Carbon dating in antarctica best online dating profile taglines
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.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.Unlike carbon-14, however, Krypton is a Noble gas that does not interact chemically and is much more stable with a half-life of around 230,000 years, Buizert pointed out.Development of the ATTA-3 instrument was funded, in part, by the Division of Earth Sciences in NSF's Geosciences Directorate.In their experiment at Taylor Glacier in Antarctica, the researchers put several 300-kilogram (about 660 pounds) chunks of ice into a container and melted it to release the air from the bubbles, which was then stored in flasks.That’s the first time it’s passed that level in 4 million years (no, that’s not a typo).
Krypton is produced by cosmic rays bombarding the Earth and then stored in air bubbles trapped within Antarctic ice.
Most carbon pollution originates in the northern hemisphere because that’s where most of the world’s population lives.
That’s in part why carbon dioxide in the atmosphere hit the 400 ppm milestone earlier in the northern reaches of the world.
The new technique provides an accurate means of confirming the age of ice samples, and researchers note it is now the most precise dating tool for ancient ice.
"The oldest ice found in drilled cores is around 800,000 years old and with this new technique we think we can look in other regions and successfully date polar ice back as far as 1.5 million years," said Christo Buizert, a postdoctoral researcher at Oregon State University and lead author on the PNAS article. Through Polar Programs, NSF manages the United States Antarctic Program, which coordinates all U. research on the southernmost continent and the logistical support for the science.