Dating antarctic ice cores

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It has previously been documented that the layers present need not be annual as uniformitarians assume. then the problem is not missing core or other “block” data loss.Rather, the GRIP core lacks about half the annual layers throughout this interval, or the GISP2 ice contains many subannual structures which mimic annual bands, or the layers are in fact annual but one of the counts is erroneous.’ Clearly, since the layers are not always annual, the alleged 14,500-year chronologies derived from the GRIP ice cores are only partly based on the actual counting of layers.

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Current polar records show an intimate connection between atmospheric carbon dioxide and temperature in the natural world.“The idea that there was a lag of CO2 behind temperature is something climate change skeptics pick on,” says Edward Brook of Oregon State University’s College of Earth, Ocean and Atmospheric Sciences.“They say, ‘How could CO2 levels affect global temperature when you are telling me the temperature changed first?’” Frédéric Parrenin of the Laboratory of Glaciology and Geophysical Environment in France and a team of researchers may have found an answer to the question.by John Woodmorappe A profusion of (usually) visually distinctive layers is visible in the ice cores due to different composition, crystal structure and colouring of the ice.

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