Recall that over the last 400,000 years, atmospheric CO₂ levels have fluctuated, with the lowest levels occurring during glacial periods and the highest levels occurring during interglacial periods. Why might atmospheric CO₂ levels be lower during glacial periods?

Question

Quizplus · Accepted Answer

During glacial periods, more carbon is stored in ocean reservoirs because cooler temperatures cause increased oceanic mixing and upwelling, bringing carbon-rich deep water to the surface where it can be absorbed by phytoplankton and other organisms. This results in lower atmospheric CO2 levels.

Recall That Over the Last 400,000 Years, Atmospheric CO2 Levels

Recall That Over the Last 400,000 Years, Atmospheric CO₂ Levels