-Caveat Lector-
>Earth tilt is easily measurable, what data do you have that it has
>changed and is causing global warming.
>The crap these people try to come up with to explain away reality.
>LOL!
>Steve
Dear Gia:
Please save us from the Globalwarming cultists.
Cyclical variation is related to the changes in the tilt (obliquity) of the
Earth's
axis of rotation over a 41,000 year period.
During the 41,000 year cycle the tilt can deviate from approximately 22.5
to 24.5 degrees. At the present time, the tilt of the Earth's axis is 23.5
degrees. When the tilt is small there is less climatic variation between the
summer and winter seasons in the middle and high latitudes. Winters tend
to be milder and summers cooler. Warmer winters allow for more snow to
fall in the high latitude regions. When the atmosphere is warmer it has a
greater
ability to hold water vapor and therefore more snow is produced at areas of
frontal or orographic uplift. Cooler summers cause snow and ice to
accumulate on the Earth's surface because less of this frozen water is
melted. Thus, the net effect of a smaller tilt would be more extensive
formation of glaciers in the polar latitudes.
Periods of a larger tilt result in greater seasonal climatic variation in
the middle and high latitudes. At these times, winters tend to be colder
and summers warmer. Colder winters produce less snow because of
lower atmospheric temperatures. As a result, less snow and ice
accumulates on the ground surface. Moreover, the warmer summers
produced by the larger tilt provide additional energy to melt and evaporate
the snow that fell and accumulated during the winter months. In conclusion,
glaciers in the polar regions should be generally receding, with other
contributing factors constant, during this part of the obliquity cycle.
Computer models and historical evidence suggest that the Milankovitch
cycles exert their greatest cooling and warming influence when the troughs
and peaks of all three cycles( tilt, volcanic activity,solar eruptions)
coincide with
each other.
flw
On 23 Jul 01, at 22:51, [EMAIL PROTECTED] wrote:
> Earth tilt (the tilt of the earth vis a vis the sun as it rotates) has a
> profound
> effect on the degree of solar radiation that heats the earth. A slight
> change
> in tilt can effect the earth's mean temperature by many degrees. Earth
> tilt is not finite but can and does change. How and why is little
> understood.
> Denying earth tilt as a climate factor is as silly as calling CO2 a
> "pollutant."
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