Partitioning between the inorganic chlorine reservoirs HCl and ClONO2 during the Arctic winter 2005 from the ACE-FTS

[摘要] From January to March 2005, the Atmospheric Chemistry Experiment highresolution Fourier transform spectrometer (ACE-FTS) on SCISAT-1 measuredmany of the changes occurring in the Arctic (50–80° N) lower stratosphereunder very cold winter conditions. Here we focus on the partitioning betweenthe inorganic chlorine reservoirs HCl and ClONO₂ and their activationinto ClO. The simultaneous measurement of these species by the ACE-FTSprovides the data needed to follow chlorine activation during the Arcticwinter and the recovery of the Cl-reservoir species ClONO₂ and HCl. Thetime evolution of HCl, ClONO₂ and ClO as well as the partitioningbetween the two reservoir molecules agrees well with previous observationsand with our current understanding of chlorine activation during Arcticwinter. The results of a chemical box model are also compared with theACE-FTS measurements and are generally consistent with the measurements.

[学科分类] 大气科学