African Dust Event August xx – August 12, 2008 Daily Satellite Images Prepared by Bryan Lambeth, P.E. Texas Commission on Environmental Quality Monitoring.

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Presentation transcript:

African Dust Event August xx – August 12, 2008 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 August xx through August 12, 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.

August 1, UTC Clean air Dust cloud emerging from African Coast

August 2, UTC Clean air Dust cloud moving over Cape Verde Islands

August 3, UTC Dust cloud moving across Atlantic Ocean Clean air

August 4, UTC Clean air Dust cloud moving across Atlantic Ocean

August 5, UTC Clean air Dust cloud approaching Lesser Antilles

August 5, UTC Clean air Dust cloud approaching Lesser Antilles

August 6, UTC Dust cloud moving across Lesser Antilles Clean air

August 7, UTC Dust cloud moving through central Caribbean Sea Clean air

August 8, UTC Dust cloud moving through Caribbean Sea Clean air

August 8, UTC Clean air Saharan dust

August 9, UTC Clean air Saharan dust

August 10, UTC Saharan dust Clean air

August 11, UTC Saharan dust Clean air

August 12, UTC Saharan dust Clean air

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