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|Title: ||Regional Modeling of Saharan Desert Dust Aerosol Indirect Radiative Forcing|
|Authors: ||Santos, Dina|
Costa, Maria João
Silva, Ana Maria
|Issue Date: ||Sep-2011|
|Publisher: ||6th INTERNATIONAL WORKSHOP ON SAND/ DUSTSTORMS AND ASSOCIATED DUSTFALL|
|Abstract: ||Considering that Sahara desert is considered the most important dust source in the world,
being responsible for up to half of the global dust emissions, this work aims to study the
effects of Saharan desert dust aerosol storms upon clouds.
The method, used in this study, estimates the cloud radiative forcing (aerosol indirect radiative
forcing) in the presence of desert dust aerosols during strong desert dust events that occurred
in the end of May 2006 and in the beginning of September 2007. The assessment of the cloud
radiative forcing (CRF) is made at a regional scale both at the top of the atmosphere (TOA) and
at the surface levels.
The results are obtained from numerical simulations with a mesoscale atmospheric model
(MesoNH) over Portugal area and nearby Atlantic Ocean.
From the results it is possible to observe that, for all days under study, a cooling effect
(negative CRF values) is always found both at the TOA and surface levels and this effect is more
pronounced at the surface than at the TOA. Also, for these two levels and for clouds
developing in a dust free atmosphere, a more pronounced cooling effect is found compared
with the corresponding CRF values for clouds developing in a atmosphere were desert dust
aerosols are present.|
|Appears in Collections:||FIS - Comunicações - Em Congressos Científicos Internacionais|
CGE - Comunicações - Em Congressos Científicos Internacionais
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