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  • 1980-1984  (7)
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  • 1
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    Infrared parameterization and simple climate models (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The geographical distribution of the annual mean and the annual cycle in surface temperature and satellite-observed IR is examined, and the spherical harmonic representation of the data fields is exploited to demonstrate how variances and covariances are dominated by the largest space and time scales. The geographical distribution of the annual cycle in the T and IR fields is explored; the strong imprint of the continents in both is clearly evident. The influence of the cloudiness of seasonal precipitation regimes on the IR annual cycle is also quite striking, especially over the subtropics. Analysis of the data shows that the simple form IR = A+BT (with A = 204 W/sq m and B = 1.93 W/sq m/K) explains 90 percent of the area-weighted variance in the annual mean and annual cycle of the zonally averaged IR field.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Climate and Applied Meteorology (ISSN 0733-3021); 23; 1222-123
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Deconvolution of wide field-of-view radiometer measurements of earth-emitted radiation. II - Analysis of first year of Nimbus 6 ERB data (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The theory of deconvolution considered by Smith and Green (1981) is applied to Nimbus 6 data in order to interpret the data with the maximum obtainable resolution. Attention is given to the data sample, sun-contaminated measurements, the measurement model, the deconvolution, the degree variance, the spherical harmonic coefficients, the geographical distribution of longwave radiation, time histories of zonal coefficients, and the effect of a grid system. Degree variance plots for 12 months of longwave radiation data show that the limit for a spherical harmonic representation of the Nimbus 6 wide field-of-view longwave data is 12th degree. The degree variance plots also reveal that most of the power is in the lower degree terms. Contour maps of the radiation field show the geographical distribution of earth emitted radiant exitance for each month.
    Keywords: GEOPHYSICS
    Type: Journal of the Atmospheric Sciences; 38; Mar. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Annual cycle and spatial spectra of earth emitted radiation at large scales (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Monthly averaged, resolution enhanced global distributions of the earth's emitted radiation, as measured by the Nimbus-6 Earth Radiation Budget (ERB) wide field of view radiometers, have been analyzed for 1 year of data from July 1975 to June 1976. These distributions are expressed in terms of spherical harmonic coefficients, and time and space variability of the emitted radiation field is studied in terms of these coefficients. The average annual distribution accounts for 78 percent of the space-time power, and the annual cycle accounts for 17 percent of the power. Spatial variations over the globe are described in terms of degree variance, and longitudinal variations are described in terms of spectral power as a function of latitude. The longitudinal spectra were found to vary strongly with time.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences (ISSN 0022-4928); 40; April 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Deconvolution and analysis of wide-angle longwave radiation data from Nimbus 6 Earth radiation budget experiment for the first year (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: One year of longwave radiation data from July 1975 through June 1976 from the Nimbus 6 satellite Earth radiation budget experiment is analyzed by representing the radiation field by a spherical harmonic expansion. The data are from the wide field of view instrument. Contour maps of the longwave radiation field and spherical harmonic coefficients to degree 12 and order 12 are presented for a 12 month data period.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TP-1746 , L-13873
    Format: application/pdf
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  • 5
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    Time and space spectra of earth-emitted radiation at large scales (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Several earth radiation instruments have been flown on spacecraft. The most recent of these instruments has been the Earth Radiation Budget (ERB) instrument aboard the Nimbus 6 and Nimbus 7 spacecraft. The ERB instrument includes two earth-viewing wide-field-of-view (WFOV) radiometers one of which measures total irradiance and the other measures shortwave (SW) irradiances. he difference between the two irradiances is the longwave (LW) or earth-emitted irradiance. The ERB instrument has been providing WFOV measurements since July 1975. These WFOV data are suitable for studying large-scale processes over spatial scales of thousands of kilometers. The present investigation is concerned with a study of the annual cycle of the distribution of the earth's LW radiation. This study is based on one year of WFOV data, from July 1975 through June 1976. The present investigation is an extension of the study by Bess and Smith (1979).
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Atmospheric Radiation; Jun 16, 1981 - Jun 18, 1981; Toronto; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Statistical theory for estimating sampling errors of regional radiation averages based on satellite measurements (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The processes which determine the weather and climate are driven by the radiation received by the earth and the radiation subsequently emitted. A knowledge of the absorbed and emitted components of radiation is thus fundamental for the study of these processes. In connection with the desire to improve the quality of long-range forecasting, NASA is developing the Earth Radiation Budget Experiment (ERBE), consisting of a three-channel scanning radiometer and a package of nonscanning radiometers. A set of these instruments is to be flown on both the NOAA-F and NOAA-G spacecraft, in sun-synchronous orbits, and on an Earth Radiation Budget Satellite. The purpose of the scanning radiometer is to obtain measurements from which the average reflected solar radiant exitance and the average earth-emitted radiant exitance at a reference level can be established. The estimate of regional average exitance obtained will not exactly equal the true value of the regional average exitance, but will differ due to spatial sampling. A method is presented for evaluating this spatial sampling error.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Aerospace and Aeronautical Meteorology; Jun 06, 1983 - Jun 09, 1983; Omaha, NE
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Zonal and hemispheric variability of Nimbus 6 ERB longwave radiation (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Radiation variability on a global and zonal scale is studied using outgoing longwave radiation data from the Nimbus 6 satellite for a period of 12 months. The analysis-of-variance technique, which permits the variance to be separated into spatial variance and time variance, is applied to latitudinal zones and to the Northern and Southern Hemispheres. For latitudinal zones, most of the variability of longwave radiation is in the tropics and subtropics and is due to spatial variance between regions within zones. Spatial variance in the Southern Hemisphere is much greater than in the Northern Hemisphere; daytime spatial variance is higher than nighttime spatial variance for both hemispheres.
    Keywords: GEOPHYSICS
    Type: Conference on Atmospheric Radiation; Oct 31, 1983 - Nov 04, 1983; Baltimore, MD
    Format: text
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