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GAW Report No. 263

Report of the Fifth Methane Reference Gas Inter-comparison Experiment for Japan from 2018 to 2019


Collection(s)
Authors
Published by
Published in
Geneva
Year published
2021
Summary

The WCC-JMA organized six rounds of the CH4 reference gas inter-comparison experiments from 2001 to 2019 to quantify differences among CH4 standard scales implemented at each participating laboratory as well as to monitor the long-term stability of standard gases in Asia and the South-West Pacific. In the 5th round inter-comparison for Japan, two reference gas cylinders were circulated in turn to JMA, JAMSTEC, TU, AIST, NIES, MRI, and JMA from September 2018 to April 2019. The measurement results of JAMSTEC and WCC-JMA have shown a good agreement with differences of less than 0.4 ppb for two cylinders, whereas the differences between other laboratories and WCC-JMA ranged from 0.96 to 3.77 ppb, mainly due to differences of CH4 calibration scales.

Language of publication
English
Number of pages
11 p.
Format
Digital
Material type
Serial title, number
GAW Report No. 263
WMO Programmes
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