WMO OSCAR | Details for Instrument SAGE-II

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Instrument: SAGE-II

Instrument details

Acronym	SAGE-II
Full name	Stratospheric Aerosol and Gas Experiment - II
Purpose	Observation of stratospheric H2O, NO2, O3 and aerosol
Short description	UV/VIS/NIR grating spectrometer with 7 sub-bands in the spectral range 0.385-1.020 µm. Spectral resolution from 1 to 2 nm
Background	Follow-on of SAGE-1 flown in 1979-1981 on AEM-2 (Application Explorer - 2)
Scanning Technique	Sun occultation
Resolution	300 km (horizontal), 1-2 km (vertical)
Coverage / Cycle	N/A (few tens of events/day limited to latitudes ~ 57°)
Mass	29.5 kg	Power	18 W	Data Rate	6.3 kbps

Providing Agency	NASA
Instrument Maturity	Flown on an R&D satellite
Utilization Period:	1985 to 2005
Last update:	2017-01-17

Detailed characteristics

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

Earth Radiation Budget Satellite (NASA)
- ERBS (see instrument status) Jan 1985 - Oct 2005

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
Aerosol mass mixing ratio	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.. Daylight only.	UV, VIS, NIR limb sounding by solar occultation. Self-calibrating
H2O*	5 - marginal	Daylight only.. Limited to high atmosphere.. Limited to high latitudes.	Spectrometry in UV and VIS (several weak bands) and NIR (strong band around 940 nm). Limb sounding by solar occultation. Self-calibrating
Specific humidity	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.. Daylight only.	UV, VIS and NIR spectrometry with several water vapour bands (main: around 940 nm). Limb sounding by solar occultation, Self-calibrating
Aerosol volcanic ash	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.. Daylight only.	UV, VIS and NIR spectrometry; limb sounding by solar occultation. Self-calibrating
BrO*	5 - marginal	Limited to high atmosphere.. Daylight only.	UV spectrometry. BrO lines around 300 nm. Limb sounding by solar occultation.. Self-calibrating
HCHO*	5 - marginal	Limited to high atmosphere.. Daylight only.	UV spectrometry. HCHO lines around 350 nm Limb sounding by solar occultation. Self-calibrating
ClO*	5 - marginal	Limited to high atmosphere.. Daylight only.	UV spectrometry. ClO lines around 300 nm. Limb sounding by solar occultation. Self-calibrating
NO*	5 - marginal	Limited to high atmosphere.. Daylight only.	UV spectrometry. NO lines around 250 nm. Limb sounding by solar occultation. Self-calibrating
NO2*	5 - marginal	Limited to high atmosphere.. Daylight only.	UV and VIS spectrometry. Several lines in the ranges around 220 nm and 400 nm. Limb sounding by solar occultation. Self-calibrating
O3*	5 - marginal	Limited to high atmosphere.. Daylight only.	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 solar occultation. Self-calibrating
PSC occurrence	5 - marginal	Limited to high atmosphere.. Daylight only.	UV and VIS spectrometry. Limb sounding by solar occultation. Self-calibrating
SO2*	5 - marginal	Limited to high atmosphere.. Daylight only.	UV spectrometry. SO2 lines around 350 nm. Limb sounding by solar occultation. Self-calibrating
Atmospheric temperature	5 - marginal	Limited to high atmosphere.. Daylight only.	VIS spectroscopy at lower resolution 10 nm

Showing 1 to 13 of 13 entries