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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2018-431
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-431
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Feb 2019

Research article | 04 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Retrieval of aerosol properties from ceilometer and photometer measurements: long-term evaluation with in-situ data and statistical analysis at Montsec (southern Pyrenees)

Gloria Titos1,a, Marina Ealo1,2, Roberto Román3,4, Alberto Cazorla3, Yolanda Sola2, Oleg Dubovik5, Andrés Alastuey1, and Marco Pandolfi1 Gloria Titos et al.
  • 1Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Barcelona, Spain
  • 2Group of Meteorology, Department of Applied Physics, Faculty of Physics, University of Barcelona, Spain
  • 3Andalusian Institute for Earth System Research, IISTA-CEAMA, Granada, Spain
  • 4Grupo de Óptica Atmosférica (GOA), Universidad de Valladolid, Spain
  • 5Laboratoire d'Optique Atmosphérique (LOA), Université Lille, France
  • anow at: Applied Physics Department, University of Granada, Spain

Abstract. Given the need of accurate knowledge of aerosol microphysical and optical properties with height resolution, various algorithms combining vertically-resolved and column integrated aerosol information have been developed in the last years. Here we present new results of vertically-resolved extensive aerosol optical properties (backscattering, scattering and extinction) and volume concentrations retrieved with the GRASP (Generalized Retrieval of Aerosol and Surface Properties) algorithm over a 3 year-period. The range-corrected signal (RCS) at 1064 nm measured with a ceilometer and the aerosol optical depth (AOD) and sky radiances from a sun/sky photometer have been used as input for this algorithm. We perform a detailed evaluation of GRASP retrievals with simultaneous in-situ measurements performed at the same height, at the Montsec mountaintop observatory (MSA) in the Pre-Pyrenees (northeastern Spain). This is the first long-term evaluation of various outputs of this algorithm; previous evaluations focused only on the study of aerosol volume concentration for short-term periods. In general, our results show good agreement between techniques although GRASP inversions yield higher values than those measured in-situ. The statistical analysis of the extinction coefficient vertical profiles shows a clear seasonality as well as significant differences depending on the air-masses origin. The observed seasonal cycle is mainly modulated by a higher development of the atmospheric boundary layer (ABL) during warm months, which favors the transport of pollutants to MSA, and higher influence of regional and North-African episodes. On the other hand, in winter, MSA is frequently influenced by free troposphere conditions and venting periods, and therefore lower extinction coefficients that markedly decrease with height. This study shows the potentiality of implementing GRASP in ceilometers and lidars networks for obtaining aerosol optical properties and volume concentrations at multiple sites worldwide, which will definitely contribute to enhance the representativeness of aerosol vertical distribution as well as to provide useful information for satellite and global models evaluation.

Gloria Titos et al.
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Gloria Titos et al.
Gloria Titos et al.
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Short summary
We present new results of vertically-resolved extensive aerosol optical properties (backscattering, scattering and extinction) and volume concentrations retrieved with the GRASP algorithm from ceilometer and photometer measurements. Long-term evaluation with in-situ data gathered at the Montsec mountaintop observatory (northeastern Spain) shows good agreement, being a step-forward towards a better representation of aerosol vertical distribution with wide spatial coverage.
We present new results of vertically-resolved extensive aerosol optical properties...
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