Atmospheric HCFC-22 total columns near St. Petersburg: stabilization with start of a decrease. Issue 11 (2nd June 2020)

• Record Type: Journal Article
• Authors: Polyakov, Alexander; Virolainen, Yana; Poberovskiy, Anatoliy; Makarova, Maria; Timofeyev, Yuriy
• Is Part Of: International journal of remote sensing. Volume 41:Issue 11(2020)
• Page Start: 4365
• Page End: 4371
• Publication Date: 2020-06-02
• Subjects: Remote sensing -- Periodicals; Télédétection -- Périodiques; 621.3678
• DOI: 10.1080/01431161.2020.1717668
• Languages: English
• ISSNs: 0143-1161

Abstract

ABSTRACT: We study the changes in the growth rate of atmospheric HCFC-22 (CHClF2, or chlorodifluoromethane) total column (TC) in the vicinity of St. Petersburg, Russia (60° N). Although HCFC-22 surface concentrations at the two nearest sites of the Halocarbons and other Atmospheric Trace Species group (HATS) (53.3° N and 71.3° N) and mean HCFC-22 mixing ratios in the upper troposphere measured by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE FTS) in the latitude range of 55‒65° N continue to increase, their growth rate is slowing down, especially in the last three years. Analysis of the temporal variability of HCFC-22 TCs measured at the St. Petersburg site of Network for the Detection of Atmospheric Composition Change (NDACC) shows that its total atmospheric abundancy reached a maximum in 2016‒2017 and is currently decreasing. Thus, the measurements in the atmosphere above St. Petersburg have detected a local decrease of the HCFC-22 content, which demonstrates the effectiveness of restrictions on the production of HCFC-22.