WMO OSCAR | Details for Instrument ERM-1

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Instrument: ERM-1

Instrument details

Acronym	ERM-1
Full name	Earth Radiation Measurement - 1
Purpose	Earth radiation budget
Short description	Two channels. Two units, one scanning, one non-scanning [see detailed characteristics below]
Background	New development. Operations on FY-3A stopped in 2009. Operations on FY-3B stopped in 2011
Scanning Technique	Scanner: swath 2300 km; cross-track scanning,151 steps of 28 km s.s.p. every 4 s; non-scanning: 120 degrees viewing angle (2200 km), 8 samples every 4 s.
Resolution	Scanner: 28 km
Coverage / Cycle	Global coverage twice/day (total radiance) or once/day (short-wave)
Mass	37 kg	Power	40 W	Data Rate	2.6 kbps

Providing Agency	CMA
Instrument Maturity	Flown on operational programme
Utilization Period:	2008 to 2022
Last update:	2021-06-02

Detailed characteristics

Channel	Spectral interval	Noise Equivalent Radiance	Absolute accuracy	SNR
Short-wave (outgoing)	0.2 - 3.8 µm	0.4 W m^-2 sr^-1	1.5 W m^-2 sr^-1	900
Total radiance (outgoing)	0.2 - 50 µm	0.4 W m^-2 sr^-1	1.1 W m^-2 sr^-1	1250

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

Feng-Yun - 3 (CMA)
- FY-3A (see instrument status) May 2008 - Jan 2015
- FY-3B (see instrument status) Nov 2010 - Dec 2021
- FY-3C (see instrument status) Sep 2013 - 2022

Instrument classification

Earth observation instrument
Passive optical radiometer or spectrometer
Broadband Earth radiation radiometer

WIGOS Subcomponents

Subcomponent 1
Absolutely calibrated broadband radiometers, and TSI and SSI radiometers
Broadband radiometer (for ERB)

Mission objectives

Primary mission objectives

Upward long-wave irradiance at TOA
Upward short-wave irradiance at TOA

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
Upward short-wave irradiance at TOA*	2 - very high	Information on BRDF needed.	SW and Total (SW+LW) broadband channels
Upward long-wave irradiance at TOA*	2 - very high	No specific limitation.	LW radiance achieved by difference between Total and SW