Carbon dating in antarctica
Tans said it's "practically impossible" for the South Pole Observatory to see readings dip below 400 ppm because the Antarctic lacks a strong carbon dioxide up and down seasonal cycle compared to locations in the mid-latitudes.Even factoring in that seasonal cycle, new research published earlier this week shows that the planet as a whole has likely crossed the 400 ppm threshold permanently (at least in our lifetimes).
The use of a radiometric-Krypton-dating technique on ice from Antarctica's Taylor Glacier was documented in a paper published this week in the .
sea levels rise about a foot in the past 120 years and temperatures go up about 1.8°F (1°C) globally.
Arctic sea ice has dwindled 13.4 percent per decade since the 1970s, extreme heat has become more common and oceans are headed for their most acidic levels in millions of years.
Collectively, the world passed the threshold for a month last year.
In the remote reaches of Antarctica, the South Pole Observatory carbon dioxide observing station cleared 400 ppm on May 23, according to an announcement from the National Oceanic and Atmospheric Administration on Wednesday.
That is one reason we are so anxious to find ice that will take us back further in time so we can further extend data on past carbon dioxide levels and test this hypothesis."Krypton dating is much like the more-heralded carbon-14 dating technique that measures the decay of a radioactive isotope--which has constant and well-known decay rates--and compares it to a stable isotope.