Dating antarctic ice cores emilio estevez who is he dating
However, drilling of the core still continues, and it is expected that, when drilling is completed in a few years time, an age of 500,000 years will have been reached.Starting on the right-hand side of the graph at about 140,000 years ago, the climate was about 6°C colder than it is today. Then at about 130,000 years ago, there was a quite rapid warming period until about 125,000 years ago, when the climate was, perhaps, 1°C or 2°C warmer than today.Figure 1 Scientists measure ice cores from deep drilling sites on the ice sheet near Casey station Photo by M. The annual precipitation of snow, averaged across the continent, is about 30 centimetres, which is equivalent to about 10 centimetres of water.Holmes, 1993 © Copyright Australian Antarctic Division Antarctica is the coldest, windiest, highest and driest continent on Earth. In some locations as little as 2 centimetres (water equivalent) is recorded.Approximately 98 per cent of the Antarctic continent is covered by the ice sheet which is on average about 2,500 metres thick and, at it's deepest location, 4,700 metres thick.It is due to this thick ice mass that Antarctica is, on average, the highest continent.
She has a master's degree in bioengineering from the University of Washington and a graduate certificate in science writing from the University of California Santa Cruz.
As the snow is deposited on top of the ice sheet each year, it traps different chemicals and impurities which are dissolved in the ice.
The ice and impurities hold information about the Earth's environment and climate at the time of deposition.
These short warmer periods are called inter-glacials. From 120,000 to about 20,000 years ago, there was a long period of cooling temperatures, but with some ups and downs of a degree or two.
This was the Wisconsin Period, known as the last Great Ice Age.