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Instrument details
Acronym
SI-GDR
Full name
Spectrometer/Interferometer - German Democratic Republic
Purpose
Temperature/humidity profiling and total-column ozone
Short description
Infrared Fourier Transform spectrometer, spectral range 6.25-25 µm, spectral resolution 5 cm-1.
Background
New development - Provided by the German Democratic Republic
Scanning Technique
Nadir-only pointing
Resolution
30 km
Coverage / Cycle
Global in 10 days for cells of 100 km side
Mass
Power
Data Rate
Providing Agency
Roscosmos
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
1976 to 1978
Last update:
2017-03-29
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
Instrument classification
Earth observation instrument Passive optical radiometer or spectrometer Cross-nadir infrared sounder, possibly including VIS channels
WIGOS Subcomponents
No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives Atmospheric temperature Integrated Water Vapour (IWV) Specific humidity Secondary mission objectives
Opportunity objectives Cloud top height Cloud top temperature Land surface temperature O3 Total Column Upward long-wave irradiance at TOA Show all Show fewer
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
Variable Relevance for measuring this variable Operational limitations Explanation
Atmospheric temperature 3 - high Cloud sensitive.. Coarse vertical resolution.. Inaccurate in low troposphere.. Along-track only. Many TIR channels in the 15 micrometer band
Cloud cover 5 - marginal Discontinuous coverage.. Along-track only. TIR channel(s)
Cloud top height 3 - high Discontinuous coverage.. Along-track only. TIR channels in window and in CO2 band for atmospheric column above cloud top
Cloud top temperature 3 - high Discontinuous coverage.. Along-track only. TIR channels in window and water vapour band (for emissivity)
Land surface temperature 4 - fair Cloud sensitive.. Coarse spatial resolution.. Along-track only. TIR split window channels for water vapour correction
O3 Total Column 5 - marginal Cloud sensitive.. Along-track only. TIR channel(s). Ozone lines in band around 9.7 micrometers
Sea surface temperature 4 - fair Cloud sensitive.. Along-track only. TIR split window channels for water vapour correction
Specific humidity 3 - high Cloud sensitive.. Very coarse vertical resolution.. Middle troposphere only.. Along-track only. TIR channels in the water vapour band around 6.3 micrometers
Integrated Water Vapour (IWV) 3 - high Cloud sensitive.. Along-track only. TIR and FIR channels from the 11 micrometers window into the 18 micrometers water vapour rotational band
Upward long-wave irradiance at TOA 5 - marginal Spectral interpolation needed.. Along-track only. TIR and FIR channels in the 11 micrometers window, and in water vapour and CO2 bands around 6.3, 15 and 18 micrometers
Instrument: SI-GDR