BackForwardInstrument:  ATMS 

Instrument details
Acronym ATMS
Full name Advanced Technology Microwave Sounder
Purpose Temperature and humidity sounding in nearly-all-weather conditions.  Also precipitation
Short description 22 channels including the 54 and 183 GHz bands; cross-track scanning [see detailed characteristics below]
Background Development merging AMSU-A flown on NOAA 15 to 19 and AMSU-B on NOAA 15 to 17
Scanning Technique Cross-track: 96 steps of 16 km s.s.p., swath 2200 km - Along-track: one 16-km line every 8/3 s
Resolution 16 km s.s.p. for channels 165-183 GHz, 32 km for channels 50-90 GHz, 75 km for channels 23-32 GHz
Coverage / Cycle Near-global coverage twice/day
Mass 75.4 kg Power 93 W Data Rate 20 kbps

 

Providing Agency NASA
Instrument Maturity Flown on operational programme
Utilization Period: 2012-03-06 to ≥2038
Last update: 2017-03-29
Detailed characteristics
Central frequency (GHz) Bandwidth (MHz) Quasi-polarisation NEΔT
23.800 270 QV 0.90 K
31.400 180 QV 0.90 K
50.300 180 QH 1.20 K
51.760 400 QH 0.75 K
52.800 400 QH 0.75 K
53.596 ± 0.115 170 QH 0.75 K
54.400 400 QH 0.75 K
54.940 400 QH 0.75 K
55.500 330 QH 0.75 K
f0 = 57.290344 330 QH 0.75 K
f0 ± 0.217 78 QH 1.20 K
f0 ± 0.3222  ± 0.048 36 QH 1.20 K
f0 ± 0.3222  ± 0.022 16 QH 1.50 K
f0 ± 0.3222  ± 0.010 8 QH 2.40 K
f0 ± 0.3222  ± 0.0045 3 QH 3.60 K
89.5 5000 QV 0.50 K
165.5 3000 QH 0.60 K
183.31 ± 7.0 2000 QH 0.80 K
183.31 ± 4.5 2000 QH 0.80 K
183.31 ± 3.0 1000 QH 0.80 K
183.31 ± 1.8 1000 QH 0.80 K
183.31 ± 1.0 500 QH 0.90 K
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
  • Cross-track, special or non-scanning microwave radiometer
Mission objectives
Primary mission objectives
  • Atmospheric temperature
  • Specific humidity
Secondary mission objectives
  • Cloud ice (total column)
  • Cloud liquid water (CLW) total column
  • Freezing level height in clouds
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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
Atmospheric temperature2 - very highCoarse vertical resolution.Many MW channels in the 54 GHz band. Nearly all-weather sounding
Cloud drop effective radius4 - fairNo specific limitation.MW channels around 37 and 90 GHz, and in 54 and 183 GHz bands
Cloud ice3 - highNo specific limitation.MW channels around 37 and 90 GHz, and in 54 and 183 GHz bands
Cloud ice (total column)2 - very highNo specific limitation.MW channels around 37 and 90 GHz, and in 54 and 183 GHz bands
Cloud ice effective radius4 - fairNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Cloud liquid water (CLW)3 - highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Cloud liquid water (CLW) total column2 - very highNo specific limitation.MW channels around 37 and 90 GHz, and in bands 54 and 183 GHz
Downward long-wave irradiance at Earth surface5 - marginalHighly indirect.MW channels in bands 54 and 183 GHz to account for downward cloud radiation
Freezing level height in clouds3 - highNo specific limitation.MW channels in the 54 GHz band. Inference from the temperature profile
Melting layer depth in clouds3 - highNo specific limitation.MW channels in the 54 GHz band. Inference from the temperature profile
Precipitation intensity at surface (liquid or solid)2 - very highNo specific limitation.MW channels in the 54 and 183 GHz bands. Suitable for solid and liquid precipitation over sea and land, Insensitive to surface emissivity
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
Upward long-wave irradiance at Earth surface4 - fairHighly indirect.MW channels is the 54 and 183 GHz bands to infer the impact of clouds on the upward LW radiation