Comment Re:We idolize the dead. (Score 1) 1452
http://www.youtube.com/watch?v=Oifs6ulpd9A
Tell my tale to those who ask. Tell it truly; the ill deeds along with the good, and let me be judged accordingly. The rest... is silence.
http://www.youtube.com/watch?v=Oifs6ulpd9A
Tell my tale to those who ask. Tell it truly; the ill deeds along with the good, and let me be judged accordingly. The rest... is silence.
http://www.noaa.gov/features/02_monitoring/arctic_thinning.html
The "coldness" of the pole is related to the strength of the winds (polar vortex) around the pole in the atmosphere. The south pole generally has strong winds circling it, which works to cut off the south pole's atmosphere from the rest of the world, especially during the southern hemisphere winter. Part of the reason for a stronger vortex is due to ocean surrounding the south pole on all sides, with land masses far away. In addition, the southern hemisphere in general has more ocean compared to land than the northern hemisphere.
In the northern hemisphere, the polar vortex generally has more waves or pertubations in the polar vortex, which help to mix in air from lower latitudes. Some of this is caused by planetary waves that propagate vertically in the atmosphere. These planetary waves are formed generally due to land masses and mountains affecting the atmospheric flow (not this simple but this is the general idea). Generally, the factor that causes the difference in the north and south polar vortices is land mass.
Now relating this all to climate is a bit tricky. It has been seen that as the troposphere warms (lowest layer of the atmosphere), the stratosphere cools. This has been seen in observations in the last 30-50 years (you may argue that 50 years might not be enough to define a long-term trend). The reason for this cooling is basically radiative balance (though I'm oversimplifying it here). If the troposphere warms due to increased greenhouse gasses, then the atmosphere above must cool above it. There cannot be more heat coming in than is leaving the Earth. A good analog to this is Venus. Venus has huge concentrations of greenhouse gasses. We know its surface is very hot (over 400 degrees C), while its upper atmosphere is much cooler than Earth's (gets down below -110 degrees C, compared to about -80 C on Earth).
The tough part is separating the stratospheric cooling due to greenhouse gasses and ozone destruction from CFCs (although we may know this answer once all the CFCs are out of the atmosphere in the future). Increased greenhouse gasses will warm the troposphere and cool the stratosphere. This will lead to more polar stratospheric clouds, leading to more reactions sites for ozone destruction. More ozone destruction means less UV light is absorbed by ozone in the stratosphere. Less UV absorption means a cooler stratosphere which further intensifies the problem.
Politics: A strife of interests masquerading as a contest of principles. The conduct of public affairs for private advantage. -- Ambrose Bierce