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Atmospheric Controls on North African Dust Emission

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,. JAN. FEB. MAR. APR. MAY. JUN. JUL. AUG. SEP. OCT. NOV. DEC.

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Atmospheric Controls on North African Dust Emission

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  1. 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,

  2. JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Annual dust cycle of TOMS AI (1980-92)

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

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

  5. Tibesti Ennedi Gap Flow Bodele LLJ Palaeo Lake

  6. Phase of TOMS AI 1980-1992

  7. Dust in ColourRainfall black contours

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

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

  10. WA3 WA2 WA1 WA4 EA BOD Mean TOMS AI for main dust season May-Aug (1980-92)

  11. WA1 WA2 WA3 WA4 BOD EA Mean TOMS AI for dust season May-Aug (1980-92) Engelstaedter and Washington in prep

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

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

  14. Parcel trajectory density climatology July (1979-98) Djouf region (17.5-22.5N, 2.5-7.5W) After days 3 5 10 % trajectories crossing the 15W meridian 33 66 83 % trajectories remain over Sahara (> 15N < 30N) 69 33 6

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