Modeling 100,000-year climate fluctuations in pre-Pleistocene time series

Details Modeling 100,000-year climate fluctuations in pre-Pleistocene time series Modeling 100,000-year climate fluctuations in pre-Pleistocene time series

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...255..705c&link_type=abstract

Science (ISSN 0036-8075), vol. 255, Feb. 7, 1992, p. 705-707.

Mathematics

Logic

23

Climate Change, Equatorial Regions, Monsoons, Lakes, Perihelions, Secular Variations, Temperature Distribution

Scientific paper

A number of pre-Pleistocene climate records exhibit significant fluctuations at the 100,000-year (100-ky) eccentricity period, before the time of such fluctuations in global ice volume. The origin of these fluctuations has been obscure. Results reported here from a modeling study suggest that such a response can occur over low-altitude land areas involved in monsoon fluctuations. The twice yearly passage of the sun across the equator and the seasonal timing of perihelion interact to increase both 100-ky and 400-ky power in the modeled temperature field. The magnitude of the temperature response is sufficiently large to leave an imprint on the geologic record, and simulated fluctuations resemble those found in records of Triassic lake levels.

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