Perilous
Times and Climate Change
The Scorched Earth � Ten Years of Global Wild Fire
Observations
By Mark Dunphy - Mon Oct 31, 4:01 pm
Wildfires across the USA in 2011 have burned over 3.5 million
acres in Texas and over 1 million acres in New Mexico. However,
these scars on the surface represent only a fraction of the total
land area scorched by fire during the last decade.
NASA has released a series of new satellite data visualizations
that show tens of millions of fires detected worldwide from space
since 2002. The visualizations show fire observations made by the
MODerate Resolution Imaging Spectroradiometer, or MODIS,
instruments onboard NASA�s Terra and Aqua satellites.
�What you see here is a very good representation of the satellite
data scientists use to understand the global distribution of fires
and to determine where and how fire distribution is responding to
climate change and population growth,� said Chris Justice of the
University of Maryland, College Park, a scientist who leads NASA�s
effort to use MODIS data to study the world�s fires.
One of the new visualizations takes viewers on a narrated global
tour of fires detected between July 2002 and July 2011. The fire
data is combined with satellite views of vegetation and snow cover
to show how fires relate to seasonal changes. The Terra and Aqua
satellites were launched in 1999 and 2002, respectively.
The tour begins by showing extensive grassland fires spreading
across interior Australia and the eucalyptus forests in the
northwestern and eastern part of the continent. The tour then
shifts to Asia where large numbers of agricultural fires are
visible first in China in June 2004, then across a huge swath of
Europe and western Russia in August. It then moves across India
and Southeast Asia, through the early part of 2005. The tour
continues across Africa, South America, and concludes in North
America.
The global fire data show that Africa has more abundant burning
than any other continent. MODIS observations have shown that some
70 percent of the world�s fires occur in Africa. During a fairly
average burning season from July through September 2006, the
visualizations show a huge outbreak of savanna fires in Central
Africa driven mainly by agricultural activities, but also driven
by lightning strikes.
Fires are comparatively rare in North America, making up just 2
percent of the world�s burned area each year. The fires that
receive the most attention in the United States � the uncontrolled
forest fires in the West � are less visible than the wave of
agricultural fires prominent in the Southeast and along the
Mississippi River Valley. Some of the large wildfires that ravaged
Texas this year are visible in the animation.
NASA will extend the its capability to monitor and study global
fires from space with the launch on 28 October of the National
Polar-orbiting Operational Environmental Satellite System
Preparatory Project, known as NPP. The satellite is the first
mission designed to collect data to increase our understanding of
long-term climate change and improve weather forecasts.