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Science. 1979 Dec 21;206(4425):1402-4.

The "little ice age": northern hemisphere average observations and model calculations.


Numerical energy balance climate model calculations of the average surface temperature of the Northern Hemisphere for the past 400 years are compared with a new reconstruction of the past climate. Forcing with volcanic dust produces the best simulation, whereas expressing the solar constant as a function of the envelope of the sunspot number gives very poor results.

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