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Volume 16, issue 18
Atmos. Chem. Phys., 16, 12177–12203, 2016
https://doi.org/10.5194/acp-16-12177-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: CHemistry and AeRosols Mediterranean EXperiments (ChArMEx)...

Atmos. Chem. Phys., 16, 12177–12203, 2016
https://doi.org/10.5194/acp-16-12177-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 28 Sep 2016

Research article | 28 Sep 2016

Aerosol optical, microphysical and radiative properties at regional background insular sites in the western Mediterranean

Michaël Sicard1,2, Rubén Barragan1,2, François Dulac3, Lucas Alados-Arboledas4,5, and Marc Mallet6 Michaël Sicard et al.
  • 1Remote Sensing Laboratory, Universitat Politècnica de Catalunya, Barcelona, Spain
  • 2Ciències i Tecnologies de l'Espai – Centre de Recerca de l'Aeronàutica i de l'Espai/Institut d'Estudis Espacials de Catalunya (CTE-CRAE/IEEC), Universitat Politècnica de Catalunya, Barcelona, Spain
  • 3Laboratoire des Sciences du Climat et de l'Environnement, (IPSL/LSCE), CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
  • 4Dpt. Applied Physics, Faculty of Sciences, University of Granada, Granada, Spain
  • 5Andalusian Institute for Earth System Research (IISTA-CEAMA), Granada, Spain
  • 6Centre National de Recherches Météorologiques, Toulouse, France

Abstract. In the framework of the ChArMEx (the Chemistry-Aerosol Mediterranean Experiment; http://charmex.lsce.ipsl.fr/) program, the seasonal variability of the aerosol optical, microphysical and radiative properties derived from AERONET (Aerosol Robotic Network; http://aeronet.gsfc.nasa.gov/) is examined in two regional background insular sites in the western Mediterranean Basin: Ersa (Corsica Island, France) and Palma de Mallorca (Mallorca Island, Spain). A third site, Alborán (Alborán Island, Spain), with only a few months of data is considered for examining possible northeast–southwest (NE–SW) gradients of the aforementioned aerosol properties. The AERONET dataset is exclusively composed of level 2.0 inversion products available during the 5-year period 2011–2015. AERONET solar radiative fluxes are compared with ground- and satellite-based flux measurements. To the best of our knowledge this is the first time that AERONET fluxes are compared with measurements at the top of the atmosphere. Strong events (with an aerosol optical depth at 440 nm greater than 0.4) of long-range transport aerosols, one of the main drivers of the observed annual cycles and NE–SW gradients, are (1) mineral dust outbreaks predominant in spring and summer in the north and in summer in the south and (2) European pollution episodes predominant in autumn. A NE–SW gradient exists in the western Mediterranean Basin for the aerosol optical depth and especially its coarse-mode fraction, which all together produces a similar gradient for the aerosol direct radiative forcing. The aerosol fine mode is rather homogeneously distributed. Absorption properties are quite variable because of the many and different sources of anthropogenic particles in and around the western Mediterranean Basin: North African and European urban areas, the Iberian and Italian peninsulas, most forest fires and ship emissions. As a result, the aerosol direct forcing efficiency, more dependent to absorption than the absolute forcing, has no marked gradient.

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The seasonal variability of the aerosol optical, microphysical and radiative properties at three insular sites in the western Mediterranean Basin is presented. The main drivers of the observed annual cycles and NE–SW gradients are mineral dust outbreaks in summer and European continental aerosols in spring. The lack of NE–W gradients of some aerosol properties is attributed to a homogeneous spatial distribution of the fine particle load and absorption low values in the southwesternmost site.
The seasonal variability of the aerosol optical, microphysical and radiative properties at three...
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