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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/47097

Title: Aerosol transport over the western Mediterranean basin: Evidence of the contribution of fine particles to desert dust plumes over Alborán Island
Authors: Valenzuela, A.
Olmo Reyes, Francisco José
Granados-Muñoz, María José
Antón, Manuel
Guerrero-Rascado, Juan Luis
Quirantes Sierra, Arturo
Toledano, C.
Pérez-Ramírez, Daniel
Alados-Arboledas, Lucas
Issue Date: 27-Dec-2014
Abstract: Eight months (June 2011 to January 2012) of aerosol property data were obtained at the remote site of Alborán Island (35.95°N, 3.03°W) in the western Mediterranean basin. The aim of this work is to assess the aerosol properties according to air mass origin and transport over this remote station with a special focus on air mass transport from North Africa. For air masses coming from North Africa, different aerosol properties showed strong contributions from mineral dust lifted from desert areas. Nevertheless, during these desert dust intrusions, some atmospheric aerosol properties are clearly different from pure mineral dust particles. Thus, Angström exponent α(440–870) presents larger values than those reported for pure desert dust measured close to dust source regions. These results combine with α(440, 670) − α(670, 870) ≥ 0.1 and low single scattering albedo (ω(λ)) values, especially at the largest wavelengths. Most of the desert dust intrusions over Alborán can be described as a mixture of dust and anthropogenic particles. The analyses support that our results apply to North Africa desert dust air masses transported from different source areas. Therefore, our results indicate a significant contribution of fine absorbing particles during desert dust intrusions over Alborán arriving from different source regions. The aerosol optical depth data retrieved from Sun photometer measurements have been used to check Moderate Resolution Imaging Spectroradiometer retrievals, and they show reasonable agreement, especially for North African air masses.
Sponsorship: This work was supported by the Andalusia Regional Government through projects P12-RNM-2409 and P10-RNM-6299, by the Spanish Ministry of Science and Technology through projects CGL2010-18782 and CGL2013-45410-R, by the EU through ACTRIS project (EU INFRA-2010-1.1.16-262254), and by the University of Granada through the contract “Plan Propio. Programa 9. Convocatoria 2013.” CIMEL Calibration was performed at the AERONET-EUROPE calibration center (http://aeronet.gsfc.nasa.gov), supported by ACTRIS (European Union Seventh Framework Program (FP7/2007-2013) under grant agreement 262254). Granados-Muñoz was funded under grant AP2009-0552. ALFA database computation was partly supported by RES (Spanish Supercomputation Network) computing resources (projects AECT-2009-1-0012 and AECT-2011-3-0016).
Publisher: American Geophysical Union (AGU)
Keywords: Aerosol property
Alborán Island
Mineral dust
Air masses
Moderate Resolution Imaging Spectroradiometer (MODIS)
URI: http://hdl.handle.net/10481/47097
ISSN: 2169-8996
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Valenzuela, A.; et al. Aerosol transport over the western Mediterranean basin: Evidence of the contribution of fine particles to desert dust plumes over Alborán Island. Journal of Geophysical Research: Atmospheres, 119(24): 14028-14044 (2014). [http://hdl.handle.net/10481/47097]
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