Sunday, February 7, 2010

(True or False) In winter, cloudy nights are often warmer than clear lights because of the greenhouse effect?

The greenhouse effect is not limited just to carbon dioxide. Notice that the term itself comes from a greenhouse where the crucial material is GLASS not CO2.





Cloud cover at night tends to retain heat radiated from the earth. In the absence of clouds, this infrared radiation (that it, heat) tends to go directly into space. This happens not just on winter nights but during any season. It's especially noticeable in desert areas: the dryness means fewer clouds, and this means higher temperatures in the day time (increased solar radiation hitting the soil) and lower temperatures at night (increased loss of infrared light). In dry or desert climates, the average temperature difference between the daily high and daily low will be greater than that in areas with more clouds.





Cloud cover isn't the entire explanation, but it's a large part of it.(True or False) In winter, cloudy nights are often warmer than clear lights because of the greenhouse effect?
True, despite what alarmists say, water vapor is a greenhouse gas that amounts to 97% of any ';greenhouse effect';. Without it, while extremes would be warmer, we'd have highs of about 200 and lows of about -300.(True or False) In winter, cloudy nights are often warmer than clear lights because of the greenhouse effect?
This is true. But because the clouds reflect the heat back to earth that is being radiated. On a cloudy night this radiated heat would escape into space. This is what a greenhouse does but is not the greenhouse effect.
False. Clouds are made up of water, and water in its vapor form is not a greenhouse gas.

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