Depolarization ratio profiling at several wavelengths in pure Saharan dust during SAMUM 2006

Volker Freudenthaler, Michael Esselborn, Matthias Wiegner, Birgit Heese, Matthias Tesche, Albert Ansmann, D. Mueller, Dietrich Althausen, Martin Wirth, Andreas Fix, Gerhard Ehret, Peter Knippertz, Carlos Toledano, Josef Gasteiger, Markus Garhammer, Andmeinhard Seefeldner

Research output: Contribution to journalArticlepeer-review

336 Citations (Scopus)
87 Downloads (Pure)

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 degrees N, -6.9 degrees 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 angstrom ngstrom 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.

Original languageEnglish
Pages (from-to)165-179
Number of pages15
JournalTellus Series B-Chemical and Physical Meteorology
Volume61
Issue number1
DOIs
Publication statusPublished - Feb 2009

Keywords

  • AEROSOLS
  • CONTRAILS
  • LINEAR DEPOLARIZATION
  • BACKSCATTER
  • RAMAN LIDAR
  • EXTINCTION
  • PARAMETERS
  • CLOUDS
  • POLARIZATION LIDAR
  • RETURNS

Fingerprint

Dive into the research topics of 'Depolarization ratio profiling at several wavelengths in pure Saharan dust during SAMUM 2006'. Together they form a unique fingerprint.

Cite this