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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 ≥2022
Last update:
2021-11-26
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
Mission objectives
Primary mission objectives CH4 mole fraction CO mole fraction CO2 mole fraction N2O mole fraction Opportunity objectives Show all Show fewer
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 mole fraction 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 mole fraction 3 - high Cloud sensitive.. Daylight only.. Along-track only. SWIR spectrometry. CO lines around 2.3 micrometers
CO2 mole fraction 3 - high Cloud sensitive.. Daylight only.. Along-track only. SWIR spectroscopy. CO2 lines around 1.6 and 2.1 micrometers
N2O mole fraction 3 - high Along-track only.. Cloud sensitive.. Daylight only. SWIR spectrometry. N2O lines around 2.3 micrometers
Instrument: GAS