These images from the Multi-angle Imaging SpectroRadiometer (MISR) illustrate
the abundance of smoke over the northeastern United States from fires burning
in Qu‚bec on July 6, 2002. The images at left and center are natural color
views acquired by MISR's vertical-viewing (nadir), and 70-degree
forward-viewing cameras, respectively. Although smoke is visible in the nadir
image, the oblique view angle greatly enhances the appearance of smoke.
The abundance of atmospheric particulates (aerosols) can be derived from the
variation of scene brightness and contrast as a function of observation angle,
and is displayed by the map of aerosol optical depth on the right. Using the
current automated algorithms, reliable retrievals are not feasible for land
areas covered by aerosols which totally obscure the underlying
surface. In these areas, no retrievals were obtained (shown in dark
gray) or a sporadic false result was returned (shown in red). Areas
where clouds were successfully screened are also shown in dark gray.
Elevated aerosol amounts (shown in blue-green and green) are visible
over New York City and the Atlantic Ocean.
The Multi-angle Imaging SpectroRadiometer views almost the entire Earth every 9
days. These images were acquired during Terra orbit 13562 and cover an area of
about 380 kilometers x 916 kilometers.
A number of large, intense wildfires burning in eastern Canada sent a large plume of smoke southward along U.S. east coast in early July. This latest image from the MISR instrument reveals just how thick that smoke plume was.