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My Background:
PhD: Mechanisms of Peak Winds and PhD: Mechanisms of Peak Winds and Dust EmissionsDust Emissions
Sophie CowieSupervisors: Peter Knippertz, Kerstin Schepanski, Doug Parker
2004-20092007-2008 2009-2010
Funding: European Research Council (ERC), part of “Desert Storms” grant.
Mechanisms of Peak Winds and Dust Emissions
Motivation - Sahara largest source of dust into the atmosphere. - Mineral dust influences:Amazon rainforest fertilisation, global airquality, global radiation budget, the carbon cycle on land and in the ocean. - To fully utilise the complete surface observation archive alongside new satellitedata.
ObjectivesSeparate dust emission reports into mechanisms;
• Dust devils and convective plumes • Haboobs• Low Level Jets (LLJs)
Including a deduction of their relative importance
Engelstaedter et al, 2006
Convective Plume
Dust Devil
Koch&Renno, 2005
Mechanisms of Peak Winds and Dust Emissions
Low Level Jet(LLJ)mechanism for dustuplift
Haboobs: Density currents Produced by collapsingthunderstorms
Knippertz, 2008
SEVIRI satellite Imagery: Thermal IR RGB-composite, red: 12-10.8μm, green: 10.8-8.7μm, blue: 10.7 μm
Mali, Aug 2004Copyright AMMA/GUICHARD/KERGOAT
Mechanisms of Peak Winds and Dust Emissions
FENNEC
Mean June Temp, Khttp://www.ecmwf.int/products/forecasts/d/charts/monitoring/coverage/dcover/
FENNEC Supersites
Richard Washington, April 09
FENNEC field Campaign 2011
Will collect new observations from within the Central West Sahara (crucial for dust emissions)
Desperately need more surface data from within the Sahara to validate models and satellite products.
Current surface observation network