Record Display for the EPA National Library Catalog


Main Title Latitudinal and Seasonal Variation in Calculated Ultraviolet-B Irradiance for Rice-Growing Regions of Asia.
Author Bachelet, D. ; Barnes, P. W. ; Brown, D. ; Brown, M. ;
CORP Author ManTech Environmental Technology, Inc., Corvallis, OR. ;Oregon State Univ., Corvallis. Coll. of Oceanography.;Corvallis Environmental Research Lab., OR.
Publisher c1991
Year Published 1991
Report Number EPA-68-C8-0006; EPA/600/J-91/193;
Stock Number PB91-240499
Additional Subjects Seasonal variations ; Ultraviolet rays ; Rice ; Latitude ; Asia ; Ozone ; Farm crops ; Thailand ; Elevation ; Climate ; Cloud cover ; Reprints ; Oryza sativa
Library Call Number Additional Info Location Last
NTIS  PB91-240499 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
Ultraviolet-B (UV-B, 280-320 nm) irradiance was calculated for more than 1200 sites in Asia to characterize the spatial and temporal variation in the present UV-B climate for rice-growing regions. The analytical model of Green et al. was used to compute UV-B irradiance for clear skies using satellite-observed ozone column thickness and local elevation data. Ground-based observations of cloud cover were then used to approximate the average effect of cloud cover on UV-B irradiance using the approach of Johnson et al. Over the geographic range of rice cultivation, the maximum daily effective UV-B irradiance (UV-B(sub BE)) when weighted according to a general plant action spectrum, was found to vary approximately 2.5-fold under both clear and cloudy sky conditions. Under a climate resulting from a doubling of atmospheric carbon dioxide, estimated UV-B using predicted cloud cover was found to change by up to 17% from present conditions in Thailand. Both latitudinal and seasonal variation in solar UV-B radiation may be important aspects of the UV-B climate for rice as cultivars differ in sensitivity to UV-B and are grown under diverse conditions and locations.