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Original Research Papers

Characterization of the planetary boundary layer during SAMUM-2 by means of lidar measurements

Authors:

Silke Groß ,

Meteorological Institute, Ludwig–Maximilians–Universität, DE
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Josef Gasteiger,

Meteorological Institute, Ludwig–Maximilians–Universität, DE
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Volker Freudenthaler,

Meteorological Institute, Ludwig–Maximilians–Universität, DE
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Matthias Wiegner,

Meteorological Institute, Ludwig–Maximilians–Universität, DE
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Alexander Geiß,

Meteorological Institute, Ludwig–Maximilians–Universität, DE
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Alexander Schladitz,

Leibniz Institute for Tropospheric Research, DE
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Carlos Toledano,

Meteorological Institute, Ludwig–Maximilians–Universität, DE
About Carlos
Now at: Group of Atmospheric Optics, Valladolid University, Spain.
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Konrad Kandler,

Institute for Applied Geosciences, Technical University Darmstadt, DE
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Matthias Tesche,

Leibniz Institute for Tropospheric Research, DE
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Albert Ansmann,

Leibniz Institute for Tropospheric Research, DE
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Alfred Wiedensohler

Leibniz Institute for Tropospheric Research, DE
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Abstract

Measurements with two Raman-depolarization lidars of the Meteorological Institute of the Ludwig-Maximilians- Universit¨at, M¨unchen, Germany, performed during SAMUM-2, were used to characterize the planetary boundary layer (PBL) over Praia, Cape Verde. A novel approach was used to determine the volume fraction of dust υd in the PBL. This approach primarily relies on accurate measurements of the linear depolarization ratio. Comparisons with independent in situ measurements showed the reliability of this approach. Based on our retrievals, two different phases could be distinguished within the measurement period of almost one month. The first (22–31 January 2008) was characterized by high aerosol optical depth (AOD) in the PBL and large υd > 95%. During the second phase, the AOD in the PBL was considerably lower and υd less than ∼40%. These findings were in very good agreement with ground based in situ measurements, when ambient volume fractions are considered that were calculated from the actual measurements of the dry volume fraction. Only in cases when dust was not the dominating aerosol component (second phase), effects due to hygroscopic growth became important.

How to Cite: Groß, S., Gasteiger, J., Freudenthaler, V., Wiegner, M., Geiß, A., Schladitz, A., Toledano, C., Kandler, K., Tesche, M., Ansmann, A. and Wiedensohler, A., 2011. Characterization of the planetary boundary layer during SAMUM-2 by means of lidar measurements. Tellus B: Chemical and Physical Meteorology, 63(4), pp.695–705. DOI: http://doi.org/10.1111/j.1600-0889.2011.00557.x
  Published on 01 Jan 2011
 Accepted on 23 May 2011            Submitted on 11 Nov 2010

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