27.01.2014 : FB1-Seminar

14:30 h, Gr. Konferenzraum, Düsternbrooker Weg 20

Abstract: 

Bernadett Weinzierl and the SALTRACE Team

Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen & Ludwig-Maximilians-Universität (LMU), Meteorologisches Institut, München

The Saharan Aerosol Long-range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE: http://www.pa.op.dlr.de/saltrace) was conducted in June/July 2013 to investigate the transport and transformation of mineral dust during long-range transport from the Sahara across the Atlantic Ocean into the Caribbean. SALTRACE is a German initiative combining ground-based and airborne in-situ and lidar measurements with meteorological data, long-term measurements, satellite remote sensing and modeling which involved many national and international partners.

During SALTRACE, the DLR Falcon research aircraft was equipped with an extended set of in-situ instruments for the measurement of microphysical and optical aerosol properties, with sampling devices for offline particle analysis, with a nadir-looking 2-µm wind lidar, with dropsondes and instruments for standard meteorological parameters. Ground-based lidar and in-situ instruments were deployed in Cape Verde, Barbados and Puerto Rico.

Mineral dust from five dust outbreaks was studied by the DLR Falcon research aircraft between Senegal, Cape Verde Islands, the Caribbean, and Florida under different atmospheric conditions during SALTRACE. Highlights during SALTRACE included the Lagrangian sampling of a dust plume in the Cape Verde area on 17 June which was again measured with the same instrumentation on 21 and 22 June 2013 near Barbados. The event was also captured by the ground-based lidar and in-situ instrumentation. Another highlight was the formation of tropical storm Chantal in the dusty environment.

In this presentation, we give an overview of the SALTRACE study and show early results covering profiles of dust size distributions, cloud condensation number concentration, and dust optical properties. In particular, we discuss the results from the trans-Atlantic Lagrangian dust study and show similarities and differences of the dust plumes observed close to the Sahara and in the Caribbean.

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