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Cloud feedback: a stabilizing effect for the early Earth?

W B Rossow, A Henderson-Sellers, S K Weinreich

    Science (New York, N.Y.)
    |September 24, 1982
    PubMed
    Summary
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    Cloud feedbacks significantly warm early Earth models, showing their importance comparable to solar changes. Strong negative cloud feedbacks may prevent early Earth from freezing over completely.

    Area of Science:

    • Climate science
    • Paleoclimatology
    • Atmospheric physics

    Background:

    • Understanding early Earth's climate is crucial for comprehending planetary habitability.
    • Cloud-climate feedbacks are recognized as significant drivers of Earth's temperature regulation.
    • Previous models often simplified or excluded detailed cloud feedback mechanisms.

    Purpose of the Study:

    • To investigate the impact of cloud variations on early Earth's surface temperature.
    • To quantify the role of cloud-climate feedbacks in early Earth's atmospheric evolution.

    Main Methods:

    • Utilized a climate model simulating early Earth conditions.
    • Varied parameters including cloud cover, optical properties, and altitudinal distribution.
    • Analyzed the resulting mean surface temperatures and feedback effects.

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    Main Results:

    • All examined cloud variations led to warmer temperatures compared to models without cloud feedbacks.
    • Cloud feedbacks were found to be as influential as solar luminosity and atmospheric composition changes.
    • Strong negative cloud feedbacks suggest early Earth might not have been entirely ice-covered.

    Conclusions:

    • Cloud feedbacks play a critical role in regulating early Earth's surface temperature.
    • The presence of significant negative cloud feedbacks could mitigate extreme glaciation.
    • Further research into cloud feedback mechanisms is necessary for definitive conclusions about early atmospheric conditions.