This is interesting ... more details?
Originally posted by Doug Fisher
POSSIBLE NEWS ITEM:
Or just confusion.
So I checked up on the Gamburtsev range and found this little stunner from just a few days ago:
Antarctica Ice Sheet Only 1.4 Million Years Old, Not 34 Million
"Antarctica's ice sheet formed about 32-million years ago but [Tom Jordan of BAS] said that experts now believed the oldest ice was only 1.4-million years old."
Anyone know anything about this claim? Is it possible that BAS means that the ice in that particular area dates back only 1.4 million years because much of the ice there is thawed and refrozen-ice?
The findings, published in the journal Science, confound a traditional view that ice sheets are almost solely formed by snow that lands on top, gets compressed into ice and flows slowly towards the oceans because of gravity.
'We usually think of ice sheets like cakes - one layer at a time added from the top. This is like someone injected a layer of frosting at the bottom - a really thick layer,' Robin Bell, lead author at Columbia University in New York, said.
The scientists said that about 24 per cent of the ice in an area around Dome A, a 13,800ft high plateau the size of California that forms the top of East Antarctica, was formed by re-frozen ice.
'In some places up to half the ice thickness has been added from below,' they wrote of ice above the invisible Gamburtsev Mountain range.
Jordan's statement, or misstatement, is clearly made in general reference to the entire ice sheet. Unless it was quoted out of context. Journalists don't do that. Do they?
The age of the Antarctic ice sheet has dropped by millions in the past, but this would be a phenomenal drop percentage wise. Are we just one find away from the ice sheets being dated in thousands of years?
"Antarctica's ice sheet formed about 32million years ago but Jordan said that experts NOW believed the oldest ice was only 1.4million years old."
Antarctica's ice sheet formed about 32million years ago and Jordan said that experts believed the oldest ice was only 1.4million years old.
"Firstly glacial drop stones found far out in the ocean, which can only have been carried by icebergs. These are dated using the micro-fossils found with them.
Secondly there is a change in the isotopic composition of the oceans recorded in fossil shells, indicating lots of water was locked away in an ice sheet.
Thirdly there was a global drop in sea level, related to storage of a large volume of ice on the continents."