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Preprints
https://doi.org/10.5194/acp-2020-133
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-133
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Mar 2020

Submitted as: research article | 13 Mar 2020

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

Optical and geometrical aerosol particle properties over the United Arab Emirates

Maria Filioglou1, Elina Giannakaki1,2, John Backman3, Jutta Kesti3, Anne Hirsikko3, Ronny Engelmann4, Ewan O'Connor3, Jari T. T. Leskinen5, Xiaoxia Shang1, Hannele Korhonen3, Heikki Lihavainen3,6, Sami Romakkaniemi1, and Mika Komppula1 Maria Filioglou et al.
  • 1Finnish Meteorological Institute, Kuopio, FI70211, Finland
  • 2Environmental Physics and Meteorology, Faculty of Physics, National and Kapodistrian University of Athens, Athens, GR 15784, Greece
  • 3Finnish Meteorological Institute, Helsinki, FI00560, Finland
  • 4Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, DE04318, Germany
  • 5University of Eastern Finland, Kuopio, FI70211, Finland
  • 6Svalbard Integrated Arctic Earth Observing System, Longyearbyen, N-9170, Norway

Abstract. One-year of ground-based night-time Raman lidar observations have been analysed under the Optimization of Aerosol Seeding In rain enhancement Strategies (OASIS) project, in order to characterize the aerosol particle properties over a rural site in the United Arab Emirates. In total, 1130 aerosol particle layers were detected during the one-year measurement campaign which took place between March 2018 and February 2019. Several subsequent aerosol layers could be observed simultaneously in the atmosphere up to 11 km. The observations indicate that the measurement site is a receptor of frequent dust events but predominantly the dust is mixed with aerosols of anthropogenic and/or marine origin. The mean aerosol optical depth over the measurement site ranged at 0.37 ± 0.12 and 0.21 ± 0.11 for the 355 and 532 nm, respectively. Moreover, a mean lidar ratio of 43 ± 11 sr at a wavelength of 355 nm and 39 ± 10 sr at 532 nm was found. The average linear particle depolarization ratio measured over the course of the campaign was 15 ± 6 % and 19 ± 7 % at 355 nm and 532 nm wavelengths, respectively. Since the region is both a source and a receptor of mineral dust, we have also explored the properties of Arabian mineral dust of the greater area of United Arab of Emirates and the Arabian Peninsula. The observed Arabian dust particle properties were 45 ± 5 (42 ± 5) sr at 355 (532) nm for the lidar ratio, 25 ± 2 % (31 ± 2 %) for the linear particle depolarization ratio at 355 (532) nm, and 0.3 ± 0.2 (0.2 ± 0.2) for the extinction‑related Ångström exponent (backscatter‑related Ångström exponent) between 355 and 532 nm. This study is the first to report comprehensive optical properties of the Arabian dust particles based on long term observations, using at the fullest the capabilities of a multi wavelength Raman lidar instrument. The results suggest that the mineral dust properties over the Middle East and western Asia, including the observation site, are comparable to those of African mineral dust with regard to the particle depolarization ratios but not for lidar ratios. The smaller lidar ratio values in this study compared to the reference studies are attributed to the difference in the geochemical characteristics of the soil originating in the study region compared to Northern Africa.

Maria Filioglou et al.

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Maria Filioglou et al.

Maria Filioglou et al.

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