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Links are also provided to shorter records from other Antarctic locations.

The 2000-year record from Law Dome, Antarctica, has been merged with modern records and a spline function was fit to the result to provide a 2000-year time series extending to the present These records are maintained by the World Data Center for Paleoclimatology, National Oceanic and Atmospheric Administration (NOAA), and have graciously been made freely available for access and distribution.

Luckily, clues to past climatic conditions, dating hundreds of thousands of years back in time, are recorded in glacial ice all over the world.

Paleoclimatologists (scientists who study past climate) make inferences based on indirect measures of proxy dataproxy data: data that paleoclimatologists gather from natural recorders of climate variability, e.g., tree rings, ice cores, fossil pollen, ocean sediments, coral and historical data, that can help extend our understanding of climate far beyond the 140 year instrumental record.biological, geological, or chemical indicators that reflect climate conditions.

The sample container is connected to a cold trap for several minutes to release air from the clathrates and the air is then expanded to a measuring cell where a laser measures absorption in a vibration–rotation transition line of the CO-in-air standard gas of 251.65 parts per million by volume (ppmv) scaled on the WMO mole fraction scale.