MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) is a space-borne high-resolution limb emission Fourier transform infrared spectrometer, designed for measurement of atmospheric constituents. It will be part of the core payload of the Envisat Satellite of the European Space Agency (ESA). Launch is scheduled for July 2001. MIPAS will be able to measure a manifold of atmospheric trace constituents of major importance to ozone chemistry, atmospheric composition monitoring, and global change at global coverage, independently of sunlight, i.e. also during night or polar winter. Species to be measured by MIPAS are the nitrogen family (N2O, HNO3, NO, NO2, ClONO2, N2O5 and others), chlorine reservoirs (ClONO2, HOCl), chlorine source species (CFC-11, CFC-12, CFC-22, CCl4; possibly also CFC-113, HCFC-123, HCFC-141b, and HCFC-142b), chlorine radicals (ClO), dynamic tracers (H2O, N2O, CH4, CF4, SF6) and many more, e.g., CO, OCS, NH3, HCN, C2H2, or C2H6. Since ESA's operational data products will, due to restrictions by near real time processing, include only vertical profiles of five key species (O3, H2O, HNO3, N2O, CH4) and pressure and temperature, extension of this list of species to be analysed is of major scientific value. The major objective of this proposal is to fill this gap in the list of data products, while ensuring quality and comparability of data products provided by different scientific groups.

The second major goal is to gain confidence in the strategies and involved computer codes and to give proof to the international scientific community of the reliability and appropriateness of the approaches as well as the quality of data products. This includes:

The improved understanding of radiative transfer modelling and retrieval approaches will be shared with the scientific community by publication of the results in reports and tentatively in easily accessible scientific journals. New spectroscopic data and vibrational temperature data will be forwarded to interested and qualified users on request. Characterization and validation of data products will be extensively reported and made public for the scientific community by appropriate media to be agreed by the consortium. Candidate media are, among others, printed reports and internet web pages.