HR: 11:15h
AN: A11G-04    [PDF]
TI: An Expanded UV Irradiance Database from TOMS Including the Effects of Ozone, Clouds, and Aerosol Attenuation
AU: * Herman, J R
EM: herman@tparty.gsfc.nasa.gov
AF: Goddard Space Flight Center, NASA/GSFC Code 916, Greenbelt, MD 20771 United States
AU: Krotkov, N
EM: krotkov@carioca.gsfc.nasa.gov
AF: Goddard Space Flight Center, NASA/GSFC Code 916, Greenbelt, MD 20771 United States
AB: The TOMS UV irradiance database (1978 to 2003) has been expanded to include 5 new products (noon irradiance at 305, 310, 324, and 380 nm, and noon erythemal-weighted irradiance), in addition to the existing erythemal daily exposure, that permit direct comparisons with ground-based measurements from spectrometers and broadband instruments. The new data are available on http://toms.gsfc.nasa.gov. Comparisons of the TOMS estimated irradiances with ground-based instruments are given along with a review of the sources of known errors, especially the recent improvements in accounting for aerosol attenuation. Trend estimations from the new TOMS irradiances permit the clear separation of changes caused by ozone and those caused by aerosols and clouds. Systematic differences in cloud cover are shown to be the most important factor in determining regional differences in UV radiation reaching the ground for locations at the same latitude (e.g., the summertime differences between Australia and the US southwest). Regional and seasonal ozone differences are most important at higher latitudes in both hemispheres for causing high values of UVB irradiances.
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0360 Transmission and scattering of radiation
DE: 1640 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting