WMO OSCAR | Details for Instrument EMI-2

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Instrument: EMI-2

Instrument details

Acronym	EMI-2
Full name	Environment Monitoring Instrument-2
Purpose	Ozone profile and total-column or gross profile of other species. Tracked species: BrO, ClO H2O, HCHO, NO, NO2, O3, SO2 and aerosol
Short description	Updated version of EMI a UV/VIS grating imaging spectrometer, four bands, 1536 channels total [see detailed characteristics below]. Differences of EMI-2 from EMI will be added when available.
Background	Heritage of the Ozone Monitoring Instrument (OMI) flown on Aura
Scanning Technique	Pushbroom, cross-track swath 2500 km
Resolution	13 km along-track x 48 km cross-track
Coverage / Cycle	Global coverage every day, in daylight
Mass		Power	Data Rate

Providing Agency	CNSA
Instrument Maturity	Flown on an R&D satellite
Utilization Period:	2022 to 2033
Last update:	2022-07-18

Detailed characteristics

Spectral range	No. of channels	Spectral resolution	SNR @ specified input spectral radiance
240-315 nm	256	0.3 nm	200 @ 1.27 mW cm^-2 sr^-1 nm^-1
311-403 nm	256	0.3 nm	200 @ 1.27 mW cm^-2 sr^-1 nm^-1
401-600 nm	512	0.5 nm	2000 @ 10.89 mW cm^-2 sr^-1 nm^-1
590-790 nm	512	0.5 nm	2000 @ 10.89 mW cm^-2 sr^-1 nm^-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

Gao Fen (CNSA)
- DQ-1 (see instrument status) Jul 2022 - 2030
- DQ-2 (see instrument status) 2025 - 2033

Instrument classification

Earth observation instrument
Passive optical radiometer or spectrometer
Cross-nadir shortwave (UV/VIS) sounder

WIGOS Subcomponents

Subcomponent 1
UV/VIS/NIR sounders, nadir and limb
UV/VIS/NIR nadir sounder

Mission objectives

Primary mission objectives

BrO
CH3Br
ClO
H2O
HCHO
HCHO Total Column
NO
NO2
NO2 Total Column
O3
O3 Total Column
SO2
SO2 Total Column

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.

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Aerosol column burden	2 - very high	Cloud sensitive.. Daylight only.	UV (for absorbing aerosol) and VIS spectrometry
Aerosol effective radius	2 - very high	Cloud sensitive.. Daylight only.	UV (for absorbing aerosol) and VIS spectrometry
Aerosol mass mixing ratio	2 - very high	Cloud sensitive.. Daylight only.	UV (for absorbing aerosol) and VIS spectrometry
Aerosol Optical Depth	2 - very high	Cloud sensitive.. Daylight only.	UV (for absorbing aerosol) and VIS spectrometry
Aerosol type	2 - very high	Cloud sensitive.. Daylight only.	UV (for absorbing aerosol) and VIS spectrometry
BrO*	1 - primary	Cloud sensitive.. Daylight only.	UV spectrometry. BrO lines around 300 nm
HCHO*	1 - primary	Cloud sensitive.. Daylight only.	UV spectrometry. HCHO lines around 350 nm
HCHO Total Column*	1 - primary	Cloud sensitive.. Daylight only.	UV spectrometry. HCHO lines around 350 nm
CH3Br*	3 - high	Cloud sensitive.. Daylight only.	Spectrometry in the HC3Br band from 200 to 250 nm
ClO*	1 - primary	Cloud sensitive.. Daylight only.	UV Spectrometry. ClO lines around 300 nm
Cloud cover	5 - marginal	Daylight only.	VIS spectroscopy
Cloud optical depth	5 - marginal	Low-density cloud only.. Daylight only.	VIS spectrometry
Earth surface albedo	4 - fair	Cloud sensitive.	VIS spectrometry, range fully covered
Fraction of Absorbed PAR (FAPAR)	2 - very high	Cloud sensitive.	VIS spectrometry including Red at 700 nm
H2O*	3 - high	Cloud sensitive.. Daylight only.	UV and VIS spectrometry. Several weak bands
NO*	1 - primary	Cloud sensitive.. Daylight only.	UV spectrometry. NO lines around 250 nm
NO2*	1 - primary	Cloud sensitive.. Daylight only.	UV and VIS spectrometry. Several lines in the ranges around 220 nm and 400 nm
NO2 Total Column*	1 - primary	Cloud sensitive.. Daylight only.	UV and VIS spectrometry. Several NO2 lines
O3*	2 - very high	Cloud sensitive.. Daylight only.	UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis)
O3 Total Column*	2 - very high	Cloud sensitive.. Daylight only.	UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis)
Photosynthetically Active Radiation (PAR)	2 - very high	Cloud sensitive.	VIS spectrometry, range fully covered
PSC occurrence	2 - very high	Coarse vertical resolution.. Daylight only.	UV and VIS spectrometry
SO2*	1 - primary	Cloud sensitive.. Daylight only.	UV spectrometry. SO2 lines around 350 nm
SO2 Total Column*	1 - primary	Cloud sensitive.. Daylight only.	UV spectrometry. SO2 lines around 350 nm
Upward short-wave irradiance at TOA	3 - high	Spectral interpolation needed.. Information on BRDF needed.	UV and VIS spectrometry
Upward spectral radiance at TOA	5 - marginal	Missing NIR, SWIR and all Long-waves.	UV and VIS spectrometry
Aerosol volcanic ash	2 - very high	Cloud sensitive.. Daylight only.	UV (specifically sensitive to ash) and VIS spectrometry
Aerosol volcanic ash Total Column	2 - very high	Cloud sensitive.. Daylight only.	UV (specifically sensitive to ash) and VIS spectrometry