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
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB91-240499 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
14p |
Abstract |
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. |