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Volumn 277, Issue 5323, 1997, Pages 215-218

Glacial cycles and astronomical forcing

Author keywords

[No Author keywords available]

Indexed keywords

ASTRONOMICAL FORCING; GLACIAL CYCLE; INCLINATION; ORBITAL PLANE;

EID: 0030840447     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.277.5323.215     Document Type: Article
Times cited : (147)

References (44)
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    • note
    • The Blackman-Tukey method obtains the spectral power by first forming the autocorrelation function of the data and then performing a Fourier transform. If only a partial autocorrelation is performed, for example, if the maximum delay is only 1/3 of the time interval of the data set, then we say the "lag" is 1/3. The spectral peak in the lagged analysis is broadened by a factor equal to 1/lag.
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    • note
    • Spectral power is computed by interpolating the data to equally spaced points, removing the average (but not the trend), using a boxcar window (that is, taking all points equally weighted), and then taking the square of the Fourier transform. The spectrum is normalized to unit mean. The data presented here have also been examined with other spectral methods (such as Blackman-Tukey with various lags, and Lomb-Spergel) and other windows (such as Hanning and Parzen). The conclusions are robust to all data methods, excluding those that significantly degrade the resolution and therefore could not resolve the narrow features from which we draw our conclusions.
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    • note
    • -6) = 99.98%.
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    • note
    • The age of 1.5 Ma corresponds to an adjusted depth of 66.83 m, and the age of 2.5 Ma corresponds to an adjusted depth of 112.40 m. These give an average sedimentation rate of 45.6 m per million years.
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    • Additional data were obtained over the World Wide Web from the site maintained by the National Oceanic and Atmospheric Administration
    • We thank W. Alvarez and the Renaissance Geology Group for many stimulating discussions, and M. Raymo, W. Berger, M. Yasuda, P. Olsen, and S. Clemens for providing data in digital form. Additional data were obtained over the World Wide Web from the site maintained by the National Oceanic and Atmospheric Administration at www.ngdc.noaa.gov. Supported in part by the Department of Energy (under contract DE-AC03-7bSF00098) and by the Ann and Gordon Getty Foundation.
    • Raymo, M.1    Berger, W.2    Yasuda, M.3    Olsen, P.4    Clemens, S.5


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.