African Dust Event July 15 – July 27, 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 July 15 – July 27, 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 July 15 through July 27, 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.

Dust cloud emerging from African Coast July 15, UTC Clean air

July 16, UTC Clean air Dust cloud moving over Cape Verde Islands

July 17, UTC Dust cloud moving across Atlantic Ocean Clean air

July 18, UTC Clean air Dust cloud moving across Atlantic Ocean

July 19, UTC Dust cloud approaching Lesser Antilles Clean air

July 19, UTC Dust cloud approaching Lesser Antilles Clean air

July 20, UTC Dust cloud moving across Lesser Antilles Clean air

July 21, UTC Dust cloud moving through eastern Caribbean Sea Clean air

July 22, UTC Dust cloud moving through Caribbean Sea Clean air

July 22, UTC Saharan dust Danny Clean air

July 23, UTC Danny Clean air Saharan dust

July 24, UTC Saharan dust Clean air

July 25, UTC Saharan dust Clean air

July 26, UTC Saharan dust Clean air

July 27, UTC Saharan dust Clean air

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