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100,000-Year Problem: Geologic Temperature Record, Insolation, Climate, Ice Age, Orbital Forcing, Nicholas Shackleton, Continental Drift, Dole Effect
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Dieser Artikel gilt, aufgrund seiner Grösse, beim Versand als 2 Artikel!
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| Please note that the content of this book primarily consists of articles
available from Wikipedia or other free sources online. The 100,000¿year
problem is a discrepancy between past temperatures and the amount of
incoming solar radiation, or insolation. The former rises and falls
according to the strength of radiation from the sun, the distance from
the earth to the sun, and the tilt of the Earth's poles. However, the
ice-age cycle, which grows and shrinks periodically on a 100,000¿year
(100 ka) timescale, does not correlate well with any of these factors.
Due to variations in the Earth's orbit, the amount of insolation varies
with periods of around 21,000, 40,000, 100,000, and 400,000 years.
Variations in the amount of solar heating drive changes in the climate
of the Earth, and are recognised as a key factor in the timing of
initiation and termination of ice ages. Spectral analysis shows that the
most powerful climate response is at 100,000¿year period, but the
orbital forcing at this period is small. |
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