Dust radiative feedback on Saharan boundary layer dynamics and dust mobilization

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 Bode le 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 Bodele. However, such processes are likely also relevant for other Saharan regions. Citation: Heinold, B., I. Tegen, K. Schepanski, and O. Hellmuth (2008), Dust radiative feedback on Saharan boundary layer dynamics and dust mobilization, Geophys. Res. Lett., 35, L20817, doi:10.1029/2008GL035319.