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      Saharan dust contribution to the Caribbean summertime boundary layer – a lidar study during SALTRACE

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          Abstract

          Dual-wavelength lidar measurements with the small lidar system POLIS of the Ludwig-Maximilians-Universität München were performed during the SALTRACE experiment at Barbados in June and July 2013. Based on high-accuracy measurements of the linear depolarization ratio down to about 200 m above ground level, the dust volume fraction and the dust mass concentration within the convective marine boundary layer can be derived. Additional information from radiosonde launches at the ground-based measurement site provide independent information on the convective marine boundary layer height and the meteorological situation within the convective marine boundary layer. We investigate the lidar-derived optical properties, the lidar ratio and the particle linear depolarization ratio at 355 and 532 nm and find mean values of 0.04 (SD 0.03) and 0.05 (SD 0.04) at 355 and 532 nm, respectively, for the particle linear depolarization ratio, and (26 ± 5) sr for the lidar ratio at 355 and 532 nm. For the concentration of dust in the convective marine boundary layer we find that most values were between 20 and 50 µg<mspace linebreak="nobreak" width="0.125em"/>m<sup>−3</sup>. On most days the dust contribution to total aerosol volume was about 30–40 %. Comparing the dust contribution to the column-integrated sun-photometer measurements we see a correlation between high dust contribution, high total aerosol optical depth and a low Angström exponent, and of low dust contribution with low total aerosol optical depth.

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          Author and article information

          Journal
          Atmospheric Chemistry and Physics
          Atmos. Chem. Phys.
          Copernicus GmbH
          1680-7324
          2016
          September 16 2016
          : 16
          : 18
          : 11535-11546
          Article
          10.5194/acp-16-11535-2016
          © 2016

          http://creativecommons.org/licenses/by/3.0/

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