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GEOPHYSICAL RESEARCH LETTERS,
VOL. 35,
L20817,
5 PP., 2008
doi:10.1029/2008GL035319
Dust radiative feedback on Saharan boundary layer dynamics and dust mobilization
Leibniz Institute for Tropospheric Research, Leipzig, Germany
Leibniz Institute for Tropospheric Research, Leipzig, Germany
Leibniz Institute for Tropospheric Research, Leipzig, Germany
Leibniz Institute of Marine Sciences, IFM-GEOMAR, Kiel, Germany
Leibniz Institute for Tropospheric Research, Leipzig, Germany
Mineral dust radiative effects and feedbacks upon Saharan boundary layer meteorology are estimated by means of regional dust simulations for a one-week period in May 2006. The regional dust model system LM-MUSCAT is used, which allows online interaction of the computed dust load with the solar and thermal radiation and consequently with the model dynamics. For the Bodélé depression, a mechanism is proposed that describes positive and negative dust radiative feedbacks on surface wind speeds and dust emission in dependence on atmospheric stratification, dust-induced stabilization, and baroclinity. These effects are attributed to the formation and breakdown of the low-level jet (LLJ), which is a common phenomenon in the Bodélé. However, such processes are likely also relevant for other Saharan regions.
Received 11 July 2008; accepted 16 September 2008; published 24 October 2008.
Citation: (2008), Dust radiative feedback on Saharan boundary layer dynamics and dust mobilization, Geophys. Res. Lett., 35, L20817, doi:10.1029/2008GL035319.
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