NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsMeasuring and modeling near-surface reflected and emitted radiation fluxes at the FIFE siteInformation is presented pertaining to the measurement and estimation of reflected and emitted components of the radiation balance. Information is included about reflectance and transmittance of solar radiation from and through the leaves of some grass and forb prairie species, bidirectional reflectance from a prairie canopy is discussed and measured and estimated fluxes are described of incoming and outgoing longwave and shortwave radiation. Results of the study showed only very small differences in reflectances and transmittances for the adaxial and abaxial surfaces of grass species in the visible and infrared wavebands, but some differences in the infrared wavebands were noted for the forbs. Reflectance from the prairie canopy changed as a function of solar and view zenith angles in the solar principal plane with definite asymmetry about nadir. The surface temperature of prairie canopies was found to vary by as much as 5 C depending on view zenith and azimuth position and on the solar azimuth. Aerodynamic temperature calculated from measured sensible heat fluxes ranged from 0 to 3 C higher than nadir-viewed temperatures. Models were developed to estimate incoming and reflected shortwave radiation from data collected with a Barnes Modular Multiband Radiometer. Several algorithms for estimating incoming longwave radiation were evaluated and compared to actual measures of that parameter. Net radiation was calculated using the estimated components of the shortwave radiation streams, determined from the algorithms developed, and from the longwave radiation streams provided by the Brunt, modified Deacon, and the Stefan-Boltzmann models. Estimates of net radiation were compared to measured values and found to be within the measurement error of the net radiometers used in the study.Document ID19900017062Acquisition SourceLegacy CDMSDocument TypeContractor Report (CR)AuthorsBlad, Blaine L.*(Nebraska Univ. Lincoln, NE, United States)*Walter-Shea, Elizabeth A.*(Nebraska Univ. Lincoln, NE, United States)*Starks, Patrick J.*(Nebraska Univ. Lincoln, NE, United States)*Vining, Roel C.*(Nebraska Univ. Lincoln, NE, United States)*Hays, Cynthia J.*(Nebraska Univ. Lincoln, NE, United States)*Mesarch, Mark A.*(Nebraska Univ. Lincoln, NE, United States)*Date AcquiredSeptember 6, 2013Publication DateJune 1, 1990Subject CategoryEarth Resources And Remote SensingReport/Patent NumberNASA-CR-180953NAS 1.26:180953AG-MET-PR-90-1Accession Number90N26378Funding Number(s)CONTRACT_GRANT: NAG5-894Distribution LimitsPublicCopyrightWork of the US Gov. Public Use Permitted.Available DownloadsNameType19900017062.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsThere are no records associated with this record.visibility_offNo Preview Available
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