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Science 7 February 1992:
Vol. 255. no. 5045, pp. 705 - 707
DOI: 10.1126/science.255.5045.705
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Articles

Modeling 100,000-Year Climate Fluctuations in Pre-Pleistocene Time Series

THOMAS J. CROWLEY 1, KWANG-YUL KIM 1, JOHN G. MENGEL 2, and DAVID A. SHORT 3

1 Applied Research Corporation, 305 Arguello Drive, College Station, TX 77840
2 Applied Research Corporation, 8201 Corporate Drive, Landover, MD 20785
3 Laboratory for Atmospheres, Code 913, National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, MD 20771

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-latitude 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.

Submitted on August 7, 1991
Accepted on November 5, 1991


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