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First global observations of atmospheric COClF from the Atmospheric Chemistry Experiment mission |
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| Authors: | Dejian Fu Chris D Boone Debra K Weisenstein Gloria L Manney Kaley A Walker |
| Institution: | a Department of Chemistry, University of Waterloo, Waterloo, Canada ON N2L 3G1 b NASA Jet Propulsion Laboratory/California Institute of Technology, Pasadena, CA 91101, USA c Department of Chemistry, University of York, York YO10 5DD, UK d Atmospheric and Environmental Research, Inc., Lexington, MA 02421, USA e NASA Langley Research Center, Science Directorate, Hampton, VA 23681, USA f Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA g Department of Physics, University of Toronto, Toronto, Canada ON M5S 1A7 |
| Abstract: | Carbonyl chlorofluoride (COClF) is an important reservoir of chlorine and fluorine in the Earth's atmosphere. Satellite-based remote sensing measurements of COClF, obtained by the Atmospheric Chemistry Experiment (ACE) for a time period spanning February 2004 through April 2007, have been used in a global distribution study. There is a strong source region for COClF in the tropical stratosphere near 27 km. A layer of enhanced COClF spans the low- to mid-stratosphere over all latitudes, with volume mixing ratios of 40-100 parts per trillion by volume, largest in the tropics and decreasing toward the poles. The COClF volume mixing ratio profiles are nearly zonally symmetric, but they exhibit a small hemispheric asymmetry that likely arises from a hemispheric asymmetry in the parent molecule CCl3F. Comparisons are made with a set of in situ stratospheric measurements from the mid-1980s and with predictions from a 2-D model. |
| Keywords: | Remote sensing Stratospheric chemistry Infrared atmospheric remote sounding Measurement-model comparisons Stratospheric chlorine chemistry Stratospheric fluorine chemistry COClF CCl3F |
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