The mysterious long-range transport of giant mineral dust particles

van der Does, M., Knippertz, P., Zschenderlein, P., Harrison, G. ORCID: https://orcid.org/0000-0003-0693-347X and Stuut, J.-B. (2018) The mysterious long-range transport of giant mineral dust particles. Science Advances, 4 (12). eaau2768. ISSN 2375-2548 doi: 10.1126/sciadv.aau2768

Abstract/Summary

Giant mineral dust particles (>75 µm diameter) found far from their source have puzzled scientists for a long time. These wind-blown particles impact the atmosphere’s radiation balance, clouds and the ocean carbon cycle but are generally ignored in models. Here we report new observations of individual giant Saharan dust particles of up to 450 µm in diameter sampled in air over the Atlantic Ocean at 2,400 and 3,500 km from the west African coast. Past research points to fast horizontal transport, turbulence, uplift in convective systems and electrical levitation of particles as possible explanations for this fascinating phenomenon. We present a critical assessment of these mechanisms using order-of-magnitude estimates and backward trajectories. Results show that established concepts are merely able to explain our new observations. Therefore we propose several lines of research we deem promising to further advance our understanding and modelling.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/80426
Identification Number/DOI	10.1126/sciadv.aau2768
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	American Association for the Advancement of Science
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