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Tomographic Analysis of the Stratosphere and Upper Troposphere from 2002 to 2008 Using MIPAS2D

Enzo Papandrea(1) and Enrico Arnone(1)

(1) University of Bologna, Via Risorgimento 4, 40136, Italy


Over the last decades, the injection into the atmosphere of gases of anthropogenic origin, such as greenhouse gases and Ozone-Depleting Substances (ODSs), caused substantial changes of the chemical composition of the stratosphere. As a result, the stratosphere appears to have cooled mainly as a consequence of ozone depletion in its lower part and of increased CO2 in its upper part. However, the complexity and high natural variability of the dynamically controlled upper troposphere-lower stratosphere region severely affects our ability of discerning the various components of these changes and correctly predict future trends. Satellite missions, with their global and multi-year coverage, give the possibility to study the physical and chemical quantities of the atmosphere in their distribution, variability and long term trends. Among these missions, the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), onboard ENVISAT limb sounds the upper troposphere and stratosphere since March 2002. Measurements from MIPAS, both in its original configuration (July 2002-March 2004) and in its new configuration (since January 2005) have been analyzed with the 2-D tomographic Geo-fit Multi-Target Retrieval (GMTR) system. The tomographic approach is needed in order to resolve the horizontal inhomogeneity of the atmosphere and aid in correctly interpreting the observed variability and change. The retrieved fields of pressure, temperature and Volume Mixing Ratio (VMR) of key atmospheric gases H2O, O3, HNO3, CH4, N2O and NO2, and additional minor species (CFC-11, CFC-12, N2O5, COF2, ClONO2), were stored in the MIPAS2D database. In this paper, we present for the first time the tomographic view of six years of MIPAS2D data and use them to study tropospheric and stratospheric variability and long term trends of atmospheric species related to ozone chemistry.