Start Carbon dating and polution

Carbon dating and polution

There is a significant number of new studies on long-term air pollution exposure, covering a wider geographic area, including Asia.

We identified studies through a search in the databases Medline and Scopus and previous reviews until January 2013 and performed a meta-analysis if more than five studies were available for the same exposure metric.

In the radiocarbon dating technique, researchers burn the sample and convert the carbon dioxide given off by combustion to graphite.

They use a huge machine, the accelerator mass spectrometer, to measure how much radioactive carbon, or carbon 14, is present in the graphite sample.

The report, published in the journal Nature Geoscience, found that over the past half century the average "airborne fraction" of carbon remaining in the atmosphere had probably increased from 40 to 45 per cent because the oceans were less able to absorb the greenhouse gas.


 
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02-Oct-2019 17:47