WMO OSCAR | Details for Instrument GOMOS

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Instrument: GOMOS

Instrument details

Acronym	GOMOS
Full name	Global Ozone Monitoring by Occultation of Stars
Purpose	Profiles of ozone and other species. Tracked species: BrO, ClO, H2O, NO2, NO3, O3, OClO and aerosol [see detailed characteristics below]
Short description	UV/VIS/NIR grating spectrometer, three bands, ~ 1000 channels, two broadband channels for scintillations
Background	New development
Scanning Technique	Limb sounding during occultation of 25-40 stars/orbit, i.e. average 500 occultations/day
Resolution	Vertical: 1.7 km, in the altitude range 20-100 km. Horizontal effective resolution: ~ 300 km (limb geometry)
Coverage / Cycle	One global coverage/day with one measurement every 1000 x 1000 km2 cell in average
Mass	163 kg	Power	146 W	Data Rate	222 kbps

Providing Agency	ESA
Instrument Maturity	Flown on an R&D satellite
Utilization Period:	2002 to 2011
Last update:	2022-07-26

Detailed characteristics

Spectral range	No. of channels	Spectral resolution	SNR @ specified input spectral radiance
248-693 nm	~ 500	0.89 nm	................. @ ......... W m^-2 sr^-1 μm^-1
750-776 nm	~ 200	0.12 nm	................. @ ......... W m^-2 sr^-1 μm^-1
915-956 nm	~ 300	0.12 nm	................. @ ......... W m^-2 sr^-1 μm^-1
466-582 nm	1	116 nm	................. @ ......... W m^-2 sr^-1 μm^-1
644-705 nm	1	61 nm	................. @ ......... W m^-2 sr^-1 μm^-1

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

Environmental Satellite (ESA)
- Envisat (see instrument status) Jun 2002 - Aug 2011

Instrument classification

Earth observation instrument
Limb sounders
Limb sounder

WIGOS Subcomponents

Subcomponent 2
UV/VIS/NIR/IR/MW limb sounders
UV/VIS/NIR/IR occultation limb sounder

Mission objectives

Primary mission objectives

BrO
ClO
H2O
HCHO
NO
NO2
O3
SO2

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
Note: * Primary mission objective.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
BrO*	4 - fair	Limited to high atmosphere.	UV spectrometry. BrO lines around 300 nm. Limb sounding by star occultation. Self-calibrating
HCHO*	4 - fair	Limited to high atmosphere.	UV spectrometry. HCHO lines around 350 nm Limb sounding by star occultation. Self-calibrating
ClO*	4 - fair	Limited to high atmosphere.	UV spectrometry. ClO lines around 300 nm. Limb sounding by star occultation. Self-calibrating
Aerosol mass mixing ratio	5 - marginal	Limited to high atmosphere.	UV, VIS, NIR Limb sounding by star occultation: Self-calibrating
Atmospheric temperature	5 - marginal	Limited to high atmosphere.	UV, VIS, NIR limb sounding by star occultation: Self-calibrating
H2O*	5 - marginal	Limited to high atmosphere.	Spectrometry in UV and VIS (several weak bands) and NIR (strong band around 940 nm). Limb sounding by star occultation. Self-calibrating
NO*	5 - marginal	Limited to high atmosphere.	UV spectrometry. NO lines around 250 nm. Limb sounding by star occultation. Self-calibrating
NO2*	5 - marginal	Limited to high atmosphere.	UV and VIS spectrometry. Several lines in the ranges around 220 nm and 400 nm. Limb sounding by star occultation. Self-calibrating
O3*	5 - marginal	Limited to high atmosphere.	UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis). Limb sounding by star occultation. Self-calibrating
PSC occurrence	5 - marginal	Limited to high atmosphere.	UV and VIS spectrometry. Limb sounding by star occultations. Self-calibrating
SO2*	5 - marginal	Limited to high atmosphere.	UV spectrometry. SO2 lines around 350 nm. Limb sounding by star occultation. Self-calibrating
Specific humidity	5 - marginal	Limited to high atmosphere.	UV, VIS and NIR spectrometry with several water vapour bands (main: around 940 nm). Limb sounding by star occultation, Self-calibrating
Aerosol volcanic ash	5 - marginal	Limited to high atmosphere.	UV, VIS and NIR spectrometry; limb sounding by star occultation. Self-calibrating

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