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Here we show that there was an anomalous increase in the average diurnal temperature range (that is, the difference between the daytime maximum and night-time minimum temperatures) for the period 11–14 September 2001. Because persisting contrails can reduce the transfer of both incoming solar and outgoing infrared radiation4, 5 and so reduce the daily temperature range, we attribute at least a portion of this anomaly to the absence of contrails over this period.
So, very basically, it's colder at night and hotter during the day.
Quote from: imatfaal on 24/08/2011 10:43:03So, very basically, it's colder at night and hotter during the day.I think that would be the case in the absence of contrails, so contrails have the opposite effect.