R. Nassar, et al.
A global inventory of stratospheric chlorine in 2004
Journal of Geophysical Research: Atmospheres, 111(22), D22312, 2006; doi: 10.1029/2006JD007073
HCl CCl3F CHClF2 CCl2F2 ClONO2 COClF CH3Cl CCl4 C2Cl3F2 C2Cl3F3 ClO Middle atmosphere Atmosphere Impacts of global change ACE-FTS chlorine stratosphere


[1] Total chlorine (ClTOT) in the stratosphere has been determined using the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) measurements of HCl, ClONO2, CH3Cl, CCl4, CCl3F (CFC-11), CCl2F2 (CFC-12), CHClF2 (HCFC-22), CCl2FCClF2 (CFC-113), CH3CClF2 (HCFC-142b), COClF, and ClO supplemented by data from several other sources, including both measurements and models. Separate chlorine inventories were carried out in five latitude zones (60°–82°N, 30°–60°N, 30°S–30°N, 30°–60°S, and 60°–82°S), averaging the period of February 2004 to January 2005 inclusive, when possible, to deal with seasonal variations. The effect of diurnal variation was avoided by only using measurements taken at local sunset. Mean stratospheric ClTOT values of 3.65 ppbv were determined for both the northern and southern midlatitudes (with an estimated 1σ accuracy of ±0.13 ppbv and a precision of ±0.09 ppbv), accompanied by a slightly lower value in the tropics and slightly higher values at high latitudes. Stratospheric ClTOT profiles in all five latitude zones are nearly linear with a slight positive slope in ppbv/km. Both the observed slopes and pattern of latitudinal variation can be interpreted as evidence of the beginning of a decline in global stratospheric chlorine, which is qualitatively consistent with the mean stratospheric circulation pattern and time lag necessary for transport.


  author = "R. Nassar and P. F. Bernath and C. D. Boone and C. Clerbaux and P. F. Coheur and G. Dufour and L. Froidevaux and E. Mahieu and J. C. McConnell and S. D. McLeod and D. P. Murtagh and C. P. Rinsland and K. Semeniuk and R. Skelton and K. A. Walker and R. Zander",
  title = "A global inventory of stratospheric chlorine in 2004",
  year = 2006,
  journal = "Journal of Geophysical Research: Atmospheres",
  volume = 111,
  number = 22,
  pages = "D22312",
  month = "Nov",
  keywords = "HCl, CCl3F, CHClF2, CCl2F2, ClONO2, COClF, CH3Cl, CCl4, C2Cl3F2, C2Cl3F3, ClO, Middle atmosphere, Atmosphere, Impacts of global change, ACE-FTS, chlorine, stratosphere",
  doi = "10.1029/2006JD007073",
  url = ""
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