The phrase "atmosphere temperature" refers to how hot or cold the air is in a particular location. It describes the measure of heat present in the surrounding air. Full definition
Overall, significant improvements over previous models are seen, particularly in upper atmosphere temperatures and winds, cloud heights, precipitation, and sea level pressure. (pubs.giss.nasa.gov)
This trend is opposite that seen on gas giants, where the same forcing shows an increase in the day - night atmosphere temperature contrast. (haqqmisra.net)
However there has been a vigorous debate about whether the increase in lower atmosphere temperatures has slowed down. (theguardian.com)