Preprints
https://doi.org/10.5194/acp-2020-1013
https://doi.org/10.5194/acp-2020-1013

  24 Nov 2020

24 Nov 2020

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Aerosol radiative effect during the summer 2019 heatwave produced partly by an inter-continental Saharan dust outbreak. 1. Shortwave dust-induced direct impact

Carmen Córdoba-Jabonero1, Michaël Sicard2,3, María-Ángeles López-Cayuela1, Albert Ansmann4, Adolfo Comerón2, María-Paz Zorzano5,6, Alejandro Rodríguez-Gómez2, and Constantino Muñoz-Pocar2 Carmen Córdoba-Jabonero et al.
  • 1Instituto Nacional de Técnica Aeroespacial (INTA), Atmospheric Research and Instrumentation Branch, Torrejón de Ardoz, 28850-Madrid, Spain
  • 2CommSensLab, Dept. of Signal Theory and Communications, Universitat Politècnica de Catalunya (UPC), 08034-Barcelona, Spain
  • 3Ciències 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 (UPC), 08034-Barcelona, Spain
  • 4Leibniz Institute for Tropospheric Research (TROPOS), 04318-Leipzig, Germany
  • 5Centro de Astrobiología (CSIC-INTA), Ctra. Ajalvir, km. 4, Torrejón de Ardoz, 28850-Madrid, Spain
  • 6School of Geosciences, University of Aberdeen, Aberdeen, AB24 3FX, UK

Abstract. The shortwave (SW) direct radiative effect during the summer 2019 heatwave produced partly by a moderate, long-lasting Saharan dust outbreak over Europe is analysed in this study. Two European sites (periods) are considered: Barcelona, Spain, (23–30 June) and Leipzig, Germany (29–30 June). Major data are obtained from AERONET and MPLNET observations. Modelling is used to describe the different dust pathways. The dust coarse (Dc) and fine (Df) components (total dust, DD = Dc + Df) are separated in the profiles of the total particle backscatter coefficient using the POLIPHON method in synergy with MPLNET measurements. This information is used to calculate the relative mass loading and the centre-of-mass height, as well as the contribution of each dust mode to the DD radiative effect (DRE). The mean dust optical depth and its Df / DD ratios are, respectively, 0.153 and 24 % in Barcelona and 0.039 and 38 % in Leipzig. The dust produced a cooling effect on the surface with a daily mean DRE (Df / DD DRE ratio) of −9.1 W m−2 (37 %) in Barcelona and −2.5 W m−2 (52 %) in Leipzig. Although less intense than on surface, a cooling is also observed at the top-of-the-atmosphere (TOA), where the Df / DD DRE ratio is even though higher (45 % and 60 %, respectively, in Barcelona and Leipzig). Despite the predominance of Dc particles under dusty conditions, the SW radiative impact of Df particles can be comparable to, even higher than, that induced by the Dc ones. In particular, the Df / DD DRE ratio in Barcelona increases by +2.4 % (surface) and +2.9 % (TOA) day−1 along the dusty period. These results are especially relevant for the next ESA EarthCARE mission (planned in 2022), as devoted to aerosol-cloud-radiation interaction research.

Carmen Córdoba-Jabonero et al.

 
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Status: closed
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Carmen Córdoba-Jabonero et al.

Carmen Córdoba-Jabonero et al.

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Short summary
The particular pathway of the dust outbreaks defines the aerosol scenario, and hence, the SW direct dust radiative effects (DRE). The synergetic use of POLIPHON method with continuous P-MPL measurements allows evaluating separately the radiative effect of both dust coarse (Dc) and fine (Df) particles. A dust-induced cooling effect is found, and despite Dc usually dominate for intense dust events, the Df contribution to the total DRE can be significant, being higher at the TOA than on surface.
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