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Preprints
https://doi.org/10.5194/acp-2020-977
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-977
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Nov 2020

06 Nov 2020

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This preprint is currently under review for the journal ACP.

Measurement report: Balloon-borne in-situ profiling of Saharan dust over Cyprus with the UCASS optical particle counter

Maria Kezoudi1,a, Matthias Tesche1,b, Helen Smith1,c, Alexandra Tsekeri2, Holger Baars3, Maximilian Dollner4, Víctor Estellés5,6, Bernadett Weinzierl4, Zbigniew Ulanowski1,7,8, Detlef Müller1, and Vassilis Amiridis2 Maria Kezoudi et al.
  • 1University of Hertfordshire, Hatfield, United Kingdom
  • 2National Observatory of Athens, Athens, Greece
  • 3Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 4Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Vienna, Austria
  • 5University of Valencia, Valencia, Spain
  • 6ISAC-CNR, Rome, Italy
  • 7School of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom
  • 8British Antarctic Survey, NERC, Cambridge, United Kingdom
  • anow at: The Cyprus Institute, Nicosia, Cyprus
  • bnow at: Leipzig University, Leipzig, Germany
  • cnow at: TruLife Optics Ltd, London, United Kingdom

Abstract. This paper presents measurements of mineral dust concentration in the diameter range from 0.4 to 14.0 μm with a novel balloon-borne optical particle counter, the Universal Cloud and Aerosol Sounding System (UCASS). The balloon launches were coordinated with ground-based active and passive remote-sensing observations and airborne in-situ measurements with a research aircraft during a Saharan dust outbreak over Cyprus from 20 to 23 April 2017. The aerosol optical depth at 500 nm reached values up to 0.5 during that event over Cyprus and particle number concentrations were as high as 50 cm−3 for the diameter range between 0.8 and 13.9 μm. Comparisons of the total particle number concentration and the particle size distribution from two cases of balloon-borne measurements with aircraft observations show reasonable agreement in magnitude and shape despite slight mismatches in time and space. While column-integrated size distributions from balloon-borne measurements and ground-based remote sensing show similar coarse-mode peak concentrations and diameters, they illustrate the ambiguity related to the missing vertical information in passive sun photometer observations. Extinction coefficient inferred from the balloon-borne measurements agrees with those derived from coinciding Raman lidar observations at height levels with particle number concentrations smaller than 10 cm−3 for the diameter range from 0.8 to 13.9 μm. An overestimation of the extinction coefficient of a factor of two was found for layers with particle number concentrations that exceed 25 cm−3. This is likely the result of a variation in the refractive index, the shape- and size-dependency of the extinction efficiency of dust particles along the UCASS measurements.

Maria Kezoudi et al.

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