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From: Dan Richter (1:317/3)
To: All
Date: Thu, 22.10.20 13:00
MODIS Pic of the Day 22 October 2020
October 22, 2020 - Dust Storm in Chad


Dust Storm in Chad

On October 21, 2020, the Moderate Resolution Imaging Spectroradiometer
(MODIS) on NASA’s Terra satellite acquired a true-color image of pale
plumes of dust pouring from the Bodele Depression and blowing to the

Located south of the Tibesti Mountains and east of the Ennedi
Mountains, the Bodele Depression is often raked by strong wind as air
masses moving to the southwest strike the mountain ranges and are
squeezed between them. Once aloft, the dust often continues traveling
across neighboring countries, and sometimes all the way across the
Atlantic to fertilize the Amazon Rainforest in South America.

Once serving as part of the floor for a much larger Lake Chad, the
Bodele Depression, located at the southern edge of the Sahara Desert.
The modern remnants of Lake Chad can be seen near the bottom of the
image. While the Bodele Depression provides the source of frequent dust
storms, Lake Chad remains the most significant water body in the Sahel
region of Chad, housing most of the population of the country. Both
were part of the former inland sea known as Mega-Chad. Sometime before
5000 B.C., Lake Mega-Chad was the largest of four paleolakes that
existed in the Sahara region during the African Humid Period. It is
estimated to have covered about 400,000 sq km (150,000 sq mi), roughly
the size of today’s Caspian Sea.

Image Facts
Satellite: Terra
Date Acquired: 10/21/2020
Resolutions: 1km (67.4 KB), 500m (234 KB), 250m (742.8 KB)
Bands Used: 1,4,3
Image Credit: MODIS Land Rapid Response Team, NASA GSFC

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