I remember reading a while ago that from September 11th to the 13th/14th (2001) almost all flights (at least in and around the United States) were canceled. Someone noticed that without thousands of planes burning fuel in the atmosphere, the temperature dropped noticeably. This implies that a few degrees of the heat on our earth is caused by us directly and it isn't permanent because it dropped within a few days of planes being grounded.
Where can I find the exact information for this? I'd like to know the specific details and I was hoping someone would know what I'm talking about.
UALog2010-04-26T23:12:51Z
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Actually, the study was on the daily temperature range (the difference between the daily high temperature and the morning low temperature. What this study found was that during those three days when no aircraft was flying, the temperature range between the high and low for those days increased by 1.8 degrees C or 3.2 degrees F.
The reason for this change was due at least partly to the fact the loss of usual aircraft contrails in the sky. Aircraft contrails high in the atmosphere will act like high clouds. They will block out some of the solar radiation during the day, thus keeping the daytime highs slightly lower. During the overnight period, the contrails will help block out some of the long wave radiation from escaping out into space, therefore keeping the temperature slightly warmer. With no contrails in the sky, the daytime highs will be warmer and the night time lows will be cooler. Therefore the temperature range between the daily highs and lows will be larger.
After the airplanes returned to the skies, the temperature range returned to what it was before 9-11.
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