Spatio-temporal monitoring by ground-based and air- and space-borne lidars of a moderate Saharan dust event affecting southern Europe in June 2013 in the framework of the ADRIMED/ChArMEx campaign

Ruben Barragan 1, 2 Michaël Sicard 1, 2 Julien Totems 3 Jean-François Léon 4 François Dulac 3 Marc Mallet 5 Jacques Pelon 6 Lucas Alados-Arboledas 7, 8 Aldo Amodeo 9 P. Augustin 10 Antonella Boselli 9 J. A. Bravo-Aranda 7, 8 P. Burlizzi 11 Patrick Chazette 3 A. Comerón 1 Giuseppe D’amico 9 Philippe Dubuisson 10 Maria José Granados-Muñoz 7, 8 G. Leto 12 J. L. Guerrero-Rascado 7, 8 F. Madonna 9 L. Mona 9 Constantino Muñoz-Porcar 1 Gelsomina Pappalardo 9 M. R. Perrone 9 Véronique Pont 4 F. Rocadenbosch 1, 2 A. Rodriguez-Gomez 1 S. Scollo 13 N. Spinelli 14 G. Titos 7, 8 X. Wang 15, 10 R. Zanmar Sanchez 1, 3
Abstract : During the ADRIMED (Aerosol Direct Radiative Impact on the regional climate in the Mediterranean region) special observation period (SOP-1a), conducted in June 2013 in the framework of the ChArMEx (Chemistry-Aerosol Mediterranean Experiment) project, a moderate Saharan dust event swept the Western and Central Mediterranean Basin (WCMB) from west to east during a 9-day period between 16 and 24 June. This event was monitored from the ground by six EARLINET/ACTRIS (European Aerosol Research Lidar Network/Aerosols, Clouds, and Trace gases Research Infrastructure Network) lidar stations (Granada, Barcelona, Naples, Potenza, Lecce and Serra la Nave) and two ADRIMED/ChArMEx lidar stations specially deployed for the field campaign in Cap d’en Font and Ersa, in Minorca and Corsica Islands, respectively. The first part of the study shows the spatio-temporal monitoring of the dust event during its transport over the WCMB with ground-based lidar and co-located AERONET (Aerosol Robotic Network) Sun-photometer measurements. Dust layer optical depths, Ångström exponents, coarse mode fractions, linear particle depolarization ratios (LPDRs), dust layer heights and the dust radiative forcing estimated in the shortwave (SW) and longwave (LW) spectral ranges at the bottom of the atmosphere (BOA) and at the top of the atmosphere (TOA) with the Global Atmospheric Model (GAME), have been used to characterize the dust event. Peak values of the AERONET aerosol optical depth (AOD) at 440 nm ranged between 0.16 in Potenza and 0.37 in Cap d’en Font. The associated Ångström exponent and coarse mode fraction mean values ranged from 0.43 to 1.26 and from 0.25 to 0.51, respectively. The mineral dust produced a negative SW direct radiative forcing at the BOA ranging from −56.9 to −3.5 W m−2. The LW radiative forcing at the BOA was positive, ranging between +0.3 and +17.7 W m-2. The BOA radiative forcing estimates agree with the ones reported in the literature. At the TOA, the SW forcing varied between −34.5 and +7.5 W m−2. In seven cases, the forcing at the TOA resulted positive because of the aerosol strong absorbing properties (0.83 < single-scattering albedo (SSA) < 0.96). The multi-intrusion aspect of the event is examined by means of air- and space-borne lidar measurements, satellite images and back trajectories. The analysis reported in this paper underline the arrival of a second different intrusion of mineral dust observed over southern Italy at the end of the considered period which probably results in the observed heterogeneity in the dust properties.
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Ruben Barragan, Michaël Sicard, Julien Totems, Jean-François Léon, François Dulac, et al.. Spatio-temporal monitoring by ground-based and air- and space-borne lidars of a moderate Saharan dust event affecting southern Europe in June 2013 in the framework of the ADRIMED/ChArMEx campaign. Air Quality, Atmosphere & Health, Springer, 2017, 10 (3), pp.261-285. ⟨10.1007/s11869-016-0447-7⟩. ⟨insu-01434598⟩

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