Removal of chlorofluorocarbons by increased mass exchange between the stratosphere and troposphere in a changing climate

摘要: Chlorofluorocarbons (CFCs), along with bromine compounds, have been unequivocally identified as being responsible for most of the anthropogenic destruction stratospheric ozone. With curbs on emissions these substances, recovery ozone layer will depend their removal from atmosphere. As CFCs no significant tropospheric process, but are rapidly photolysed above lower stratosphere, timescale is set mainly by rate at which air transported troposphere into stratosphere. Using a global climate model we predict that, in response to projected changes greenhouse-gas concentrations during first half twenty-first century, this mass exchange increase 3% per decade. This due more vigorous extra-tropical planetary waves emanating troposphere. We estimate that accelerate an extent levels currently predicted 2050 and 2080 occur 5 10 years earlier, respectively.