Comparison of total ozone from the satellite instruments GOME and TOMS with measurements from the Dobson network 1996–2000

Abstract

Abstract. Over the last 3 decades, satellite data have been used to monitor long-term global changes in stratospheric ozone. The TOMS series (1978-present) and GOME (1995-present) are two very important instruments in this context. In this paper, TOMS total ozone and three approaches to derive total ozone from GOME measurements are validated with ground-based Dobson network data. Beyond the operational products of both instruments, e.g. TOMS version 7 and GOME Data Processor version 2.7, total ozone is calculated by integrating FURM ozone profiles and by applying the TOMS algorithm to the GOME spectra. All algorithms show in general good agreement with ground-based measurements. The operational GOME total ozone shows seasonal variations, most likely introduced by difficulties in the derivation of airmass factors, which convert measured slant columns into vertical columns. The TOMS algorithm estimates on average 2% higher total ozone in the southern hemisphere than in the northern for both instruments as compared to the ground-based data, indicating that the source of the observed hemispheric differences is in the TOMS algorithm. Both instruments show aging effects in 2000, leading to enhanced variability in the ozone column differences with respect to Dobson data. In addition, the integrated GOME ozone profiles and the TOMS algorithm applied to GOME data show larger mean deviations in 2000.

Ozone climatology and its variability from ground based and satellite observations over Irene, South Africa (25.5º S; 28.1º E) – Part 2: Total column ozone variations

“…This data set also showed the highest values for all seasons. TOMS values for all seasons are consistent with the findings of Bramstedt et al (2003). High ozone measurements from the TOMS satellite can also be due to the years of overpass (1978 to 1993) when atmospheric ozone concentrations were relatively high (Bojkov and Fioletov, 1995).…”

Metrology of ground-based satellite validation: co-location mismatch and smoothing issues of total ozone comparisons

“…Lambert et al, 1999Lambert et al, , 2000Bramstedt et al, 2003;Balis et al, 2007a, b;McPeters et al, 2008;Koukouli et al, 2012Koukouli et al, , 2015. An "inverse" quality assessment, i.e.…”

“…Ridolfi et al, 2007;Lambert et al, 2012;Ignaccolo et al, 2015) and for ozone profiles (Sparling et al, 2006;Cortesi et al, 2007), they remain to be quantified for total ozone column (TOC) comparisons. This is the objective of the current paper.…”

Construction of merged satellite total O<sub>3</sub> and NO<sub>2</sub> time series in the tropics for trend studies and evaluation by comparison to NDACC SAOZ measurements

“…The estimated accuracy is about 3 to 5 %. Since 2000, EP-TOMS experienced instrumental problems introducing a 3 % bias in total ozone (Bramstedt et al, 2003). For the version 8, an empirical correction was applied by NASA to overcome this bias (McPeters et al, 2007).…”