Category Archives: Paleoclimate

How do CO2 levels relate to ice ages and sea-level?

Core of ancient Antarctic ice
An ice core collected by the DISC (Deep Ice Sheet Coring) drill from the West Antarctic Ice Sheet

In a recent comment, a reader posted a graphic in which CO2 and sea-level rise appear to be correlated throughout the last 700,000 years. Continue reading How do CO2 levels relate to ice ages and sea-level?

How are ice-core data and Mauna Loa atmospheric data made comparable?

 

An ice core extracted from the West Antarctica Ice Sheet
An ice core extracted from the West Antarctica Ice Sheet

Some readers of the Keeling Curve website have asked us about the graphs that show carbon dioxide concentrations since 1700 and over the past 800,000 years, which use a combination of data derived from analysis of the gas contained in ice cores and that obtained from air sampled at Mauna Loa Observatory in Hawaii. Continue reading How are ice-core data and Mauna Loa atmospheric data made comparable?