitude observations give a relative difference of TOMS — M124 data for cloudless sky of 0.15% and for totally overcast sky of −3.5%. This comparison shows that differences in cloud cover influence the total ozone values obtained from ground-based and satellite measurements in the regions considered.