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From: Dan Richter (1:317/3)
To: All
Date: Tue, 20.10.20 13:00
MODIS Pic of the Day 20 October 2020
October 20, 2020 - Sediment in the northern Persian Gulf


Tigris-Euphrates River Basin

On October 19, 2020, the Moderate Resolution Imaging Spectroradiometer
(MODIS) on board NASA’s Aqua satellite acquired a true-color image of
sediment flowing into the northern Persian Gulf. As sediment pours into
the Gulf, it lays near the surface of the water and appears muddy tan.
As the sediment sinks, the reflectivity changes and it then appears
green or turquoise when seen from space.

Much of the sediment clouding the blue waters of the Gulf comes from
the Shatt al-Arab River, which is visible as a muddy curving line along
the border between Iran (east) and Iraq (west). The Shatt al-Arab is
formed by the confluence of the Euphrates and Tigris Rivers of Iraq and
the Karun River of Iran. It is the main source of freshwater to the
northern Persian Gulf and, along with the associated marshes (seen as
dark green areas) provide nutrients, sediment, and pollutants, making
the river profoundly important to the northern Gulf ecosystem.

Image Facts
Satellite: Aqua
Date Acquired: 10/19/2020
Resolutions: 1km (33.1 KB), 500m (115.3 KB), 250m (355.1
Bands Used: 1,4,3
Image Credit: MODIS Land Rapid Response Team, NASA GSFC

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