June 20, 2007

Tabatha Thompson Headquarters, Washington 202-358-3895

Jim Scott University of Colorado, Boulder 303-492-3114

MEDIA ADVISORY: M07-68

NASA MEDIA TELECONFERENCE ON UPCOMING CLIMATE, OZONE EXPEDITION

WASHINGTON -- Scientists planning NASA's largest Earth science expedition of the year will hold a media teleconference on Wednesday, June 27, at 2 p m EDT to discuss the upcoming Tropical Composition, Cloud and Climate Coupling (TC4) field campaign

The TC4 study will tackle challenging questions about Earth's ozone layer and climate using coordinated observations from satellites and high-flying NASA airplanes Researchers will study how chemical compounds in the air are transported to the stratosphere, the area of the atmosphere that contains most of Earth's ozone They will investigate how this vertical transport of water and chemicals affects climate-influencing cirrus clouds, and the chemistry of the upper atmosphere, of which ozone is an important component The campaign will be based out of San Jose, Costa Rica, starting in mid-July

Briefing participants are:

-- Michael Kurylo, TC4 program scientist, NASA Headquarters, Washington -- Hal Maring, TC4 program scientist, NASA Headquarters -- David Starr, TC4 mission scientist, NASA Goddard Space Flight Center, Greenbelt, Md -- Brian Toon, TC4 mission scientist, University of Colorado, Boulder

Media interested in participating in the teleconference should call 888 664-9853 The international toll number is 210 234-0004 The passcode is "TC4 " At the time of the teleconference, streaming audio will be available at:

http://www nasa gov/newsaudio

Images and supporting data will be available during the teleconference at:

http://www nasa gov/formedia

-end-

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