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by roadside_picnic 254 days ago
Contrails observably suppress the Diurnal Temperature Range (i.e. they make it cooler during the day).

How could this be observed you might ask? It turns out there was a study done immediately after the grounding of airplanes during the September 11th, 2001 events to take advantage of this unique incidence of effectively halting all air transportation for a few days [0]

0. https://journals.ametsoc.org/view/journals/clim/17/5/1520-04...