African Dust Event June 18 – July 3 2008 Daily Satellite Images Prepared by Bryan Lambeth, P.E. Texas Commission on Environmental Quality Monitoring Operations.

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Presentation transcript:

African Dust Event June 18 – July Daily Satellite Images Prepared by Bryan Lambeth, P.E. Texas Commission on Environmental Quality Monitoring Operations Division September 2009

African Dust The following satellite images track dust originating from the Saharan Desert in northern Africa as it travels across the Atlantic Ocean, Caribbean Sea, and Gulf of Mexico from June 18 through July 3, Normally the ocean surface appears very dark when skies are clear and the air is clean. Clouds are usually a bright white. Haze from dust can be detected in cloud-free areas over water by a brightening of the normally dark surface. The brightness corresponds to the intensity of the haze, with greater brightness indicating a higher concentration of dust. Haze boundaries are usually not sharp with a gradual decrease in intensity near the edge of the dust cloud, unlike clouds, which usually have sharp boundaries. Higher clouds also cast tell-tale shadows in late daytime images.

June 18, UTC Dust cloud emerging from African Coast

June 19, UTC Clean air

Dust cloud moving over Cape Verde Islands June 20, UTC Clean air

June 21, UTC Dust cloud moving across Atlantic Ocean Clean air

June 22, UTC Dust cloud moving across Atlantic Ocean Clean air

June 23, UTC Dust cloud approaching Lesser Antilles Clean air

June 23, UTC Dust cloud moving into Lesser Antilles Clean air

June 24, UTC Dust cloud moving into Greater Antilles Clean air

June 25, UTC Dust cloud moving across Greater Antilles Clean air

June 26, UTC Dust cloud moving across Bahamas, Cuba, Northwest Caribbean Sea Clean air

June 26, UTC Dust cloud entering Southeast Gulf of Mexico Clean air

Dust cloud moving across Southeast Gulf of Mexico June 27, UTC

June 28, UTC Saharan dust covers most of Gulf of Mexico More Saharan dust

June 29, UTC Saharan dust

June 30, UTC Saharan dust

July 1, UTC Saharan dust

July 2, UTC Saharan dust

July 3, UTC Saharan dust