Real, three-dimensional shape of a dust particle is derived from a pair of scanning-electron microscope images by means of stereophotogrammetry. The resulting shape is discretized, and preliminary discrete-dipole-approximation computations for the single dust particle reveal that scattering by such an irregular shape differs notably from scattering by a sphere or a Gaussian random sphere which ...

Alignment of atmospheric mineral dust due to electric field Z. Ulanowski, J. Bailey, P. W. Lucas, J. H. Hough, and E. Hirst Science and Technology Research Institute, Univ. of Hertfordshire, Hatfield AL10 9AB, UK Australian Centre for Astrobiology, Macquarie University, Sydney NSW 2109, Australia Received: 9 July 2007 – Accepted: 3 September 2007 – Published: 10 September 2007 Correspondence to...

Efficiency of the deposition mode ice nucleation on mineral dust particles O. Möhler, P. R. Field, P. Connolly, S. Benz, H. Saathoff, M. Schnaiter, R. Wagner, R. Cotton, M. Krämer, A. Mangold, and A. J. Heymsfield Forschungszentrum Karlsruhe, Institute for Meteorology and Climate Research (IMK-AAF), Germany Met Office, OBR (Observations Based Research), UK University of Manchester, School of Ea...

Mineral dust deposition is suggested to be a significant atmospheric supply pathway of bioavailable iron (Fe) to Fe-depleted surface oceans. In this study, mineral dust and dissolved Fe (Fed) deposition rates are predicted for March 2009 to February 2010 using the 3-D chemical transport model GEOS-Chem implemented with a comprehensive dust-Fe dissolution scheme. The model simulates Fed producti...

[1] The processes that determine which areas are strong sources of mineral aerosols are not well known. In this study we consider the role of ephemeral lakes in modulating emissions of atmospheric mineral aerosols. We focus on two ephemeral lake regions that have been identified as source regions: the zone of Chotts in Tunisia and Algeria, and Etosha Pan in Namibia. Comparisons of satellite ret...

Interactive comment on “Study of Arabian Red Sea coastal soils as potential mineral dust sources” by P. Jish Prakash et al. Anonymous Referee #1 Received and published: 25 April 2016 The study presents results from measurements of the mineral composition and other properties of soil, based on 13 samples at four locations in the Saudi Arabian coastal plane adjacent to the Red Sea. The region has...

Mineral dust aerosols emitted from the Earth crust during various natural and anthropogenic processes continuously alter the chemical balance of the atmosphere via heterogeneous processes and thus, impact on the global climate. Understanding of heterogeneous chemistry and photochemistry on mineral dust has become vital to accurately predict the effect of mineral dust loading on the Earth’s atmo...

Much uncertainty in the value of the imaginary part of the refractive index of mineral dust contributes to uncertainty in the radiative effect of mineral dust in the atmosphere. A synthesis of optical, chemical and physical in-situ aircraft measurements from the DODO experiments during February and August 2006 are used to calculate the refractive index mineral dust encountered over West Africa....

The ability of coated mineral dust particles to act as ice nuclei (IN) was investigated at LACIS (Leipzig Aerosol Cloud Interaction Simulator) during the FROST1and FROST2-campaigns (Freezing of dust). Sulphuric acid was condensed on the particles which afterwards were optionally humidified, treated with ammonia vapour and/or heat. By means of aerosol mass spectrometry we found evidence that pro...

1) Using MODIS Terra Level 1B data containing calibrated and geolocated radiances, we investigated a regional signal of wind-blown mineral dust over the oceans. The goal of this study was to identify the thermal-IR radiative signature of atmospheric dust originating from the main world’s dust production regions and explore the implications to the dust detection over oceans with the techniques b...