Loading ...
Sorry, an error occurred while loading the content.

New Measurements of Stratospheric Ozone Present in the Upper Troposphere

Expand Messages
  • P. Neuman self only
    Livermore Scientists Contribute to New Measurements of Stratospheric Ozone Present in the Upper Troposphere Contact: Anne Stark Phone: (925) 422-9799 E-mail:
    Message 1 of 1 , Apr 9, 2004
    • 0 Attachment
      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
      NR-04-04-01

      -------------------------------------------------

      Livermore Scientists Contribute to New Measurements of Stratospheric
      Ozone
      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
      the
      amount of stratospheric ozone that is present at any given time in the
      upper
      troposphere.

      Working with researchers from the National Oceanic and Atmospheric
      Administration, the University of Colorado, the Jet Propulsion
      Laboratory,
      the National Center for Atmospheric Research, NASA Ames Research Center
      and
      Harvard University, atmospheric scientists Cyndi Atherton and Dan
      Bergmann
      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
      10
      kilometers, and the second level is the more stable stratosphere, which
      extends from 10 to 50 kilometers above the surface and contains 90
      percent
      of the world�s ozone. The tropopause is the transition zone between the
      two
      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
      chloride
      (HCl) in the stratosphere travel downward across the tropopause and into
      the
      upper troposphere. Atherton and Bergmann used this model to simulate
      specific atmospheric events. These results, when compared to
      measurements,
      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
      an
      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
      irritant,
      and can damage materials and crops.

      "This research shows that there are times when a significant amount of
      the
      ozone found in the upper troposphere was due to
      stratosphere-to-troposphere
      transport events," Atherton said. "Continued use of this measurement
      method
      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
      stratospheric
      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
      for
      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
      Energy's
      National Nuclear Security Administration

      UCRL-MI-116408, LLNL Disclaimer
      Thursday, April 8, 2004
      ========

      ** NOTICE: In accordance with Title 17 U.S.C. Section 107, this material
      is
      distributed without profit to those who have expressed a prior interest
      in
      receiving the included information for research and educational purposes.
      **

      AviationWatch is a service provided by the ALLIANCE OF RESIDENTS
      CONCERNING O'HARE. AReCO is an organization dedicated to protecting the
      health, safety and welfare of individuals and communities that are
      affected by the air transport industry.
      For more information see: http://www.areco.org
      To visit your group on the web, go to:
      http://groups.yahoo.com/group/AviationWatch/



      ________________________________________________________________
      The best thing to hit the Internet in years - Juno SpeedBand!
      Surf the Web up to FIVE TIMES FASTER!
      Only $14.95/ month - visit www.juno.com to sign up today!
    Your message has been successfully submitted and would be delivered to recipients shortly.