Atmospheric CO2 drove climate change during longest interglacial

There exist several high-resolution records documenting almost all aspects of terrestrial and marine climate through MIS 11. However, there is neither a clear understanding about how climactic parameters such as atmospheric carbon dioxide (CO₂), sea surface temperature, the isotopic makeup of carbon in marine and terrestrial reservoirs, and annual air temperature interact, nor a consensus regarding the major drivers of climate change during this interval.

Using 15 of the most robust proxy records of marine and terrestrial climate, Das Sharma et al. employ new statistical and mathematical techniques to quantify the interactions among climatic parameters and to investigate which of these parameters could be the primary drivers of climate change during MIS 11. The authors find that atmospheric CO₂ concentration was indeed the primary driver of both terrestrial and marine climate: Sea surface temperature and the isotopic makeup of carbon in terrestrial and marine reservoirs responded "instantaneously" (i.e., within 1,000 years) to changes in atmospheric CO₂ content.

They further report that MIS 11 had warm and cool phases that can be detected from sea surface temperature records alone. During the relatively cold phases, sea surface and air temperatures behave coherently and respond to atmospheric CO₂ faster. However, during warmer intervals, ocean surface and air temperatures behave more independently of each other and atmospheric CO₂. The authors suggest that over the course of the next century, air and sea surface temperatures are likely to change in ways that will be difficult to predict.