HCl content has ceased to increase in the atmosphere of the Northern Hemisphere

Abstract

According to the spectroscopy data on the HCl content analyzed in Peterhof in 2009–2016 and in a number of NDACC stations in the Northern Hemisphere, growth in the HCl content observed since 2007 and caused by changes in the stratospheric circulation stopped in 2010–2011. As follows from the experimental data, a decrease in the HCl content estimated in Peterhof at 4.4 × 10¹³ cm^–2/year or ~1.0%/year started again.