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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.
They found two distinct bursts of ice cap growth, one starting about A.D. 1280 and the other about A.D. 1450. Both of those dates coincide with increases in stratospheric aerosols tied to major volcanic eruptions in the tropics.
Originally posted by ROBL240
The question right now is wether this is just a temporary lowering of the Suns surface activity, or a significant trend leading to a Maunder/Dalton Minimum.