1.1.6 Summary of applications and products
The Michelson Interferometer for
Passive Atmospheric Sounding (MIPAS) is a
Fourier transform spectrometer that is part of
the suite of instruments onboard ENVISAT. This instrument
measures the infrared radiation emitted by
the atmosphere as a function of the wavelength.
It measures this radiation in the spectral range
between 685 - 2410 cm-1 (14.6 -
4.15 µm) with a spectral interval of
up to 0.025 cm-1.
At the highest spectral resolution, it takes
about 4.45 s to acquire a single spectrum. An elevation
scanning mirror allows the instrument to measure
at 16 different altitudes. In the course of a
single orbit, MIPAS will typically acquire 75
scans made of spectra acquired at the 16
different elevations. Between measurements, the
instrument also acquires calibration data used
to perform the radiometric calibration.
The calibrated radiance spectra obtained with
MIPAS are then feed to inversion models.
These atmospheric models transform the spectra
in vertical profiles of pressure, temperature
and concentration of the following gases:
O3, H2O, CH4,
N2O, HNO3 and
NO2. This information is valuable
to monitor some of the gases that contribute to
the greenhouse effect and to monitor the
chemistry processes linked to the generation
and destruction of ozone in the atmosphere.
The main data product obtained with MIPAS includes:
- Radiometrically calibrated, spectrally
corrected and geo-located spectra of radiance.
- Vertical profiles of pressure
- Vertical profiles of temperature
- Vertical profiles of volume mixing ratio
of O3, H2O,
HNO3 and NO2
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,