Earth  ID: 11626

Ozone-Depleting Compound Persists

Earth's atmosphere contains an unexpectedly large amount of an ozone-depleting compound from an unknown source decades after the compound was banned worldwide.

The compound, carbon tetrachloride, was used in applications such as dry cleaning and as a fire-extinguishing agent, until its regulation in 1987 under the Montreal Protocol along with other chlorofluorocarbons that destroy ozone and contribute to the ozone hole over Antarctica. Parties to the Montreal Protocol reported zero new emissions between 2007-2012.

However, new research led by Qing Liang at NASA's Goddard Space Flight Center in Greenbelt, Maryland, shows that worldwide emissions of carbon tetrachloride average 39 kilotons per year – approximately 30 percent of peak emissions prior to the international treaty going into effect. Now that scientists have quantified the emissions they can begin investigating where they are coming from. Are there industrial leakages, large emissions from contaminated sites, or some other unknown source?


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Kayvon Sharghi (USRA): Animator
Kayvon Sharghi (USRA): Video Editor
Paul Newman (NASA/GSFC): Interviewee
Qing Liang (USRA): Interviewee
Kayvon Sharghi (USRA): Narration
Kayvon Sharghi (USRA): Narrator
Kayvon Sharghi (USRA): Producer
Paul Newman (NASA/GSFC): Scientist
Qing Liang (USRA): Scientist
Aaron E. Lepsch (ADNET Systems, Inc.): Project Support
Joy Ng (USRA): Videographer
Kathryn Hansen (Wyle Information Systems): Writer
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NASA's Goddard Space Flight Center

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Narrated Movies

Goddard TV Tape:
G2014-077 -- Carbon Tetrachloride

SVS >> Earth
SVS >> Ozone depletion
GCMD >> Earth Science >> Atmosphere
GCMD >> Earth Science >> Atmosphere >> Atmospheric Chemistry
GCMD >> Earth Science >> Atmosphere >> Atmospheric Chemistry/Oxygen Compounds >> Ozone
DLESE >> Narrated
NASA Science >> Earth

GCMD keywords can be found on the Internet with the following citation: Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version