New Measurements of Stratospheric Ozone Present in the Upper Troposphere
- Livermore Scientists Contribute to New Measurements
of Stratospheric Ozone Present in the Upper Troposphere
Contact: Anne Stark
Phone: (925) 422-9799
E-mail: stark8@... FOR IMMEDIATE RELEASE
Date: April 8, 2004
Livermore Scientists Contribute to New Measurements of Stratospheric
Present in the Upper Troposphere
LIVERMORE, Calif. - A team of scientists, including two from the Lawrence
Livermore National Laboratory, have identified a new method to measure
amount of stratospheric ozone that is present at any given time in the
Working with researchers from the National Oceanic and Atmospheric
Administration, the University of Colorado, the Jet Propulsion
the National Center for Atmospheric Research, NASA Ames Research Center
Harvard University, atmospheric scientists Cyndi Atherton and Dan
successfully quantified ozone transport down from the stratosphere during
NASA's 2002 CRYSTAL-FACE mission over Florida.
The research is presented in the April 9 edition of the journal Science.
The atmosphere has several levels: the lowest is the turbulently mixed
troposphere, which extends from the Earth's surface up to approximately
kilometers, and the second level is the more stable stratosphere, which
extends from 10 to 50 kilometers above the surface and contains 90
of the world�s ozone. The tropopause is the transition zone between the
and is approximately the altitude of commercial aircraft flight.
A team of scientists within LLNL's Atmospheric Science Division created a
computer model that can simulate how both ozone (O3) and hydrogen
(HCl) in the stratosphere travel downward across the tropopause and into
upper troposphere. Atherton and Bergmann used this model to simulate
specific atmospheric events. These results, when compared to
validated a novel technique that uses HCl
measurements to better understand the contribution of the stratosphere to
upper tropospheric ozone concentrations. Upper tropospheric ozone plays
important role in global warming and climate change.
Ozone is a highly reactive and toxic gas. Although it blocks incoming
harmful radiation, it also acts as a greenhouse gas, respiratory
and can damage materials and crops.
"This research shows that there are times when a significant amount of
ozone found in the upper troposphere was due to
transport events," Atherton said. "Continued use of this measurement
will lead to a better understanding of how much of this material is
transported to the upper troposphere, where it affects climate and the
chemical balance of the atmosphere."
Until now, no experimental technique could reliably quantify
ozone in the upper troposphere.
Founded in 1952, Lawrence Livermore National Laboratory is a national
security laboratory, with a mission to ensure national security and apply
science and technology to the important issues of our time. Lawrence
Livermore National Laboratory is managed by the University of California
the U.S. Department of Energy's National Nuclear Security Administration.
Lawrence Livermore National Laboratory
Operated by the University of California for the U.S. Department of
National Nuclear Security Administration
UCRL-MI-116408, LLNL Disclaimer
Thursday, April 8, 2004
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