Bremen 2017 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 5: Postersession
UP 5.14: Poster
Dienstag, 14. März 2017, 16:40–18:10, GW2 B3010
20 years of tropical tropospheric ozone columns from nadir retrievals of GOME, SCIAMACHY and GOME-2 using the Convective Clouds Differential technique — •Elpida Leventidou1, Mark Weber1, Kai-Uwe Eichmann1, John P. Burrows1, and Andrea Pozzer2 — 1Inst. of Environmental Physics, University of Bremen, Bremen, Germany — 2Max-Planck-Institut for Chemistry , Mainz, Germany
Tropical tropospheric ozone columns can be retrieved with the Convective Cloud Differential (CCD) technique using retrieved total ozone columns and cloud parameters from space-borne observations. A CCD-IUP algorithm has been developed and applied to GOME, SCIAMACHY, and GOME-2 weighting function DOAS total ozone data. A 20 years record of monthly averaged tropical tropospheric ozone columns (20S - 20N) was created starting in 1996 and was extensively validated by comparisons with SHADOZ ozonesonde data. The comparison shows good agreement. Biases where found to be within 5 DU and the RMS errors less than 10 DU. The dataset has been harmonized into one consistent time series and was later used to determine tropical tropospheric ozone trends. The mean tropical tropospheric ozone trends range between +/-5 DU/Decade, with a mean value of 1.15 +/- 1.1 DU/Decade. The influence of 2015 el Niño event has been investigated in a case study using simulations from the ECHAM/Messy Atmospheric Chemisty model. Enhanced tropospheric ozone columns have been found over the Indonesian region (~ 8DU) and reduced over the eastern Pacific (~-10 DU).