Partitioning between the inorganic chlorine reservoirs HCl and ClONO2 during the Arctic winter 2005 from the ACE-FTS G. Dufour1,*, R. Nassar1, C. D. Boone1, R. Skelton1, K. A. Walker1, P. F. Bernath1, C. P. Rinsland2, K. Semeniuk3, J. J. Jin3, J. C. McConnell3, and G. L. Manney4,5 1Department of Chemistry, University of Waterloo, Ontario, Canada 2NASA Langley Research Center, Hampton, Virginia, USA 3Department of Space Science and Engineering, York University, Ontario, Canada 4NASA Jet Propulsion Laboratory/California Institute of Technology, Pasadena, California, USA 5New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA *now at: Laboratoire de Météorologie Dynamique/Institut Pierre Simon Laplace, Palaiseau, France
Abstract. From January to March 2005, the Atmospheric Chemistry Experiment high
resolution Fourier transform spectrometer (ACE-FTS) on SCISAT-1 measured
many of the changes occurring in the Arctic (50–80° N) lower stratosphere
under very cold winter conditions. Here we focus on the partitioning between
the inorganic chlorine reservoirs HCl and ClONO2 and their activation
into ClO. The simultaneous measurement of these species by the ACE-FTS
provides the data needed to follow chlorine activation during the Arctic
winter and the recovery of the Cl-reservoir species ClONO2 and HCl. The
time evolution of HCl, ClONO2 and ClO as well as the partitioning
between the two reservoir molecules agrees well with previous observations
and with our current understanding of chlorine activation during Arctic
winter. The results of a chemical box model are also compared with the
ACE-FTS measurements and are generally consistent with the measurements.
Citation: Dufour, G., Nassar, R., Boone, C. D., Skelton, R., Walker, K. A., Bernath, P. F., Rinsland, C. P., Semeniuk, K., Jin, J. J., McConnell, J. C., and Manney, G. L.: Partitioning between the inorganic chlorine reservoirs HCl and ClONO2 during the Arctic winter 2005 from the ACE-FTS, Atmos. Chem. Phys., 6, 2355-2366, doi:10.5194/acp-6-2355-2006, 2006.