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Modeling 100,000-year climate fluctuations in pre-Pleistocene time seriesA 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.
Document ID
19920043472
Document Type
Reprint (Version printed in journal)
Authors
Crowley, Thomas J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kim, Kwang-Yul (Applied Research Corp. College Station, TX, United States)
Mengel, John G. (Applied Research Corp. Landover, MD, United States)
Short, David A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
February 7, 1992
Publication Information
Publication: Science
Volume: 255
ISSN: 0036-8075
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF ATM-90-02808
Distribution Limits
Public
Copyright
Other