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. (C) 2009 Elsevier Ltd. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 974-985 |
| Number of pages | 12 |
| Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
| Volume | 110 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Aug 2009 |
Keywords
- Remote sensing
- Stratospheric chemistry
- Infrared atmospheric remote sounding
- Measurement-model comparisons
- Stratospheric chlorine chemistry
- Stratospheric fluorine chemistry
- COClF
- CCl3F
- 2-DIMENSIONAL MODEL
- FLUORINE
- STRATOSPHERE
- HALOCARBONS
- OZONE
- RETRIEVALS
- SATELLITE
- AIRCRAFT
- CHLORINE
- PACIFIC