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Chapter 1
MIPAS Products User Guide
1.1 How to Choose MIPAS Data?
1.1.1 Geophysical measurements
MIPAS will be one of the
atmospheric sensors on board
ESA's polar orbiting
ENVISAT to be launched towards the
end of 2001. Operating in the
mid-infrared (685 - 2410
cm-1, or 14.6 - 4.15
μm) it will provide a number of
geophysical parameters relevant for the
study of atmospheric chemistry, climatology
and tropospheric/stratospheric exchange
processes. During nominal in-orbit
operation MIPAS will routinely sense
the atmospheric limb emission while the
instrument's line-of-sight (LOS) is
periodically varied in discrete
steps, within a tangent height range of
about 8 km to 68 km. For each height step a
single interferometer stroke
('sweep') is performed
whilst interferograms are recorded in the five
spectral bands, A: 685 - 970
cm-1, AB: 1020 - 1170
cm-1, B: 1215 - 1500 cm-1,
C: 1570 - 1750 cm-1, D:
1820 - 2410 cm-1.
With a sweep measurement time of 4.45 s (high
resolution, max. path difference =
20 cm), 16 tangent heights per scan
and an orbit period of 100.6 minutes,
typically 75 complete elevation
scans will be acquired during each orbit.
Scene measurements are interleaved by
periodic radiometric offset
('deep space') measurements, in
intervals of about 300 s. In addition,
radiometric gain measurements,
comprising sequences of blackbody target and
deep space (D.S.) measurements, will be
performed at approximately one week
intervals.
The concept of
the ENVISAT Payload Data Segment, PDS, foresees
the routine generation and
dissemination of calibrated,
geolocated limb spectra (Level 1B products)
and of so-called Level 2 data
products. The latter covers vertical
profiles of atmospheric pressure (p),
temperature (T) as well as
volume-mixing-ratio (VMR) profiles of the
primary target species,
O3, H2O,
CH4, N2O,
HNO3 and NO2.
The table below provides a summary of MIPAS
data products as well as auxiliary input data
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Table 1.1 MIPAS Products Overview
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Level 1B component
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Product ID
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Description
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Size
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| MIP_NL__0P |
MIPAS raw (source
packet) data,
time ordered.
Header and general
quality information. |
310 MBytes/ orbit |
| MIP_NL__1P |
Included Data Sets:
Calibrated limb radiance
data in the five
MIPAS spectral bands:
A:
685-970 cm-1. AB:
1020-1,170
cm-1. B: 1215-
1500
cm-1. C:
1570-1750
cm-1. D:
1820-2410 cm-1
Annotation data:
Geolocation data, product
quality
information, processing
parameters, noise
assessment data, offset
calibration data.
|
320 MBytes/ orbit |
| MIP_xx1__AX |
Auxiliary products:
*
Calibration data (gain, offset
validation, LOS,
ILS)
* others
(e.g.,
characterisation data).
* orbit
state vector/attitude data. |
variable size |
|
Level 2 component
|
| MIP_NL__2P |
Vertical profiles of pressure,
temperature,
volume mixing ratio of O3, H2O,
CH4, N2O, NO2
and HNO3.
Annotation data:
Geolocation data, product
quality information,
residual spectra, fitted
continuum data,
processing parameters, others |
8.5 MBytes/ orbit |
| MIP_NLE_2P |
Included Data Sets:
Vertical profiles of pressure,
temperature,
concentration of O3 and
H2O.
Annotation data:
Geolocation
data, product quality
information, processing
parameters, others. |
8.5 MBytes/ orbit |
| MIP_xx2__AX |
Auxiliary products
*
Pre-tabulated cross-section,
microwindows data,
atmospheric profiles, pointing
information,
processing parameters
* ECMWF:
Meteorology forecast data |
variable size |
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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,
atmospheric chemistry
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EO Data Access
