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Discussion papers
https://doi.org/10.5194/acp-2019-419
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-419
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Jun 2019

Research article | 06 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Sun photometer retrievals of Saharan dust properties over Barbados during SALTRACE

Carlos Toledano1, Benjamín Torres2, Cristian Velasco-Merino1, Dietrich Althausen3, Silke Groß4, Matthias Wiegner5, Bernadett Weinzierl6, Josef Gasteiger6, Albert Ansmann3, Ramiro González1, David Mateos1, David Farrel7, Thomas Müller3, Moritz Haarig3, and Victoria E. Cachorro1 Carlos Toledano et al.
  • 1Group of Atmospheric Optics, University of Valladolid, Valladolid, Spain
  • 2Laboratory of Atmospheric Optics, University of Lille, Villeneuve d'Ascq, France
  • 3Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 4German Aerospace Center, Institute of Atmospheric Physics, Oberpfaffenhofen, Germany
  • 5Meteorological Institute, Ludwig Maximilians University, Munich, Germany
  • 6Aerosol Physics and Environmental Physics, University of Vienna, Vienna, Austria
  • 7Caribbean Institute for Meteorology and Hydrology, Bridgetown, Barbados

Abstract. The Saharan Aerosol Long-range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE) was devoted to the investigation of Saharan dust properties over the Caribbean. The campaign took place in June–July 2013. A wide set of ground-based and airborne aerosol instrumentation was deployed at Barbados island for a comprehensive experiment. Several sun photometers performed measurements during this campaign: two AERONET Cimel sun photometers and the Sun and Sky Automatic Radiometer (SSARA). The sun photometers were co-located with the ground-based multi-wavelength lidars BERTHA and POLIS. Aerosol properties derived from direct sun and sky radiance observations are analyzed, and a comparison with the co-located lidar and in-situ data is provided. The time series of aerosol optical depth allows identifying successive dust events with short periods in between in which the marine background conditions were observed. Moderate aerosol optical depth in the range 0.3 to 0.6 was found during the dust periods. The sun photometer infrared channel at 1640 nm wavelength was used in the retrieval to investigate possible improvements and expected larger sensitivity to coarse particles. The comparison between column (AOD) and surface (dust concentration) data demonstrates the connection between the Saharan Air Layer and the boundary layer in the Caribbean region, as it is shown by the synchronized detection of the successive dust events in both data sets. However the comparison of size distributions derived from sun photometer data and in-situ observations reveal the difficulties to carry out a column closure study.

Carlos Toledano et al.
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Short summary
Ground-based sun photometers have been used to analyze the properties of long-range transported Saharan dust over Barbados. The measurements were carried out as part of the Saharan Aerosol Long-range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE), carried out in the Caribbean in 2013. A variety of instruments, ground-based and airborne, were used in this research. In this paper, the sun photometer data are presented and related to data collected from other co-located instruments.
Ground-based sun photometers have been used to analyze the properties of long-range transported...
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