Japan Meteorological Agency (JMA)
Methane Reference Gas Intercomparison in the 4th Round

In the 4th round intercomparison, the methane reference gases (Cylinder number: CPB31288, CPB31289) prepared in Japan in 2011 were circulated in the order of Asia (2011-2012), the South-West Pacific (2013-2014) and Japan (2015-2016). The measurement results of the methane reference gases are summarized in Table 1.

Table 1. Results of Methane Reference Gas Intercomparison in the 4th Round

Laboratory and Location Date of
Measurement
Cylinder No. CPB31288 Cylinder No. CPB31289 Scale Measu-
rement
Info
Mole
fraction (ppb)
SD
(ppb)
N Mole
fraction (ppb)
SD
(ppb)
N
Asia 2011-2012
JMA
Headquarters, Tokyo
Jun. 8-9, 2011 1740.5 1.6 10 1878.1 1.5 10 NOAA04 PDF
CMA
CGAWBO at Mt. Waliguan
Sep. 13, 2011 1741.2 0.9 3 1878.7 0.4 3 NOAA04 PDF
Sep. 20, 2011 1740.6 0.1 4 1879.0 0.1 4 NOAA04 PDF
CMA
CAMS, CMA, Beijing
Oct. 14-17, 2011 1740.0 1.1 14 1879.1 0.5 17 NOAA04 PDF
Oct. 20, 2011 1739.6 0.1 11 1878.8 0.1 11 NOAA04 PDF
KMA
KGAWC, Korea
Dec. 1, 2011 -
Jan. 27, 2012
1739.2 0.88 10 1878.1 0.84 10 NOAA04 PDF
JMA
Headquarters, Tokyo
Mar. 21-22, 2012 1740.2 0.9 10 1878.2 1.0 10 NOAA04 PDF
South-West Pacific 2013-2014
JMA
Headquarters, Tokyo
Jun. 25, 2013 1738.3 1.0 10 1878.0 1.6 10 NOAA04 PDF
CSIRO
Aspendale, Australia
Aug. 15-16,
20-21, 27-28,
2013
1738.2 0.5 107 1878.7 0.5 128 NOAA04 PDF
NIWA
Wellington, New Zealand
Oct. 10,14, 2013 1738.9 1.2 20 1878.3 1.4 20 NOAA04 PDF
NOAA/ESRL
Boulder, U.S.A.
Jan. 21 -
Feb. 10, 2014
1740.0 0.7 5 1879.7 1.0 5 NOAA04 PDF
JMA
Headquarters, Tokyo
Apr. 8, 2014 1738.1 1.6 10 1877.9 1.2 10 NOAA04 PDF
Japan 2015-2016
JMA
Headquarters, Tokyo
Dec. 9, 2015 1738.1 1.4 10 1877.7 1.7 10 WMO X2004A PDF
MRI
Tsukuba, Japan
Feb.12, 2016 1739.5 0.1 3 1880.5 0.09 3 MRI PDF
AIST
Tsukuba, Japan
Apr. 2-9, 2016 1741.1 1.84 40 1880.9 1.65 39 AIST PDF
NIES
Tsukuba, Japan
May 18-19, 2016 1742.0 0.1 24 1882.4 0.2 24 NIES94 PDF
JMA
Headquarters, Tokyo
Aug. 15, 2016 1738.1 1.5 10 1876.9 1.6 10 WMO X2004A PDF
SD: Standard deviation; N: Number of measurements  
CGAWBO - China Global Atmosphere Watch Baseline Observatory
CAMS - Chinese Academy of Meteorological Science
KGAWC - Korea Global Atmosphere Watch Center
NOAA - National Oceanic and Atmospheric Administration, U.S.A.

Table 2. Information on Participants and their Contact

Participant (WEB Site) Country Information
Japan Meteorological Agency (JMA) Japan Contact
China Meteorological Administration (CMA) China Contact
Korea Meteorological Administration (KMA) Rep. of Korea Contact
Commonwealth Scientific and Industrial Research Organisation (CSIRO) Australia Contact
National Institute of Water & Atmospheric Research Ltd. (NIWA) New Zealand Contact
National Oceanic and Atmospheric Administration/Earth System Research Laboratory (NOAA/ESRL) U.S.A. Contact
Meteorological Research Institute (MRI) Japan Contact
National Institute of Advanced Industrial Science and Technology (AIST) Japan Contact
National Institute for Environmental Studies (NIES) Japan Contact


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Last Updated: 2017.11.29
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