WMO OSCAR | Details for Instrument GMI (GF-5)

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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

Gao Fen (CNSA)
- GF-5 (see instrument status) May 2018 - 2020
- GF-5-02 (see instrument status) Sep 2021 - 2028

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

Primary mission objectives

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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.