BackForwardInstrument:  MWI (MetOp-SG) 

Instrument details
Acronym MWI (MetOp-SG)
Full name Micro-Wave Imager
Purpose Multi-purpose imagery focusing on precipitation, with temperature/humidity sounding channels
Short description 18 frequencies, 26 channels [see detailed characteristics below]
Background New development
Scanning Technique Conical: 53.1° zenit angle, swath 1700 km, 40 scans/min = 10 km/scan
Resolution Changing with frequency, consistent with an antenna diameter of 75 cm
Coverage / Cycle Global coverage once/day
Mass 220 kg Power 250 W Data Rate 160 kbps

 

Providing Agency ESA
Instrument Maturity Backed by strong heritage
Utilization Period: ≥2023 to ≥2044
Last update: 2019-11-14
Detailed characteristics

No.

Central frequency (GHz)

Bandwidth (MHz)

Polarisations

NEΔT

IFOV

1

18.7

200

V, H

0.8 K

50 km

2

23.8

400

V, H

0.7 K

50 km

3

31.4

200/10001

V, H

0.9 K

30 km

4

50.3

400

V, H

1.1 K

30 km

5

52.61

400

V, H

1.1 K

30 km

6

53.24

400

V, H

1.1 K

30 km

7

53.75

400

V, H

1.1 K

30 km

8

89.0

4000

V, H

1.1 K

10 km

9

118.7503±3.2

2x500

V

1.3 K

10 km

10

118.7503±2.1

2x400

V

1.3 K

10 km

11

118.7503±1.4

2x400

V

1.3 K

10 km

12

118.7503±1.2

2x400

V

1.3 K

10 km

13

165.5±0.75

2x1350

V

1.2 K

10 km

14

183.31±7.0

2x2000

V

1.3 K

10 km

15

183.31±6.1

2x1500

V

1.2 K

10 km

16

183.31±4.9

2x1500

V

1.2 K

10 km

17

183.31±3.4

2x1500

V

1.2 K

10 km

18

183.31±2.0

2x1500

V

1.3 K

10 km

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

Instrument classification
  • Earth observation instrument
  • Passive microwave radiometer
  • Conical scanning microwave radiometer
Mission objectives
Primary mission objectives
  • Precipitation intensity at surface (liquid or solid)
  • Sea-ice cover
  • Wind speed (near surface)
Secondary mission objectives
  • Atmospheric temperature
  • Cloud ice Total Column
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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
VariableRelevance for measuring this variableOperational limitationsExplanation
Accumulated precipitation (over 24 h)3 - highPoor time sampling.. Time sampling to be interpolated by GEO.MW channels around 19, 23, 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Atmospheric temperature3 - highCoarse vertical resolution.54 and 118 GHz bands. Nearly all-weather sounding
Cloud drop effective radius2 - very highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud ice3 - highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud ice Total Column3 - highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud ice effective radius2 - very highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud liquid water (CLW)2 - very highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Cloud liquid water (CLW) total column2 - very highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54, 118 and 183 GHz
Downward long-wave irradiance at Earth surface5 - marginalHighly indirect.MW channels in bands 54, 118 and 183 GHz to account for downward cloud radiation
Freezing level height in clouds3 - highNo specific limitation.MW channels in the 54 and 118 GHz bands. Inference from the temperature profile
Long-wave Earth surface emissivity5 - marginalLong time series needed.MW channels around 19, 37 and 90 GHz. Emissivity across this MW range inferred by statistical analysis
Melting layer depth in clouds3 - highNo specific limitation.MW channels in the 54 and 118 GHz bands. Inference from the temperature profile
Precipitation intensity at surface (liquid or solid)3 - highNo specific limitation.MW channels around 19, 23, 37 and 90 GHz; and in bands 54, 118 and 183 GHz, insensitive to surface emissivity and providing information on atmospheric structure
Sea-ice cover3 - highNo specific limitation.MW channels around 19, 37 and 90 GHz
Sea-ice type4 - fairNo specific limitation.MW channels around 19, 37 and 90 GHz. Type interpreted as age/roughness
Snow cover3 - highCoarse spatial resolution.MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Snow status (wet/dry)2 - very highCoarse spatial resolution.MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Snow water equivalent2 - very highCoarse spatial resolution.. Ground stations network needed.MW channels around 19, 37 and 90 GHz. Higher frequencies less sensitive to emissivity from ground under snow
Specific humidity2 - very highCoarse vertical resolution.MW channels in the 183 GHz band, and 54 GHz for temperature and liquid water corrections
Integrated Water Vapour (IWV)1 - primaryNo specific limitation.MW channel(s) in the water vapour bands around 23 and 183 GHz
Wind speed (near surface)4 - fairOver sea only.MW channels around 19 and 37 GHz
Upward long-wave irradiance at Earth surface5 - marginalHighly indirect.MW channels is the 54, 118 and 183 GHz bands to infer the impact of clouds on the upward LW radiation