Japan Meteorological Agency (JMA)
Methane Reference Gas Intercomparison in the 5th Round

In the 5th round intercomparison, the methane reference gases (Cylinder number: CPB13002, CPB13003) prepared in Japan in 2014 will be circulated in the order of Asia (2014-2016), the South-West Pacific (2018-) and Japan. The measurement results of the methane reference gases are summarized in Table 1.

Table 1. Results of Methane Reference Gas Intercomparison in the 5th Round

Laboratory and Location Date of
Measurement
Cylinder No. CPB13002 Cylinder No. CPB13003 Scale Measu-
rement
Info
Mole
fraction (ppb)
SD
(ppb)
N Mole
fraction (ppb)
SD
(ppb)
N
Asia 2014-2016
JMA
Headquarters, Tokyo
Jul. 2, 2014 1738.0 0.8 10 1897.2 1.0 10 WMO X2004A PDF
KMA
Anmyeon-do, Rep. of Korea
Mar. 16, 2015 1738 0.48 1 1897.26 0.48 1 WMO X2004A PDF
IITM
Pune, India
Jul. 14, 2015 to
Jan. 1, 2016
1738 ** 31.67 4 1874 ** 2.61 5 WMO X2004A PDF
JMA
Headquarters, Tokyo
Nov. 7, 2016 1738.3 1.9 10 1897.7 1.8 10 WMO X2004A PDF
South-West Pacific 2018-
(In planning)
Japan
(In planning)
SD: Standard deviation; N: Number of measurements  
**: Reference value  

Table 2. Information on Participants and their Contact

Participant (WEB Site) Country Information
Indian Institute of Tropical Meteorology (IITM) India Contact
Japan Meteorological Agency (JMA) Japan Contact
Korea Meteorological Administration (KMA) Rep. of Korea Contact


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Last Updated: 2017.11.29
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