Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-9-15673-2009
http://www.atmos-chem-phys-discuss.net/9/15673/2009/
http://www.atmos-chem-phys-discuss.net/9/15673/2009/acpd-9-15673-2009.html
http://www.atmos-chem-phys-discuss.net/9/15673/2009/acpd-9-15673-2009.pdf
15673
15723
2009-07-24
Extreme Saharan dust event over the southern Iberian Peninsula in september 2007: active and passive remote sensing from surface and satellite
J. L. Guerrero-Rascado
F. J. Olmo
I. Avilés-RodrÃguez
F. Navas-Guzmán
D. Pérez-RamÃrez
H. Lyamani
L. Alados Arboledas
alados@ugr.es
Departamento de FÃsica Aplicada, Facultad de Ciencias, Universidad de Granada, Fuentenueva s/n, 18071, Granada, Spain
Centro Andaluz de Medio Ambiente (CEAMA), Junta de AndalucÃa-Universidad de Granada, Av. del Mediterráneo s/n, 18071, Granada, Spain
This study investigates aerosol optical properties during the extreme Saharan dust event
detected from 3 to 7 September 2007 over Granada, southern Iberian Peninsula, with both
active and passive remote sensing instrumentation from surface and satellite. The intensity
of the event was visualized on the aerosol optical depth series obtained by the
sun-photometer Cimel CE 318-4 operated at Granada in the framework of AERONET from August
2004 until December 2008 (level 2 data). A combination of large aerosol optical depth
(0.86–1.50) at 500 nm, and reduced Angström exponent (0.1–0.25) in the range
440–870 nm, was detected on 6 September during daytime. This Saharan dust event
also affected other Iberian Peninsula stations included in AERONET (El Arenosillo and
Évora stations). During the most intense stage, on 6 September, maximum aerosol
backscatter values were a factor of 8 higher than other maxima during this Saharan dust
event. Values up to 1.5×10<sup>−2</sup> km<sup>−1</sup> sr<sup>−1</sup> at 355 and 532 nm
were detected in the layer with the greatest aerosol load between 3–4 km a.s.l.,
although aerosol particles were also detected up to 5.5 km a.s.l. In this stage of
the event, dust particles at these altitudes showed a backscatter-related Angström
exponent between −0.44 and 0.53 for the two spectral intervals considered. The results
from different measurements (active/passive and ground-based/satellite) reveal the
importance of performing multi-instrumental measurements to properly characterize the
contribution of different aerosol types from different sources during extreme events.
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