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Instrument details
Acronym
GAS
Full name
Greenhouse-gases Absorption Spectrometer
Purpose
Atmospheric chemistry - Measurement of CO2, CH4, CO, N2O
Short description
Fourier transform spectrometer operating in four NIR/SWIR bands [see detailed characteristics below]
Background
New development
Scanning Technique
Two views, nadir or pointing to sunglint
Resolution
10 km s.s.p.
Coverage / Cycle
Global coverage in one month for cells of 100 km side, in daylight
Mass
Power
Data Rate
Providing Agency
CMA
Instrument Maturity
Backed by strong heritage
Utilization Period:
2018-02-10 to 2021
Last update:
2021-12-13
Detailed characteristics
Spectral range (μm ) Spectral range (cm-1 ) Spectral resolution SNR @ expected input radiance 0.75-0.77 μm
13000-13300 cm-1
0.60 cm-1
> 300
1.56-1.72 μm
5800-6400 cm-1
0.27 cm-1
> 300
1.92-2.08 μm
4800-5200 cm-1
0.27 cm-1
> 300
2.20-2.38 μm
4200-4550 cm-1
0.27 cm-1
> 300
Satellites this instrument is flying on
Note: a red tag indicates satellites no longer operational, a
green tag indicates operational satellites, a blue tag indicates
future satellites
Instrument classification
Earth observation instrument Passive optical radiometer or spectrometer Cross-nadir shortwave (UV/VIS) sounder
WIGOS Subcomponents
Subcomponent 1 UV/VIS/NIR nadir sounder Subcomponent 2 NIR/SWIR imaging spectrometer Subcomponent 3 NIR spectrometer
Mission objectives
Tentative Evaluation of Measurements
The following list indicates which measurements can typically be
retrieved from this category of instrument. To see a full Gap Analysis by Variable,
click on the respective variable.
Note: table can be sorted by clicking on the column headers
Variable Relevance for measuring this variable Operational limitations Explanation
CH4 3 - high Cloud sensitive.. Daylight only.. Along-track only. SWIR spectrometry. CH4 lines around 2.3 micrometers
Cloud top height 4 - fair Daylight only.. Along-track only. NIR spectrometry to estimate the total-column O2 above the cloud top as measured around 760 nm
CO 3 - high Cloud sensitive.. Daylight only.. Along-track only. SWIR spectrometry. CO lines around 2.3 micrometers
CO2 3 - high Cloud sensitive.. Daylight only.. Along-track only. SWIR spectroscopy. CO2 lines around 1.6 and 2.1 micrometers
N2O 3 - high Along-track only.. Cloud sensitive.. Daylight only. SWIR spectrometry. N2O lines around 2.3 micrometers
Instrument: GAS