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the 15 C average global temperature figure, how is this even correct?


the 15 C average global temperature figure, how is this even correct?09-01-2016 01:04
Tai Hai Chen
★★★★☆
(1041)
Earth has day and night, four seasons, land and ocean, air and cloud, different latitudes and angles of the Sun. There is no way this 15 C global average temperature, which assumes the Earth's surface is a flat plane and the Sun is directly overhead, is correct or even meaningful for that matter. If you are to measure the Sun's heating effect on Earth's surface, I think it's best to use the equator's day time temperature at noon, which is about 30 C, because, at the equator, there is no seasonal effect on temperature and cloud cover.

I quote

This absorption and radiation of heat by the atmosphere—the natural greenhouse effect—is beneficial for life on Earth. If there were no greenhouse effect, the Earth's average surface temperature would be a very chilly -18°C (0°F) instead of the comfortable 15°C (59°F) that it is today.


http://earthobservatory.nasa.gov/Features/GlobalWarming/page2.php
Edited on 09-01-2016 01:19
09-01-2016 01:20
Tai Hai Chen
★★★★☆
(1041)
Here is a discussion on how they got -18 C as what Earth's temperature would be if there were no atmosphere.

http://climateofsophistry.com/2012/11/06/on-the-absence-of-a-measurable-greenhouse-effect-part-1-the-failure-of-ipcc-energy-budgets/
Edited on 09-01-2016 01:28
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