Volcanic Smog and Sunglint in the Vanuatu Archipelago
The Vanuatu Archipelago is a collection of volcanic islands about 1,800
kilometers (1,100 miles) northeast of Australia. Two of the islands, Gaua and
Ambrym, frequently vent sulfurous gases.
On Jan. 7, 2014 NASA's Aqua satellite passed over Vanuatu, allowing the
Moderate Resolution Imaging Spectroradiometer (MODIS) aboard to capture this
true-color image. A broad plume of volcanic vog and ash rises from Ambrym and
spreads across the South Pacific. Vog is a combination of “volcanic” and “smog”,
and is formed when gases from a volcano react with sunlight, oxygen and
moisture.
The vog appears as a light blue-gray plume which arcs from the volcanic
island both to the northwest and to the northeast. In the northeast, the vog
crosses a mirror-like swath of silver-gray which runs from north to south. That
swath is not volcanic in origin, but is an artifact called “sunglint” – the
reflection of the sun off the ocean in a satellite image.
Image Credit: NASA/Jeff Schmaltz/MODIS Rapid Response
Team
Guillermo Gonzalo Sánchez Achutegui
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