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Interglacial
MIS 11c
Insolation forcing
Sea level rise
CO2
Ice sheets
Abstract:
Notoriety of the Marine Isotope Stage (MIS) 11c interglacial arises from its long duration, extending over
two precessional cycles, high sea level, and persistence of high atmospheric CO2 concentrations. The
strong climatic response is often considered paradoxical because it was attained under weak boreal
summer insolation forcing, a function of an extended eccentricity minimum and of precession and
obliquity being almost opposite in phase. Here, we trace the characteristics of MIS 11c and explore their
most likely causes. MIS 11c was preceded by the largest Quaternary ice volume expansion of MIS 12,
which ended with a long period of ice rafting and interhemispheric heat transfer. We suggest that the
duration of MIS 12 and the size of ice sheets exceeded a critical threshold that triggered a deglaciation
despite the weak insolation forcing. The weak forcing led to a slow but steady loss of ice volume, that was
sufficient to allow ocean outgassing of CO2, but insufficient to raise sea level within a single precessional
cycle. This gave rise to a prolonged interval with large residual ice sheets and high CO2 concentrations
that is unique in the last 800,000 years. The obliquity-precession antiphasing produced a weak boreal
summer insolation minimum, skipping a glacial inception and leading to continued sea-level rise and
high CO2 concentrations, sustained by carbonate compensation. Full interglacial conditions were ach-
ieved in the second precessional cycle, and the combined strength and length of the interglacial probably
led to loss of some Greenland and Antarctic ice compared to other interglacials. While MIS 11c is highly
unusual in many respects, these appear to be linked to each other through the very weak insolation
forcing, which led to its extended duration, slow sea-level rise and stable CO2 concentrations through a
cocktail of counteracting carbon cycle processes. Although some of these features are also encountered in
other interglacials, their combination with strong interglacial intensity is unique to MIS 11c and this
appears to be a function of the large MIS 12 ice sheets and the high CO2 concentrations from the
beginning of the interglacial.
