Narrow Field Of View (NFOV) Data Products from Nimbus-7 Earth Radiation Budget (ERB)
Entry ID:
ERB_NFOV
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Summary
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 dataset is similar in format to
the SubTarget Radiance Tape (STRT) but contains no geographic or cloud scene
information. The dataset did not cover the period before May 1979 due to
inadequate sampling and budget constraints.
The Maximum Likelihood Cloud Estimation (MCLE) dataset 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 dataset 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 dataset 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 dataset also contains percentages of clear and cloudy observations in
each scene.
The Sorting into Angular Bins (SAB) dataset 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 dataset was generated from the ERB MATRIX dataset. The
original ERB MATRIX dataset contained both WFOV and NFOV measurements. The
MATRIX dataset was replaced with a new WFOV MATRIX dataset and the NFOV MATRIX
data was extracted and archived as a separate dataset. The NFOV MATRIX dataset
consists of albedo, longwave flux, and net radiation on a world grid. 
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 90.0
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S: -90.0
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E: 180.0
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W: -180.0
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Data Resolution
Latitude Resolution:
0.5 degree
Longitude Resolution:
0.5 degree
Horizontal Resolution Range:
50 km - < 100 km or approximately .5 degree - < 1 degree
Vertical Resolution:
64 unequally-spaced sigma levels.
Distribution
Distribution Media:
OPeNDAP from COLA/IGES, GrADS-DODS, LAS
Personnel
Role:
DIF AUTHOR
Email:
gsfc-gcmduso at mail.nasa.gov
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Creation and Review Dates
DIF Creation Date:
2004-11-23
Last DIF Revision Date:
2009-01-08
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