Atmospheric Controls on North African Dust Emission Richard Washington Sebastian Engelstaedter Martin Todd, Gil Lizcano Fiona Mitchell Yoram Kaufman, Ilan.

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Presentation transcript:

Atmospheric Controls on North African Dust Emission Richard Washington Sebastian Engelstaedter Martin Todd, Gil Lizcano Fiona Mitchell Yoram Kaufman, Ilan Koren Oxford, UCL, GSFC NASA,

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC Annual dust cycle of TOMS AI ( )

Washington and Todd 2005 GRL Mean JFM Zonal Wind: latitude-height along 18 E

Washington and Todd 2005 GRL Bodele daily dust Vs 1000 hPa geopotentials and 950 vector winds (JFM)

Tibesti Ennedi Gap Flow Bodele LLJ Palaeo Lake

Phase of TOMS AI

Dust in Colour Rainfall black contours

Annual Cycle of TOMS AI Vs Annual Cycle of ERA-40 Surface Wind

Annual Cycle of TOMS AI Vs Annual Cycle of ERA-40 Surface Divergence

Mean TOMS AI for main dust season May-Aug ( ) WA1 WA2 WA3 WA4 BOD EA

WA1WA2WA3WA4BODEA Mean TOMS AI for dust season May-Aug ( ) Engelstaedter and Washington in prep

Annual Cycle of TOMS AI Vs Annual Cycle of ERA-40 surface gustiness

Eastern Sahara (Chad): Mean wind controls aerosol production Western Sahara (Mali/Mauri heat low): surface convergence and wind gustiness fits annual cycle better

Parcel trajectory density climatology July ( ) Djouf region ( N, W) % trajectories remain over Sahara (> 15N < 30N) % trajectories crossing the 15W meridian After days