The Nimbus-6 High Resolution Infrared Radiometer (HIRS) and (SCAMS) Merged Level 2 Radiation, Temperature and Humidity Sounding Data for the Global Atmospheric Research Program (GARP) data product contains measurements at standard pressure levels from 1000 to 1 mbar. This product was generated by the former Goddard Applications Directorate on the Atmospheric and Oceanographic Information Processing System (AOIPS) as a data system test in support of the Global Atmospheric Research Program (GARP). The data, originally written on IBM 360 machines, were recovered from 9-track magnetic tapes. The data are archived in their original IBM 32-bit word binary record format, also referred to as a binary TAP file, and contain one orbit of measurements. The HIRS experiment on Nimbus-6 was a follow on to the successful Nimbus-5 ITPR experiment. HIRS was a multi-channel filter radiometer with a Cassegrain telescope before the chopper assembly. The instrument scanned in the cross track direction with 21 scans on each side of the subtrack point with about 30 km x 55 km resolution at nadir. HIRS measured radiances primarily in five spectral regions: (1) seven channels near the 15-micrometer CO2 absorption band, (2) two channels (11.1 and 3.7 micrometers) in the IR window, (3) two channels (8.2 and 6.7 micrometers) in the water vapor absorption band, (4) five channels in the 4.3-micrometer band, and (5) one channel in the visible 0.69-micrometer region. The SCAMS experiment on Nimbus-6 was a follow on to the successful Nimbus-5 NEMS experiment. SCAMS continuously monitored emitted microwave radiation at frequencies of 22.235, 31.65, 52.85, 53.85 and 55.45 GHz. The three channels near the 5.0-mm oxygen absorption band were used primarily to deduce atmospheric temperature profiles. The two channels near 10 mm permitted water vapor and cloud water content over calm oceans to be estimated separately. The instrument, a Dicke-superheterodyne type, scanned +/- 45 degrees normal to the orbital plane with a 10 degree field of view. The three oxygen channels shared common signal and reference antennas. Both water vapor channels had their own signals and reference antennas. The absolute rms accuracy of the oxygen channels was better than 2 Kelvin and that of the water vapor channels better than 1 Kelvin. The HIRS Principal Investigator was Mr. W. L. Smith from the NOAA National Environmental Satellite Service. The SCAMS Principal Investigator was Prof. David H. Staelin from MIT. The Nimbus-6 HIRS and SCAMS merged data are available from August 17, 1975 through March 4, 1976. These data were previously archived at NASA NSSDC under the entry ID ESAD-00017 together with the merged retrieval data set.

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GES_DISC Short Name: HIRSSCAMSN6L2GARP Version ID: 001 Unique ID: C3660442686-GES_DISC

The Nimbus-6 High Resolution Infrared Radiometer (HIRS) Level 1 Calibrated Radiances for the Global Atmospheric Research Program (GARP) data product contains daily infrared radiances. The HIRS was designed to measure surface temperature and albedo, temperature and H2O profiles, cloud liquid water content, cloud amount and outgoing longwave fluxes in the infrared. The data, originally written on IBM 360 machines, were recovered from 9-track magnetic tapes. The data are archived in their original IBM 32-bit word binary record format, also referred to as a binary TAP file, and contain one orbit of measurements. The HIRS experiment on Nimbus-6 is a follow on to the successful Nimbus-5 ITPR experiment. HIRS was a multi-channel filter radiometer with a Cassegrain telescope before the chopper assembly. The instrument scans in the cross track direction with 21 scans on each side of the subtrack point with about 30 km x 55 km resolution at nadir. HIRS measured radiances primarily in five spectral regions: (1) seven channels near the 15-micrometer CO2 absorption band, (2) two channels (11.1 and 3.7 micrometers) in the IR window, (3) two channels (8.2 and 6.7 micrometers) in the water vapor absorption band, (4) five channels in the 4.3-micrometer band, and (5) one channel in the visible 0.69-micrometer region. The HIRS Principal Investigator was Mr. W. L. Smith from the NOAA National Environmental Satellite Service. The Nimbus-6 HIRS data are available from August 17, 1975 (day of year 229) through March 4, 1976 (day of year 238). These data were previously archived at NASA NSSDC under the entry ID ESAD-00017 together with the merged retrieval data set).

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GES_DISC Short Name: HIRSN6L1GARP Version ID: 001 Unique ID: C1273652152-GES_DISC

This data set consists of daily, global grayscale TIFF images derived from radiative temperatures measured in the 11.5 µm window (10.5 µm - 12.5 µm). These data were detected by the Temperature-Humidity Infrared Radiometer (THIR) on board the Nimbus 4, Nimbus 5, and Nimbus 6 satellites, respectively, during 1970-1971, 1973-1975 and 1975. The Nimbus satellites used the THIR 11.5 µm window to measure cloud top or surface temperatures. Note: This data set is not georeferenced and contains some gaps in temporal coverage because of missing data.

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NSIDC_CPRD Short Name: NmTHIR115-1T Version ID: 1 Unique ID: C3442605382-NSIDC_CPRD

The NMCN6L2GARP is the Nimbus-6 Level 2 NMC Data Systems Test for the Global Atmospheric Research Program (GARP) product. The product consists of meterological parameters, such as relative humidity, temperature, wind speed, etc., reported every 6 hours. Data Systems Tests (DST) 5 and 6 were conducted to assess the NMC's numerical analysis and forecasting, and to determine the impact of meteorological satellite data from Nimbus-6 HRIR and SCAMS. DST-5 ran for the period of 30 August to 4 September 1975, and DST-6 was conducted from 29 February to 3 March 1976. The data were recovered from the original magnetic tapes, and are now stored online as orbit files in their original proprietary binary format each with a days worth of data (14 orbits). These data were previously archived at NASA NSSDC under the entry ID ESAD-00094 (old id 775-052A-02B).

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GES_DISC Short Name: NMCN6L2GARP Version ID: 001 Unique ID: C3426980439-GES_DISC

PMRN6L1RAD_CDROM is the gridded Nimbus-6 Pressure Modulated Radiometer (PMR) Level 1 Radiance Data Product. The radiances are measured at CO2 lines in the 15 micron band. The purpose of the PMR experiment is to measure the temperature of the upper stratosphere and mesosphere from 40 to 90 km with a vertical resolution of about 10 km, and 500 km horizontal resolution. This product contains radiances in a daily 4 degree latitude x 10 degree longitude grid format, as well as copies of the original tapes. The data for this product are available from 16 June 1975 to 24 June 1978. The principal investigator for the PMR experiment was Dr. John T. Houghton from Oxford University. This product was created by the Oxford University's Atmospheric, Oceanic and Planetary Physics (AOPP) group. The data are stored on two CD-ROMs in ASCII files of hexadecimal characters, and are available in gzipped Unix tar archive files. The first CD-ROM contains the gridded radiance data and a few original tape data files, the second CD-ROM contains the remaining compressed copies of the original data tapes. The byte-ordering in the data files follows the DEC convention for 16-bit integers of less significant byte first. Normal 2's complement integer storage is assumed.

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GES_DISC Short Name: PMRN6L1RAD_CDROM Version ID: 001 Unique ID: C1432636971-GES_DISC