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

        Author
        Gross, Silke
        Gasteiger, Josef
        Freudenthaler, Volker
        Wiegner, Matthias
        Geiss, Alexander
        Schladitz, Alexander
        Toledano, Carlos
        Kandler, Konrad
        Tesche, Matthias
        Ansmann, Albert
        Wiedensohler, Alfred
        Attention
        2299/16249
        Abstract
        Measurements with two Raman-depolarization lidars of the Meteorological Institute of the Ludwig-Maximilians-Universität, München, 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.
        Publication date
        2011-09-01
        Published in
        Tellus Series B-Chemical and Physical Meteorology
        Published version
        https://doi.org/10.1111/j.1600-0889.2011.00557.x
        Other links
        http://hdl.handle.net/2299/16249
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