Examining The Causes And Effects Of Downward
Ultraviolet Irradiance Reductions In Los Angeles
Author(s)
M.Z. Jacobson
Abstract
In 1973 and 1987, downward ultraviolet (UV) irradiance measurements within
the boundary layer in Los Angeles were as much as 50% less than those above
the boundary layer. Downward total solar irradiances reductions were no more
than 14% in both cases. Standard paniculate absorbers and scatterers can account
for only part of the observed UV reductions. It is hypothesized that absorption by
organic material, most likely nitrated aromatics, benzaldehydes, benzoic acids,
aromatic polycarboxylic acids, phenols, and polycyclic aromatic hydrocarbons,
and absorption by nitrated inorganics, caused much of the additional reductions.
This finding uncovers previously ignored sources of UV light absorption. In Los
Angeles, the finding is important since UV reductions were estimated to cause a
5-8% decrease
Keywords
Related Book
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