Airborne measurements of dust layer properties, particle size distribution and mixing state of Saharan dust during SAMUM 2006

Bernadett Weinzierl; Andreas Petzold; Michael Esselborn; Martin Wirth; Katharina Rasp; Konrad Kandler; Lothar Schütz; Peter Koepke; Markus Fiebig

doi:10.1111/j.1600-0889.2008.00392.x

Airborne measurements of dust layer properties, particle size distribution and mixing state of Saharan dust during SAMUM 2006

Tellus B: Chemical and Physical Meteorology

Volume 61 (2009): Issue 1

By: Bernadett Weinzierl, Andreas Petzold, Michael Esselborn, Martin Wirth, Katharina Rasp, Konrad Kandler, Lothar Schütz, Peter Koepke and Markus Fiebig

Open Access

|Jan 2009

Abstract

The Saharan Mineral Dust Experiment (SAMUM) was conducted in May/June 2006 in southern Morocco. As part of SAMUM, airborne in situ measurements of the particle size distribution in the diameter range 4 nm < D_p < 100 μm were conducted. The aerosol mixing state was determined below D _p < 2.5 μm. Furthermore, the vertical structure of the dust layers was investigated with a nadir-looking high spectral resolution lidar (HSRL). The desert dust aerosol exhibited two size regimes of different mixing states: below 0.5 μm, the particles had a non-volatile core and a volatile coating; larger particles above 0.5 μm consisted of non-volatile components and contained light absorbing material. In all cases, particles larger than 10 μm were present, and in 80% of the measurements no particles larger than 40 μm were present. The abundance of large particles showed almost no height dependence. The effective diameter D _eff in the dust plumes investigated showed two main ranges: the first range of D _eff peaked around 5 μm and the second range of D _eff around 8 μm. The two ranges of D _eff suggest that it may be inadequate to use one average effective diameter or one parametrization for a typical dust size distribution.

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DOI: https://doi.org/10.1111/j.1600-0889.2008.00392.x | Journal eISSN: 1600-0889

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Language: English

Page range: 96 - 117

Submitted on: Jan 2, 2008

Accepted on: Aug 14, 2008

Published on: Jan 1, 2009

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 2009 Bernadett Weinzierl, Andreas Petzold, Michael Esselborn, Martin Wirth, Katharina Rasp, Konrad Kandler, Lothar Schütz, Peter Koepke, Markus Fiebig, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 61 (2009): Issue 1