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| MIPAS | |
|---|---|
| Name | MIPAS |
| Mission type | Earth science |
| Operator | European Space Agency |
| Manufacturer | EADS Astrium |
| Launch date | 1 March 2002 |
| Launch vehicle | Rockot |
| Launch site | Plesetsk Cosmodrome |
| Orbit | Sun-synchronous |
| Instruments | Michelson interferometer for passive atmospheric sounding |
MIPAS is a spaceborne Michelson interferometer that measured atmospheric composition and temperature in the middle and upper troposphere, stratosphere, mesosphere, and lower thermosphere. The instrument delivered high-spectral-resolution limb-emission infrared spectra and produced global datasets used across atmospheric chemistry, climate, and pollution research. Operated on the Envisat satellite, the payload supported international projects, intercomparison campaigns, and operational services.
MIPAS provided vertical profiles of trace gases, temperature, and pressure, sampling the limb emission in the mid- to far-infrared to retrieve species such as ozone, water vapor, methane, nitric acid, and chlorine compounds. The sensor complemented instruments on ERS-2, Aqua, Aura, and SCISAT by offering unique spectral ranges and vertical resolution. Data from MIPAS were essential for studies connected with the Montreal Protocol, the Kyoto Protocol, and assessments by the Intergovernmental Panel on Climate Change.
MIPAS used a cryogenically cooled Michelson interferometer coupled to a limb-viewing telescope, employing a high-resolution scanning mechanism and a focal plane array optimized for the 4.15–14.6 μm region. The design incorporated contributions from aerospace contractors including Thales Alenia Space, EADS Astrium, and research groups at Max Planck Institute for Chemistry, Institut Pierre-Simon Laplace, and Imperial College London. Operational modes included full spectral resolution and reduced-resolution nominal modes to balance signal-to-noise and telemetry constraints, coordinated with orbit control of Envisat and timing references from onboard atomic clocks and attitude sensors similar to those used on ERS-1 and ERS-2.
MIPAS was launched aboard Envisat on 1 March 2002 from Plesetsk Cosmodrome using a Rockot vehicle, entering a sun-synchronous polar orbit to provide near-global coverage. Key mission milestones involved calibration campaigns at Kiruna and validation campaigns over Ny-Ålesund and Mauna Loa Observatory, and response actions after anomalies in Envisat telemetry during 2007–2009. The instrument participated in coordinated measurement campaigns with ACE-FTS, GOMOS, SCIAMACHY, and ground networks such as NDACC and AERONET until contact loss with Envisat in 2012, followed by archival stewardship by ESA and data distribution via scientific data centers.
Level 0 radiance spectra, Level 1 calibrated spectra, and Level 2 geophysical profiles (temperature and concentrations) were produced using inversion algorithms developed by teams at University of Oxford, Karlsruhe Institute of Technology, and University of Bremen. Processing chains integrated line-by-line radiative transfer models such as those from HITRAN datasets and used spectroscopic parameters validated by JETPROP and laboratory groups at National Institute of Standards and Technology and NASA Ames Research Center. Data formats followed community standards compatible with archives at ESA Earth Online, EUMETSAT, and KNMI and were used in assimilation systems at ECMWF and Met Office.
MIPAS enabled advances in understanding polar ozone depletion, global ozone recovery signals linked to the Montreal Protocol, the stratospheric budget of nitrogen oxides and chlorine species, and stratosphere–troposphere exchange processes relevant to El Niño–Southern Oscillation teleconnections. Studies using MIPAS data quantified trends in greenhouse gases like methane and nitrous oxide, supported attribution work relating to IPCC forcing estimates, and characterized gravity wave-driven transport examined alongside GOCE and GRACE gravity measurements. MIPAS observations aided research on volcanic plumes from eruptions such as Eyjafjallajökull and Mount Pinatubo, and informed assessments of polar spring chemical cycles carried out by groups at Scripps Institution of Oceanography, NOAA, and LMD (Laboratoire de Météorologie Dynamique).
Calibration strategies included periodic internal blackbody checks, vignetting assessments, and intercomparisons with reference instruments from NOAA, JPL, and DLR (German Aerospace Center). Validation used balloon-borne cryogenic frost-point hygrometers, ozonesondes from WOUDC stations, and correlative satellite data from MLS (Microwave Limb Sounder) and OMI. Error budgets accounted for radiometric uncertainty, spectroscopic parameter errors from HITRAN, forward model approximations, and retrieval regularization; these were quantified in instrument characterization studies led by teams at University of Leeds, ETH Zurich, and CNRS.
The MIPAS program engaged a broad network of partners including ESA, national space agencies such as DLR and CNES, academic institutions like University of Cambridge and ETH Zurich, and operational centers including EUMETSAT and ECMWF. Ground support and validation campaigns coordinated through observatories at Kiruna Observatory, Ny-Ålesund Research Station, and Izaña Atmospheric Research Center involved collaborations with WMO networks and contributed to intercomparison efforts with instruments on GOMOS, SCIAMACHY, ACE-FTS, and participating airborne platforms managed by DLR and NASA.
Category:Earth observation instruments Category:Atmospheric sounding satellites