Posted by: KenN
Posted by: aShogunNamedMarcus
During the air travel ban post 9/11, global temps dropped 1-2c.
Incorrect. Local temperatures in US dropped due to weather patterns. Global temperatures did not drop, and any localized temperature drops were not attributable to less air travel.
"Thus, both datasets show that low clouds are the dominant cloud influence on DTR. High clouds, of which contrails are a subset, have a very minor, if any, influence on the DTR anomalies.
We conclude that the increase of the diurnal temperature range over the United States during the three-day grounding period of 11 – 14 September 2001 cannot be attributed to the absence of contrails. While missing contrails may have affected the DTR, their impact is probably too small to detect with a statistical significance. The variations in high cloud cover, including contrails and contrail-induced cirrus clouds, contribute weakly to the changes in the diurnal temperature range, which is governed primarily by lower altitude clouds, winds, and humidity"
So what happened to those clouds and is Sept 11-14 2001 the only instance of this weather subset?