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Summer ice and carbon dioxide.

G Kukla, J Gavin

    Science (New York, N.Y.)
    |October 30, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Antarctic sea ice extent significantly decreased from 1973-1980. Earlier 20th-century ice conditions were heavier, and recent temperatures align with carbon dioxide increase predictions.

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    Area of Science:

    • Climatology
    • Glaciology
    • Environmental Science

    Background:

    • Historical data from the 1930s indicate heavier Antarctic summer pack ice conditions compared to recent averages.
    • Satellite imagery reveals a substantial decrease in Antarctic pack ice extent between 1973 and 1980.

    Purpose of the Study:

    • To analyze changes in Antarctic pack ice extent and Northern Hemisphere surface air temperatures.
    • To compare observed climate changes with predictions related to increased atmospheric carbon dioxide.

    Main Methods:

    • Analysis of satellite imagery for Antarctic pack ice extent from 1973-1980.
    • Compilation of historical climate data from atlases and ship reports from the 1930s.
    • Comparison of surface air temperatures in the Northern Hemisphere during two distinct periods (1934-1938 and 1974-1978).

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    Main Results:

    • A decrease of 2.5 million square kilometers in Antarctic pack ice extent was observed between 1973 and 1980.
    • Surface air temperatures in the Northern Hemisphere's melting snow belt were higher in 1974-1978 than in 1934-1938.
    • Observed temperature and ice cover changes qualitatively align with the predicted effects of increased atmospheric carbon dioxide.

    Conclusions:

    • While observed climate trends show qualitative agreement with carbon dioxide increase impacts, a definitive cause-and-effect relationship cannot yet be established.
    • Natural climate variability and other unidentified processes may also contribute to the observed changes in snow, ice cover, and temperature.