European Facility For Airborne Research

European Facility For Airborne Research Aug. 15, 2018, 11:41

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Description
Title Impact of atmospheric transport on the evolution of microphysical and optical properties of Saharan dust
Type Publication
Abstract:

Saharan dust affects the climate by altering the radiation balance and by depositing minerals to the Atlantic Ocean. Both are dependent on particle size. We present aircraft measurements comprising 42 profiles of size distribution (0.1–300 µm), representing freshly uplifted dust, regional aged dust, and dust in the Saharan Air Layer (SAL) over the Canary Islands. The mean effective diameter of dust in SAL profiles is 4.5 µm smaller than that in freshly uplifted dust, while the vertical structure changes from a low shallow layer (0–1.5 km) to a well-mixed deep Saharan dust layer (0–5 km). Size distributions show a loss of 60 to 90% of particles larger than 30 µm 12 h after uplift. The single scattering albedo (SSA) increases from 0.92 to 0.94 to 0.95 between fresh, aged, and SAL profiles: this is enough to alter heating rates by 26%. Some fresh dust close to the surface shows SSA as low as 0.85.

Available from http://onlinelibrary.wiley.com/doi/10.1002/grl.50482/abstract
Author
HIGHWOOD Eleanor
MARSHAM John
RYDER Claire
SODEMANN Harald
T. M. Lai
Reference
Journal Geophysical Research Letters
Volume 40
Pages 2433-2438
Year 2013
Times cited None
Institute country United Kingdom
Type of science
  • Aerosol chemistry and physics
  • Atmospheric dynamics (includes thermodynamics)
  • Radiation
Field of science
  • Troposphere
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Last update Aug. 18, 2017, 08:44
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