Paleoclimatic variability at frequencies ranging from 1 cycle per 10000 years to 1 cycle per 1000 years: evidence for nonlinear behaviour of the climate system

Pestiaux, P.;Van Der Mersch, I.;Berger, André;Duplessy, J.C.
(1988) Climatic Change : an interdisciplinary, international journal devoted to the description, causes and implications of climatic change — Vol. 12, n° 1, p. 9-37 (1988)

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  • Pestiaux, P.
    Author
  • Van Der Mersch, I.
    Author
  • Berger, AndréUCLouvain
    Author
  • Duplessy, J.C.
    Author
Abstract
The paleoclimatic variability at frequencies ranging from 10/sup -4/ cycle per year (cpy) to 10/sup -3/ cpy is investigated using a set of three deep-sea cores from the Indian Ocean. Three frequency bands of high paleoclimatic variability are first defined using upper and lower limits of the significant spectral power concentrations: the bands are centered around the spectral maxima located at 10.3, 4.7, and 2.5 kyr. The localization of spectral lines is then refined by high-resolution spectral analysis. Some of the resulting lines have frequencies which are close to those previously detected in other paleoclimatic records, including the precessional peak at 19 kyr. Additional lines are also in good correspondence with the response of a nonlinear climatic oscillator forced by insolation variations, including peaks at 13 kyr, 10.4 kyr and 9.4 kyr. This correspondence suggests orbital forcing. Moreover, for the Indian Ocean which is influenced by the monsoon circulation, it is plausible that the precessional contribution of the forcing interacts strongly with the precipitation-temperature feedback used in the model, thus emphasizing the nonlinearity of the response.
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Pestiaux, P., Van Der Mersch, I., Berger, A., & Duplessy, J. C. (1988). Paleoclimatic variability at frequencies ranging from 1 cycle per 10000 years to 1 cycle per 1000 years: evidence for nonlinear behaviour of the climate system. Climatic Change : an interdisciplinary, international journal devoted to the description, causes and implications of climatic change, 12(1), 9-37. https://hdl.handle.net/2078.5/45620 (Original work published 1988)