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© Imperial College LondonPage 1 Quantifying the direct radiative effect of Saharan dust aerosol over north-west Africa and the tropical Atlantic Richard.

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Presentation on theme: "© Imperial College LondonPage 1 Quantifying the direct radiative effect of Saharan dust aerosol over north-west Africa and the tropical Atlantic Richard."— Presentation transcript:

1 © Imperial College LondonPage 1 Quantifying the direct radiative effect of Saharan dust aerosol over north-west Africa and the tropical Atlantic Richard Bantges Space & Atmospheric Physics

2 © Imperial College LondonPage 2 Project Aims Spatial / temporal variability of dust Radiative impact on TOA SW & LW Impact at the surface – temporal & spatial variability Develop algorithms to retrieve SW & LW surface fluxes from satellite observations From retrievals – dust impact on SRB over African continent

3 © Imperial College LondonPage 3 Dust aerosol detection Case Study I: 0000 UTC, 3 rd March – 2300 UTC, 5 th March, 2004 Red: 12.0-10.8  m, Green: 10.8-8.7  m, Blue: 10.8  m Red: 1.6  m, Green: 0.8  m, Blue: 0.6  m

4 © Imperial College LondonPage 4 1155 UTC 04/03/04 1405 UTC 05/03/04 SEVIRI MODIS 1200 UTC 04/03/04 1400 UTC 05/03/04

5 © Imperial College LondonPage 5 Diurnal variation in AOD: 05/03/04

6 © Imperial College LondonPage 6 Impact on broad-band TOA reflected SW radiance/flux 05/03/04

7 © Imperial College LondonPage 7 Net surface radiation from satellite observations LOwland CAtchment Research (LOCAR) Estimates of grid/catchment area average evaporation Network of ground stations Satellite data (AVHRR, MODIS, SEVIRI) Scaling: Point → Field → Catchment

8 © Imperial College LondonPage 8

9 © Imperial College LondonPage 9

10 © Imperial College LondonPage 10

11 © Imperial College LondonPage 11 Benefits Temporal & spatial patterns of dust aerosol over African continent Enhanced SRB components in the presence of dust aerosol → hydrological balance Addition information to use in assessing impacts of climate change on water supply, crops, animal and human conditions

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