Unified structure in Quaternary climate

Gauthier, John H.

doi:10.1029/1999gl900086

Cited by 13 publications

(4 citation statements)

References 21 publications

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“… Gauthier [1999] has produced power spectra for several different types of climatic proxy records. A tree ring growth index spectrum for an 8000‐year record showed an almost white spectrum (but note that more recent analyses have shown different behavior).…”

Section: Discussionmentioning

confidence: 99%

Power spectrum of sea level change over fifteen decades of frequency

Harrison

2002

Geochem Geophys Geosyst

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[1] The power spectrum of relative sea level change has been estimated over more than 15 orders of magnitude in frequency, from a frequency of 1/(591 Ma) to a frequency of 1/(5 s). Although there are still regions of the spectrum where data sampling and duration do not allow the power to be calculated, most notably between periods of 100-1000 years, the general shape of the spectrum is that in which the power depends on the square of the reciprocal frequency, apart from periods between 1 and 100 years where the power spectrum falls off less steeply with increasing frequency. A spectrum in which power depends on reciprocal frequency squared is the same spectrum as that calculated from a random walk signal of finite length. There are some causes that have defined frequencies, such as those associated with tides and the Milankovitch cycles of the ice ages, but there is also a continuum of relative sea level change that requires other causes. The implications of this are discussed in the light of global change and heating of the lithosphere from the bottom.

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Section: Discussionmentioning

confidence: 99%

Power spectrum of sea level change over fifteen decades of frequency

Harrison

2002

Geochem Geophys Geosyst

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“…For example, time series in Figures 4 and 7 are similar to the curves in Figure 2 showing chaos and mixed mode oscillations. Gauthier (1999) notes that the Quaternary climate record tends to a unified geometric structure of superimposed aperiodic oscillations starting at the 11-year sunspot cycle, and spaced by powers of 2 in period through the major 90000 year glacial cycle. Climate cycles that do not fall in this structure typically correspond to harmonics of the structure oscillations.…”

Section: Highly Non-linear Systems Far From Equilibriummentioning

confidence: 99%

Abrupt and sudden climatic transitions and fluctuations: a review

Lockwood¹

2001

Intl Journal of Climatology

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This review paper summarizes recent research work on abrupt climatic changes and oscillations. The climatic system is viewed as a dissipative, highly non-linear system, under non-equilibrium conditions, and, as such, should be expected to have some unusual properties. These unusual properties include bifurcation points with marked instability just before the point, magnification of semi-periodic oscillations around bifurcation points, and variations in the strength of teleconnections with distance from equilibrium. These properties are discussed and illustrated for the climatic system using both the historical, Holocene and glacial climatic records. It is found that there are abrupt climatic changes and oscillations on all time-scales. The amplitudes and frequencies of climate variability and teleconnections are found to vary between different time periods. A number of persistent oscillations exist, particularly one about 1500 years, but their amplitudes vary considerably between time periods. The Holocene appears to be no more climatically benign than the similar period in the Eemian. The importance of the North Atlantic thermohaline circulation for generating abrupt climatic changes in Europe, particularly in association with sudden pulses of fresh water, is illustrated. The concept of antiphase temperature changes between the North and South Atlantic is discussed. Externally generated abrupt climatic deteriorations owing to explosive volcanic eruptions and variations in solar irradiance are also discussed.

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“…and Shaffer et al (1996) The existence of an orbital clock, defined below, that times change in the Devils Hole record , DTN: GS000200005121.003) may not indicate climate change is caused by change in orbital parameters. Change in orbital parameters may simply be correlated with some other factor that causes climate change, such as solar output (Gauthier 1999), or may be a relatively minor factor, but one that tips the balance and drives the earth's climate system over some unknown threshold (Shaffer et al 1996). Although the relation with timing of past climate change with changes in the earth-orbital parameters provides information about the timing of climate change, it does not imply magnitude or nature of climate change.…”

Section: Timing Of Past-climate Change and Earth-orbital Parametersmentioning

confidence: 99%

Future Climate Analysis

Houseworth¹

2001

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Unified structure in Quaternary climate

Cited by 13 publications

References 21 publications

Power spectrum of sea level change over fifteen decades of frequency

Power spectrum of sea level change over fifteen decades of frequency

Abrupt and sudden climatic transitions and fluctuations: a review

Future Climate Analysis

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