Surface shortwave radiative forcing of different aerosol types in the central Mediterranean

TitleSurface shortwave radiative forcing of different aerosol types in the central Mediterranean
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2008
AuthorsDi Sarra, Alcide, Pace G., Meloni Daniela, De Silvestri L., Piacentino S., and Monteleone F.
JournalGeophysical Research Letters
Keywordsaerosol, aerosol optical depth, Atmospheric aerosols, Atmospheric optics, Atmospheric radiation, biomass burning, data set, ground-based measurement, irradiance, irradiation, Mediterranean region, Mediterranean Sea, optical depth, Optical variables measurement, radiative forcing, Shortwave irradiance, shortwave radiation, Shortwave radiative forcing, Summer solstice

Ground based measurements of aerosol optical depth, τ, shortwave irradiance at the Mediterranean island of Lampedusa during 2003 and 2004 were used to estimate the surface aerosol shortwave radiative forcing. The shortwave forcing efficiency (FE) was derived at various solar zenith angles, θ, as the derivative of the shortwave irradiance with respect to τ. Values of FE for different classes of particles, namely desert dust, DD, biomass burning/industrial aerosols, BU, and for the whole dataset are derived. At the summer solstice the daily average FE is -86.4 W/m2 for DD, - 70.5 W/m2 for BU, and -94.0 W/m2 for the whole dataset. The daily aerosol forcing of DD is much larger than for the other aerosol classes due to the combination of larger forcing efficiency and largest optical depths. The estimated average daily forcing at the summer solstice and equinox for DD is -30 and -24 W/m2, respectively. Copyright 2008 by the American Geophysical Union.


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