"Atmospheric cooling" refers to a decrease in the average temperature of the Earth's atmosphere. It means that the air around us is getting colder over a certain period of time. Full definition
So we have the surprising logical conclusion that GHGs should actually facilitate atmospheric cooling by permitting upward radiation which could not otherwise occur. (newclimatemodel.com)
GHG atmospheric warming and atmospheric cooling delay, are physically real processes; that virtually nobody disputes. (wattsupwiththat.com)
As in previous tables, signs are chosen so that increased atmospheric cooling is positive. (hannahlab.org)