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Multiple thermal maxima during the holocene.

O K Davis

    Science (New York, N.Y.)
    |August 10, 1984
    PubMed
    Summary
    This summary is machine-generated.

    The astronomical theory of climate change suggests multiple Holocene thermal maxima, unlike traditional views. Ecosystem responses reveal varied thermal maximum timing based on climate variables and seasons.

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    Area of Science:

    • Paleoclimatology
    • Astronomical Theory of Climate Change
    • Holocene Climate Dynamics

    Background:

    • Traditional Holocene climate change models propose a single thermal maximum around 6000 years ago.
    • The astronomical theory of climate change posits cyclical thermal maxima linked to seasonal insolation variations.
    • Earth's orbital parameters, specifically the perihelion-equinox relationship, influence seasonal insolation over a 22,000-year cycle.

    Purpose of the Study:

    • To evaluate the astronomical theory of climate change as an alternative to traditional Holocene chronologies.
    • To investigate the timing of Holocene thermal maxima using ecosystem responses to different seasonal climates.
    • To compare paleoclimatic data sensitive to early summer with reconstructions reflecting late summer conditions.

    Main Methods:

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    • Analyzing the relationship between Earth's orbital cycles (perihelion-equinox) and Holocene insolation patterns.
    • Utilizing climatic reconstructions derived from ecosystem responses, particularly vegetation types, to late summer climate.
    • Comparing these reconstructions with paleoclimatic data sensitive to early summer climate.

    Main Results:

    • Late summer insolation peaked approximately 5000 years ago, while early summer insolation peaked around 13,000 years ago.
    • Ecosystem-based climatic reconstructions indicate a later Holocene thermal maximum compared to data sensitive to early summer climate.
    • In southern Idaho, distinct vegetation types showed thermal maxima at different Holocene periods, contingent on the controlling climatic variable.

    Conclusions:

    • The astronomical theory provides a framework for understanding multiple Holocene thermal maxima.
    • Ecosystem responses to climate are sensitive to specific seasonal insolation changes, leading to varied timing of thermal maxima.
    • Reconstructed Holocene climate dynamics in southern Idaho support the seasonal predictions of the astronomical theory of climate change.