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Discussion papers
https://doi.org/10.5194/acp-2019-681
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-681
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 Sep 2019

Submitted as: research article | 05 Sep 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

Different strategies to retrieve aerosol properties at night-time with GRASP algorithm

Jose Antonio Benavent-Oltra1,2, Roberto Román3, Juan Andrés Casquero-Vera1,2, Daniel Pérez-Ramírez1,2, Hassan Lyamani1,2, Pablo Ortiz-Amezcua1,2, Andrés Esteban Bedoya-Velásquez2,4, Gregori de Arruda Moreira2,5, África Barreto3,6,7, Anton Lopatin8, David Fuertes8, Milagros Herrera9, Benjamin Torres9, Oleg Dubovik9, Juan Luis Guerrero-Rascado1,2, Philippe Goloub9, Francisco Jose Olmo-Reyes1,2, and Lucas Alados-Arboledas1,2 Jose Antonio Benavent-Oltra et al.
  • 1Department of Applied Physics, University of Granada. 18071, Granada, Spain
  • 2Andalusian Institute for Earth System Research, IISTA-CEAMA, Granada, Spain
  • 3Grupo de Óptica Atmosférica (GOA), Universidad de Valladolid, Valladolid, Spain
  • 4Sciences Faculty, Department of Physics, Universidad Nacional de Colombia, Medellín, Colombia
  • 5Institute of Research and Nuclear Energy (IPEN), São Paulo, Brazil
  • 6Cimel Electronique, Paris, France
  • 7Izaña Atmospheric Research Center, Meteorological State Agency of Spain (AEMET), Spain
  • 8GRASP-SAS, Remote Sensing Developments, Université de Lille, Villeneuve D’ASCQ, 59655, France
  • 9Laboratoire d’Optique Atmosphérique (LOA), UMR8518 CNRS, Université de Lille, Villeneuve D’ASCQ, 59655, France

Abstract. This study evaluates the potential of GRASP algorithm (Generalized Retrieval of Aerosol and Surface Properties) to retrieve continuous day-to-night aerosol properties, both column-integrated and vertically-resolved. The study is focused on the evaluation of GRASP retrievals during an intense Saharan dust event that occurred during the Sierra Nevada Lidar aerOsol Profiling Experiment I (SLOPE I) field campaign. For daytime aerosol retrievals, we combined the measurements of the lidar ground-based from EARLINET (European Aerosol Research Lidar Network) station and sun/sky photometer from AERONET (Aerosol Robotic Network), both instruments co-located in Granada (Spain). However, for night-time retrievals three different combinations of active and passive remote sensing measurements are proposed. The first scheme (N0) uses lidar night-time measurements in combination with the interpolation of sun/sky daytime measurements. The other two schemes combine lidar night-time measurements with night-time aerosol optical depth obtained by lunar photometry either using intensive properties of the aerosol retrieved during sun/sky daytime measurements (N1) or using the moon aureole radiance obtained by sky camera images (N2).

Evaluations of the columnar aerosol properties retrieved by GRASP are done versus standard AERONET retrievals. The coherence of day-to-night evolutions of the different aerosol properties retrieved by GRASP is also studied. The extinction coefficient vertical profiles retrieved by GRASP are compared with the profiles calculated by Raman technique at night-time with differences below 30% for all schemes at 355, 532 and 1064 nm. Finally, the volume concentration and scattering coefficient retrieved by GRASP at 2500 m a.s.l. are evaluated by in-situ measurements at this height at Sierra Nevada Station. The differences between GRASP and in-situ measurements are similar for the different schemes, with differences below 30 % for both volume concentration and scattering coefficient. In general, for the scattering coefficient, the GRASP N0 and N1 show better results than the GRASP N2 schemes, while for volume concentration, GRASP N2 shows the lowest differences against in-situ measurements, around 10 %, for high the aerosol optical depth values.

Jose Antonio Benavent-Oltra et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Jose Antonio Benavent-Oltra et al.
Jose Antonio Benavent-Oltra et al.
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Short summary
In this paper, we use the GRASP algorithm combining different remote sensing measurements to obtain the aerosol vertical and column properties, both day and night-time. The column properties are compared with AERONET products and the vertical properties retrieved by GRASP are compared with insitu measurements at high-altitude station. As originality, we proposed three new schemes to retrieve the night-time aerosol properties.
In this paper, we use the GRASP algorithm combining different remote sensing measurements to...
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