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NPL scientists blend synthetic air to measure climate change
Date:2/26/2014

prepared gravimetrically i.e. by weighing the gas in the cylinder - that are traceable to the International System of Units (SI) offers a means of broadening availability. These could overcome the cost and complexity of sampling air under global background conditions which can only be carried out at remote locations.

NPL has developed a solution, producing a synthetic standard which can be used to calibrate carbon dioxide and methane measuring instruments. Rather than sampling air directly, NPL created the sample in the laboratory by carefully blending a mix of gaseous components found in air.

However preparing reference standards synthetically presents a significant challenge. Industrially produced carbon dioxide has a different isotopic distribution to that of atmospheric air, which measurement instruments read differently.

Paul Brewer, Principal Research Scientist at NPL, said: "By using high accuracy gravimetry, we were able to prepare a gas mixture that accurately replicated the natural occurring isotopic carbon dioxide. The samples were tested using NPL's world leading measurement equipment and expertise, which demonstrated that the synthetic standard was comparable with the NOAA standard and suitable for use with the international measurement scale for atmospheric monitoring."

The research has demonstrated that air standards comparable to the WMO scale can be prepared synthetically with an isotopic distribution matching that in the atmosphere. The methods used can be replicated, leading to widespread availability of standards for globally monitoring these two high impact greenhouse gasses. For the international atmospheric monitoring community and for gas companies, this could solve the pressing supply issue.

The project has received widespread support from the atmospheric measurement community. Euan G. Nisbet, Foundation Professor of Earth Sciences at Royal Holloway maintains an Atlantic network of greenhouse gas
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Contact: Alex Cloney
alex.cloney@proofcommunication.com
084-568-01872
National Physical Laboratory
Source:Eurekalert  

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