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| Titel |
Estimation of mineral dust long-wave radiative forcing: sensitivity study to particle properties and application to real cases in the region of Barcelona |
| VerfasserIn |
M. Sicard, S. Bertolín, M. Mallet, P. Dubuisson, A. Comerón |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 17 ; Nr. 14, no. 17 (2014-09-08), S.9213-9231 |
| Datensatznummer |
250119010
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| Publikation (Nr.) |
 copernicus.org/acp-14-9213-2014.pdf |
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| Zusammenfassung |
| The aerosol radiative effect in the long-wave (LW) spectral range is
sometimes not taken into account in atmospheric aerosol forcing studies at
local scale because the LW aerosol effect is assumed to be negligible. At
regional and global scale this effect is partially taken into account:
aerosol absorption is taken into account but scattering is still neglected.
However, aerosols with strong absorbing and scattering properties in the LW
region, like mineral dust, can have a non-negligible radiative effect in the
LW spectral range (both at surface and top of the atmosphere) which can
counteract their cooling effect occurring in the short-wave spectral range.
The first objective of this research is to perform a sensitivity study of
mineral dust LW radiative forcing (RF) as a function of dust microphysical
and optical properties using an accurate radiative transfer model which can
compute vertically resolved short-wave and long-wave aerosol RF. Radiative
forcing simulations in the LW range have shown an important sensitivity to
the following parameters: aerosol load, radius of the coarse mode,
refractive index, aerosol vertical distribution, surface temperature and
surface albedo. The scattering effect has been estimated to contribute to
the LW RF up to 18% at the surface and up to 38% at the top of the
atmosphere. The second objective is the estimation of the short-wave and
long-wave dust RF for 11 dust outbreaks observed in Barcelona. At the
surface, the LW RF varies between +2.8 and +10.2 W m−2,
which represents between 11 and 26% (with opposite sign) of the SW
component, while at the top of the atmosphere the LW RF varies between
+0.6 and +5.8 W m−2, which represents between 6 and 26% (with opposite sign) of the SW component. |
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