Carbon dating in antarctica
Carbon dating in antarctica - azdg dating site ru
The intrigue deepened when biologists realized that at least some of the beasts from Lake Mercer were landlubbers.
You can watch a recording of the meeting and view presentation abstracts here.We're carrying on burning fossil fuels, and carbon dioxide keeps on building up.So far we haven't seen the sea level and temperature rises of the Pliocene, or much in the way of vegetation at the South Pole, but that's the way we're heading – these new findings are another stark warning about our future, as if we needed one."If you put your oven on at home and set it to 200C, the temperature doesn't get to that level immediately," said Martin Siegert from Imperial College London in the UK, who chaired the discussion.How the crustaceans and tardigrade reached Lake Mercer is still a matter of debate.Answers could come as the SALSA team tries to determine the age of the material using carbon dating and attempts to sequence the creatures’ DNA.The crustaceans and a tardigrade, or ‘water bear’ — all smaller than poppy seeds — were found in Subglacial Lake Mercer, a body of water that had lain undisturbed for thousands of years.
Until now, humans had seen the lake only indirectly, through ice-penetrating radar and other remote-sensing techniques.
It will take maybe 300 years or something."Polar regions are the most sensitive to climate change, and show the effects first – it's like an early warning system for our planet.
When it comes to the discovery of South Pole forests, the indications are that when these fossilised leaves were growing, there were no ice sheets in Greenland and west Antarctica.
Summertime temperatures in Antarctica would have been around 5 degrees Celsius (41 degrees Fahrenheit), compared with the -15 to -20 degrees Celsius (5 to -4 degrees Fahrenheit) they are today.
At the current rate of emissions, the researchers suggest, we could be up to 1,000 ppm of CO2 in the atmosphere.
Looking back to the last time Earth's atmosphere had this much carbon dioxide in it, the scene is rather dramatic: there were trees growing at the South Pole, sea levels were up to 20 metres (66 feet) higher, and global temperatures were 3-4°C above what they are today.