HOCl retrievals from the Atmospheric Chemistry Experiment. (April 2021)

• Record Type: Journal Article
• Authors: Bernath, P.F.; Dodandodage, R.; Boone, C.D.; Crouse, J.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 264(2021)
• Publication Date: 2021-04
• Subjects: Chlorofluorocarbons -- Ozone hole -- Satellite remote sensing -- Fourier transform spectroscopy; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2021.107559
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: Atmospheric HOCl retrieval from ACE-FTS spectra recorded from orbit. Global HOCl altitude-latitude distributions including seasonal effects. HOCl enhancements in Antarctic ozone hole. Trend analysis of HOCl abundance. Abstract: HOCl is a chlorine reservoir molecule found in the stratosphere and in the marine boundary layer. In the stratosphere, it originates from anthropogenic emissions of long-lived chlorine-containing molecules as chlorofluorocarbons (CFCs). HOCl is also a key species in polar ozone destruction and the formation of the Antarctic ozone hole. A new HOCl retrieval has been developed using solar occultation spectra recorded by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) from orbit. Altitude-latitude volume mixing ratio (VMR) distributions of HOCl are presented for the entire mission (2004-2020) and for four seasonal quarters. A time series of quarterly averages for the region 60°S-60°N, 35.5-39.5 km altitude shows a marginally significant trend of -0.23±0.11 ppt/year consistent with the success of the Montreal Protocol.