Seasonal distribution of aerosol properties over Europe and their impact on UV irradianceстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Abstract. Using the aerosol optical thickness at 550 nm
(550) from MODIS (collection 5) for the 2000–2008 period
combined with the aerosol products from the groundbased
AERONET network since 1996, monthly mean values
of key aerosol parameters have been obtained with 1 degree
resolution over Europe. Additional tests have revealed
a satisfactory quality of the MODIS data, except in a few
cases. Quality assured AERONET data are used for evaluating
the Angstrom exponent, single scattering albedo and
asymmetry factor, and for validating the final aerosol optical
thickness in the UV spectral region. A method for extrapolating
the aerosol parameters into the UV spectral region
is discussed. The aerosol optical thickness distributions
are considered together with meteorological fields from
NOAA NCEP CPC CAMS OPI climatology. The 340 is
shown to vary significantly from approximately 0.01 to 0.9
depending on the season and location. Permanent elevated
aerosol loading over several industrial areas is observed,
which agrees with the output of chemical transport models.
Using radiative transfer modeling, monthly mean UV loss
due to aerosol was estimated. The absolute decrease in UV
indices varies from less than 0.1 to 1.5. The relative UV
attenuation has large spatial and temporal variations (−1%–
−17%) with a minimum towards the northwest and maxima
over several southern local areas (Northern Italy, etc.) during
the warm period.