Standards to underpin atmospheric monitoring
Following the CCQM, CCQM Working Group on Gas Analysis (GAWG) and CCQM Working Group on Isotope ratios (IRWG) strategies, the BIPM Chemistry Department coordinates comparisons of National Metrology Institute (NMI) gas standard capabilities for the three major greenhouse gases – carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) – in air, as well as isotope ratios of CO2 relevant to source apportionment and the basis of international scales for carbon isotope. The BIPM maintains specialized facilities to run the comparisons, based on procedures using two different analytical techniques to ensure any method bias is detected, and methods operated at optimized minimum uncertainties.
Active comparisons
Active pilot studies
Completed comparisons
Completed pilot studies
Publications