Authors: FREUDENTHALER, VOLKER; ESSELBORN, MICHAEL¹; WIEGNER, MATTHIAS²; HEESE, BIRGIT³; TESCHE, MATTHIAS³; ANSMANN, ALBERT³; MÜLLER, DETLEF³; ALTHAUSEN, DIETRICH³; WIRTH, MARTIN¹; FIX, ANDREAS¹; EHRET, GERHARD¹; KNIPPERTZ, PETER⁴; TOLEDANO, CARLOS²; GASTEIGER, JOSEF²; GARHAMMER, MARKUS²; SEEFELDNER, MEINHARD²

Source: Tellus B, Volume 61, Number 1, February 2009 , pp. 165-179(15)

Publisher: Wiley-Blackwell

Abstract:

Vertical profiles of the linear particle depolarization ratio of pure dust clouds were measured during the Saharan Mineral Dust Experiment (SAMUM) at Ouarzazate, Morocco (30.9°N, -6.9°E), close to source regions in May-June 2006, with four lidar systems at four wavelengths (355, 532, 710 and 1064 nm). The intercomparison of the lidar systems is accompanied by a discussion of the different calibration methods, including a new, advanced method, and a detailed error analysis. Over the whole SAMUM periode pure dust layers show a mean linear particle depolarization ratio at 532 nm of 0.31, in the range between 0.27 and 0.35, with a mean Ångström exponent (AE, 440-870 nm) of 0.18 (range 0.04-0.34) and still high mean linear particle depolarization ratio between 0.21 and 0.25 during periods with aerosol optical thickness less than 0.1, with a mean AE of 0.76 (range 0.65-1.00), which represents a negative correlation of the linear particle depolarization ratio with the AE. A slight decrease of the linear particle depolarization ratio with wavelength was found between 532 and 1064 nm from 0.31 ± 0.03 to 0.27 ± 0.04.

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1600-0889.2008.00396.x

Affiliations: 1: Institute of Atmospheric Physics, German Aerospace Center (DLR), Oberpfaffenhofen, 82234 Wessling, Germany 2: Meteorological Institute, Ludwig-Maximilians-Universität, Theresienstr. 37, 80333 Munich, Germany 3: Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany 4: Institute for Atmospheric Physics, Johannes Gutenberg University, Becherweg 21, 55099 Mainz, Germany

Publication date: 2009-02-01

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• In this Subject: Geology ,  Meteorology & Climatology
• By this author: FREUDENTHALER, VOLKER ;  ESSELBORN, MICHAEL ;  WIEGNER, MATTHIAS ;  HEESE, BIRGIT ;  TESCHE, MATTHIAS ;  ANSMANN, ALBERT ;  MÜLLER, DETLEF ;  ALTHAUSEN, DIETRICH ;  WIRTH, MARTIN ;  FIX, ANDREAS ;  EHRET, GERHARD ;  KNIPPERTZ, PETER ;  TOLEDANO, CARLOS ;  GASTEIGER, JOSEF ;  GARHAMMER, MARKUS ;  SEEFELDNER, MEINHARD

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