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Instrument: GMI (GF-5)
Instrument details
Acronym
GMI (GF-5)
Full name
Greenhouse-gases Monitoring Instrument
Purpose
CO2 and CH4 profiles
Short description
4-band NIR/SWIR grating spectrometer [see detailed characteristics below]
Background
Heritage of the Orbiting Carbon Observatory (OCO), flown on OCO-2
Scanning Technique
Mechanical cross-track scanning. Five cross-track samples at about 150 km distance, along-track sampling at about 130 km distance. Swath about 800 km
Resolution
10.3 km at the s.s.p.
Coverage / Cycle
Global in 5 days, in daylight
Mass
109 kg
Power
120 W
Data Rate
30 Mbps
Providing Agency
CNSA
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
2018 to 2020
Last update:
2021-06-16
Detailed characteristics
Species
Central wavelength
Spectral range
Spectral resolution
SNR @ 30 % albedo
O2
765 nm
759-769 nm
0.027 nm
300
CO2
1575 nm
1568-1583 nm
0.067 nm
300
CH4
1650 nm
1642-1658 nm
0.067 nm
250
CO2
2050 nm
2043-2058 nm
0.113 nm
250
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
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 1 - primary Cloud sensitive.. Daylight only. Very-high resolution SWIR spectrometry. CH4 lines around 1.65 micrometers. Specifically designed for CH4.
CO2 1 - primary Cloud sensitive.. Daylight only. Very-high resolution SWIR spectrometry CO2 lines around 1.6 and 2.1 micrometers. Specifically designed for CO2.