MIPAS microwindows
European Space Agency, (Special Publication) ESA SP (2005) 1323-1330
Abstract:
Spectrally resolving infrared instruments such as the Michelson Interferometer for Passive Atmospheric Sounding generate measurements at a far greater rate than can be accurately modelled within a retrieval. For limb-viewing instruments the usual approach is to select microwindows: subsets of the spectrum of a few cm-1 width which maximise the information on the target species while minimising the contributions from potential error sources such as emissions from other molecules. Here, the algorithm used to select microwindows for ESA's Level 2 processing of MIPAS data is outlined, together with some examples of its application.Ozone isotopes retrievals
European Space Agency, (Special Publication) ESA SP (2005) 193-198
Abstract:
The isotopic ratios of stratospheric ozone can be used as valuable tracers for many processes in the atmosphere. Here we compare stratospheric enrichments of heavy ozone obtained from two limb sounders: MIPAS (Michelson Interferometer for Passive Atmospheric Sounding), on board Envisat, SMR (Sub-Millimetre Radiometer), on board the Odin satellite.Progress in the retrieval of sulphur species from MIPAS
European Space Agency, (Special Publication) ESA SP (2005) 1065-1072
Abstract:
Operationally only pressure, temperature and six significant trace gases are retrieved by ESA from MIPAS data. However, information on many other species is also present in the spectra. We apply a variety of techniques and our own retrieval model to retrieve the concentration of three other species: SO 2,OCS and SF6. Sulphur Dioxide (SO2) is an acidic gas with both natural and anthropogenic sources that is rapidly converted to sulphuric acid and hence sulphate aerosols in the atmosphere. Carbonyl Sulphide (OCS) is produced naturally at the ocean surface and by biomass burning and, through stratospheric oxidation, it is thought to be the main contributor to non-volcanic stratospheric sulphate aerosols. Sulphur Hexafluoride (SF 6) is almost entirely anthropogenic in its origins and shows steady year-on-year increases making it useful for age of air and tracer studies. We anticipate the good global coverage and continuity of data will make MIPAS useful for the determination of changes and trends in the quantity and distribution of these species both natural and anthropogenic. In this paper we summarise the current progress that has been made in the retrieval of these important sulphur-containing species. We show some preliminary zonal mean fields and briefly outline the methods applied.Water vapour isotope measurements: Comparisons between results from MIPAS and the Odin Sub-Millimetre Radiometer
European Space Agency, (Special Publication) ESA SP (2005) 1135-1140
Abstract:
The isotopic composition of stratospheric water vapour depends on the sources of water vapour and the temperature and precipitation history of the stratospheric air. Isotopic measurements therefore have potential to aid invesigation of dehydration in the polar vortex, of stratospheric/tropospheric exchange, of upward transport in the tropics and of subsidence at polar latitudes. Here we compare measurements of H216O, HDO and H218O from two satellite limb-sounding instruments: the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), an infra-red limb sounder on Envisat, and the Sub-Millimetre Radiometer (SMR), a microwave limb sounder on board the Odin satellite.Retrieval of Hydrogen Peroxide (H2O2) Profiles using ENVISAT-MIPAS
Geophysical Research Letters 32 (2005) L14809 4 pages