atmospheric controls on north african dust emission richard washington sebastian engelstaedter...
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![Page 1: Atmospheric Controls on North African Dust Emission Richard Washington Sebastian Engelstaedter Martin Todd, Gil Lizcano Fiona Mitchell Yoram Kaufman, Ilan](https://reader030.vdocument.in/reader030/viewer/2022032800/56649d365503460f94a0db41/html5/thumbnails/1.jpg)
Atmospheric Controls on North African Dust Emission
Richard Washington
Sebastian EngelstaedterMartin Todd, Gil Lizcano
Fiona MitchellYoram Kaufman, Ilan Koren
Oxford, UCL, GSFC NASA,
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JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
Annual dust cycle of TOMS AI (1980-92)
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Washington and Todd 2005 GRL
Mean JFM Zonal Wind: latitude-height along 18 E
![Page 4: Atmospheric Controls on North African Dust Emission Richard Washington Sebastian Engelstaedter Martin Todd, Gil Lizcano Fiona Mitchell Yoram Kaufman, Ilan](https://reader030.vdocument.in/reader030/viewer/2022032800/56649d365503460f94a0db41/html5/thumbnails/4.jpg)
Washington and Todd 2005 GRL
Bodele daily dust Vs 1000 hPa geopotentials and 950 vector winds (JFM)
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Tibesti
EnnediGap FlowBodele LLJ
Palaeo Lake
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Phase of TOMS AI1980-1992
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Dust in Colour
Rainfall black contours
![Page 8: Atmospheric Controls on North African Dust Emission Richard Washington Sebastian Engelstaedter Martin Todd, Gil Lizcano Fiona Mitchell Yoram Kaufman, Ilan](https://reader030.vdocument.in/reader030/viewer/2022032800/56649d365503460f94a0db41/html5/thumbnails/8.jpg)
Annual Cycle of TOMS AIVs Annual Cycle of ERA-40Surface Wind
![Page 9: Atmospheric Controls on North African Dust Emission Richard Washington Sebastian Engelstaedter Martin Todd, Gil Lizcano Fiona Mitchell Yoram Kaufman, Ilan](https://reader030.vdocument.in/reader030/viewer/2022032800/56649d365503460f94a0db41/html5/thumbnails/9.jpg)
Annual Cycle of TOMS AIVs Annual Cycle of ERA-40
Surface Divergence
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Mean TOMS AI for main dust season May-Aug (1980-92)
WA1WA2
WA3
WA4
BOD EA
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WA1 WA2 WA3 WA4 BOD EA
Mean TOMS AI for dust season May-Aug (1980-92)
Engelstaedter and Washington in prep
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Annual Cycle of TOMS AIVs Annual Cycle of ERA-40
surface gustiness
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• Eastern Sahara (Chad): Mean wind controls aerosol production
• Western Sahara (Mali/Mauri heat low): surface convergence and wind gustiness fits annual cycle better
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Parcel trajectory density climatology
July (1979-98)
Djouf region (17.5-22.5N, 2.5-7.5W)
% trajectories remain over Sahara (> 15N < 30N) 69 33 6
% trajectories crossing the 15W meridian 33 66 83
After days 3 5 10
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