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Volume 16, issue 18 | Copyright

Special issue: The Saharan Aerosol Long-range Transport and Aerosol-Cloud-interaction...

Atmos. Chem. Phys., 16, 11535-11546, 2016
https://doi.org/10.5194/acp-16-11535-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 Sep 2016

Research article | 16 Sep 2016

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

Silke Groß1, Josef Gasteiger2, Volker Freudenthaler2, Thomas Müller4, Daniel Sauer1, Carlos Toledano3, and Albert Ansmann4 Silke Groß et al.
  • 1Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Münchner Str. 20, 82234 Oberpfaffenhofen, Germany
  • 2Ludwig-Maximilians-Universität, Meteorologisches Institut, Theresienstr. 37, 80333 München, Germany
  • 3Universitat de Valladolid, Valladolid, Spain
  • 4Leibniz-Institut für Troposphärenforschung (TROPOS), Permoserstr. 15, 04318 Leipzig, Germany

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 200m 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 532nm and find mean values of 0.04 (SD 0.03) and 0.05 (SD 0.04) at 355 and 532nm, respectively, for the particle linear depolarization ratio, and (26 ± 5) sr for the lidar ratio at 355 and 532nm. For the concentration of dust in the convective marine boundary layer we find that most values were between 20 and 50µgm−3. 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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Dual-wavelength depolarization sensitive Raman lidar measurements were used to characterize the optical properties of the dust loaded convective boundary layer over the Caribbean. Furthermore we derived the dust volume fraction and dust mass concentration within the convective boundary layer.
Dual-wavelength depolarization sensitive Raman lidar measurements were used to characterize the...
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