HR: 16:50h
AN: A54B-03 INVITED [Abstracts]
TI: The Effects of Aerosol on Atmospheric UV Radiation: Measurements and Modeling from the MILAGRO Field Campaign
AU: * Madronich, S
EM: sasha@ucar.edu
AF: National Center for Atmospheric Research, P.O.Box 3000, Boulder, CO 80307, United
States
AU: Hall, S
EM: halls@ucar.edu
AF: National Center for Atmospheric Research, P.O.Box 3000, Boulder, CO 80307, United
States
AU: Shetter, R
EM: shetter@ucar.edu
AF: National Center for Atmospheric Research, P.O.Box 3000, Boulder, CO 80307, United
States
AU: Slusser, J
EM: sluss@uvb.nrel.colostate.edu
AF: Colorado State University, Canyon Suite 226, Fort Collins, CO 80523, United States
AU: Arnott, P
EM: pat@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway
, Reno, NV 89512, United States
AB:
The MILAGRO field campaign took place in and near Mexico City 1-30 March 2006. A comprehensive data set
was obtained on atmospheric chemical composition (gas and aerosol), aerosol microphysics, spectral radiation,
and meteorology from surface-, aircraft-, and satellite-based instruments. For much of this time, the lower
atmosphere was laden with large amounts of aerosols originating from urban and industrial sources, biomass
fires, and wind-blown dust. Spectral radiation measurements are available from filter radiometers and
spectroradiometers, and span ultraviolet (UV) wavelengths important to surface biota and tropospheric
photochemistry. By combining the spectral radiation measurements, aerosol composition, optical, and
microphysical measurements, and modeling, an assessment is now possible on how aerosols affect surface
UV radiation (e.g. DNA damage, erythema, vitamin-D production) and vertical profiles of photolysis frequencies
(e.g. JNO2, JO3(O1D), JCH2O, JHONO). Interactions between aerosol-scattered radiation and absorption by
gaseous pollutants (esp. O3, SO2, and NO2) can also be evaluated. Implications for human health and
photochemical oxidant formation will be discussed.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0360 Radiation: transmission and scattering
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly