Journal Article

PreJuSER-7582

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Evaluation of CLaMS, KASIMA and ECHAM5/MESSy1 simulations in the lower stratosphere using observations of Odin/SMR and ILAS/ILAS-II

Khosrawi, F. ; Müller, R.FZJ* ; Proffitt, M. H. ; Ruhnke, R. ; Kirner, O. ; Jöckel, P. ; Grooß, J.-U. ; Urban, J. ; Murtagh, D. ; Nakajima, H.

2009
EGU Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/10070

Abstract: 1-year data sets of monthly averaged nitrous oxide (N2O) and ozone (O-3) derived from satellite measurements were used as a tool for the evaluation of atmospheric photochemical models. Two 1-year data sets, one solar occultation data set derived from the Improved Limb Atmospheric Spectrometer (ILAS and ILAS-II) and one limb sounding data set derived from the Odin Sub-Millimetre Radiometer (Odin/SMR) were employed. Here, these data sets are used for the evaluation of two Chemical Transport Models (CTMs), the Karlsruhe Simulation Model of the Middle Atmosphere (KASIMA) and the Chemical Lagrangian Model of the Stratosphere (CLaMS) as well as for one Chemistry-Climate Model (CCM), the atmospheric chemistry general circulation model ECHAM5/MESSy1 (E5M1) in the lower stratosphere with focus on the Northern Hemisphere. Since the Odin/SMR measurements cover the entire hemisphere, the evaluation is performed for the entire hemisphere as well as for the low latitudes, midlatitudes and high latitudes using the Odin/SMR 1-year data set as reference. To assess the impact of using different data sets for such an evaluation study we repeat the evaluation for the polar lower stratosphere using the ILAS/ILAS-II data set. Only small differences were found using ILAS/ILAS-II instead of Odin/SMR as a reference, thus, showing that the results are not influenced by the particular satellite data set used for the evaluation. The evaluation of CLaMS, KASIMA and E5M1 shows that all models are in agreement with Odin/SMR and ILAS/ILAS-II. Differences are generally in the range of +/- 20%. Larger differences (up to -40%) are found in all models at 500 +/- 25 K for N2O mixing ratios greater than 200 ppbv, thus in air masses of tropical character. Generally, the largest differences were found for the tropics and the lowest for the polar regions. However, an underestimation of polar winter ozone loss was found both in KASIMA and E5M1 both in the Northern and Southern Hemisphere.

Keyword(s): J

Note: We are grateful to the European Space Agency (ESA) for providing the Odin/SMR data. Odin is a Swedish led project funded jointly by Sweden (SNSB), Canada (CSA), Finland (TEKES), and France (CNES) and the European Space Agency (ESA). The Improved Limb Atmospheric Spectrometer (ILAS and ILAS-II) were were developed by the Japanese Ministry of Environment (MOE) and were operated by the Japan Aerospace Exploration Agency (JAXA). The ILAS/ILAS-II data was processed at the ILAS and ILAS-II Data Handling Facility, National Institute of Environmental Studies (NIES), Japan. We would like to thank the UK Met Office (UKMO) and European Center for Medium Range Weather Forecasts (ECMWF) for providing their meteorological analyses. We also would like to thank P. Achtert for helping with the graphic editing and the anonymous reviewers for helpful comments. We are also grateful to the Swedish Research Council for funding F. Khosrawi.

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Research Program(s):

1. Atmosphäre und Klima (P22)

Appears in the scientific report 2009

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