[ISO_Topic_Category='IMAGERY/BASE MAPS/EARTH COVER']
Narrow Field Of View Data Products from Nimbus-7 Earth Radiation BudgetEntry ID: ERB_NFOV
Abstract: Four Narrow-Field-of-View (NFOV) Nimbus-7 Earth Radiation Budget (ERB) products are described: Scene Radiance Tape (SRT), Maximum Likelihood Cloud Estimation (MLCE), Sorting into Angular Bins (SAB), and NFOV-MATRIX. These four products are derived from the Nimbus-7 ERB scanner measurements. The ERB scanner operated from November 16, 1978 to June 20, 1980. The four data sets cover the following ... periods:
78-098A-07R SRT 1979-05-01 to 1980-05-31
78-098A-07S MLCE 1979-05-01 to 1980-05-31
78-098A-07T SAB 1979-05-01 to 1980-05-31
78-098A-07U NFOV-MATRIX 1978-11-16 to 1980-06-20
The Scene Radiance Tape (SRT) contains Nimbus-7 ERB scanner (NFOV) measurements for the period May 1979 through May 1980. The data were derived from the ERB Master Archival Tape (MAT) and sorted by subtarget area (STA) and satellite viewing angle. The data were binned into 18,630 fixed STAs and 49 angular bins. Each STA contains calibrated and corrected shortwave (0.2 to 5 micrometers) and longwave (5 to 50 micrometers) radiances. Radiance statistics, bidirectional reflectances, populations, solar insolation, and solar zenith angles are also given. The SRT data set is similar in format to the SubTarget Radiance Tape (STRT) but contains no geographic or cloud scene information. The data set did not cover the period before May 1979 due to inadequate sampling and budget constraints.
The Maximum Likelihood Cloud Estimation (MCLE) data set uses the MCLE algorithm to derive total upward flux from an observed region from NFOV radiances measured by the scanner instrument on ERB. The MCLE algorithm is similar to an algorithm derived for use with the ERBE data. The MCLE data set gives better regional and temporal resolution than the Sorting into Angular Bins (SAB) algorithm. The MCLE is a statistical procedure for converting NFOV radiances into flux estimates. The MCLE data set consists of daily and monthly averages at ERB Subtarget areas (STA), zonal daily means in 4.5 degree latitude zones, and zonal and angular bin data grouped into 49 satellite-viewing angle bins. The MLCE data set also contains percentages of clear and cloudy observations in each scene.
The Sorting into Angular Bins (SAB) data set was derived from the ERB scanner (NFOV) measurements. The SAB algorithm was used to estimate the total upward flux from an observed region. The SAB algorithm is based on the scanning geometry of the Nimbus 7 ERB scanner to derive upwelling radiance with information on bidirectional reflectance and emittance patterns. The SAB data consist of monthly averaged albedos, outgoing longwave radiation, shortwave radiation and net radiation for 2,070 (500x500 km) fixed target areas.
The NFOV-MATRIX data set was generated from the ERB MATRIX data set. The original ERB MATRIX dataset contained both WFOV and NFOV measurements. The MATRIX data set was replaced with a new WFOV MATRIX data set and the NFOV MATRIX data was extracted and archived as a separate data set. The NFOV MATRIX data set consists of albedo, longwave flux, and net radiation on a world grid.
The Nimbus 7 research-and-development satellite served as a stabilized, earth-oriented platform for the testing of advanced systems for sensing and collecting data in the pollution, oceanographic and meteorological disciplines. The polar-orbiting spacecraft consisted of three major structures: (1) a hollow torus-shaped sensor mount, (2) solar paddles, and (3) a control housing unit that was connected to the sensor mount by a tripod truss structure.
Start Date: 1978-11-16Stop Date: 1980-06-20
ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY
ATMOSPHERE > CLOUDS > CLOUD RADIATIVE TRANSFER > CLOUD RADIATIVE FORCING
ATMOSPHERE > ATMOSPHERIC RADIATION > ALBEDO
ATMOSPHERE > ATMOSPHERIC RADIATION > ATMOSPHERIC EMITTED RADIATION
ATMOSPHERE > ATMOSPHERIC RADIATION > HEAT FLUX
ATMOSPHERE > ATMOSPHERIC RADIATION > NET RADIATION
ATMOSPHERE > ATMOSPHERIC RADIATION > SHORTWAVE RADIATION
ATMOSPHERE > ATMOSPHERIC RADIATION > SOLAR IRRADIANCE > INSOLATION
ATMOSPHERE > ATMOSPHERIC RADIATION > SOLAR RADIATION
LAND SURFACE > SURFACE RADIATIVE PROPERTIES > REFLECTANCE > BIDIRECTIONAL REFLECTANCE
LAND SURFACE > SURFACE RADIATIVE PROPERTIES > REFLECTANCE
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED FLUX
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED RADIANCE
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE FLUX
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE RADIANCE
ISO Topic Category
Data Set Progress
Email: gsfc-help-disc at lists.nasa.gov
Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center
Province or State: MD
Postal Code: 20771
Role: DIF AUTHOR
Email: gsfc-gcmduso at mail.nasa.gov
Ardanuy, P.E., L.L.Stowe, A.Gruber, M.Weiss, and C.S.Long, 'Longwave Cloud
Radiative Forcing as Determined From Nimbus-7 Observations', J.Climate,2,pp.766-799, 1980.
Kyle, H.Lee, R.R.Hucek, B.Groveman, and R.Frey, 'User's Guide: Nimbus-7 Earth Radiation Budget Narrow-Field-of-View Products', NASA Reference Publication 1246, November 1990.
Kyle,H.L., K.L.Vasanth, and the Nimbus-7 ERB Experiment Team,'Some
Characteristic Differences in the Earth's Radiation Budget Over Land and Ocean Derived From the Nimbus-7 ERB Experiment',J.Climate Appl. Meteor., 25, pp. 958-981, 1986.
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Last DIF Revision Date: 2014-03-05