Page 196 - Earth's Climate Past and Future
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172 PART III • Orbital-Scale Climate Change
A FIGURE 9-19 Conceptual phases of
Insolation
ice sheet evolution The long-term
Max
evolution of ice sheets should pass
through three phases. (A, B) In the
preglaciation phase, no ice
accumulates. (C, D) In the small
glaciation phase, ice accumulates
during summer insolation minima but
Min Glaciation Threshold
melts entirely during the next insolation
maximum. (E, F) In the large glaciation
North South phase, ice persists through weak
Equilibrium Line Ablation summer insolation maxima and melts
only during larger maxima.
B
C
Insolation
Max
Glaciation Threshold
Min
North South
Equilibrium Line Equilibrium Line
Accumulation Ablation
D
E
Insolation Glaciation
Max Threshold
Min
North South
Equilibrium Line Equilibrium Line Ablation
Accumulation
F
