Japan Meteorological Agency (JMA)
Methane Reference Gas Intercomparison in the 2nd Round

In the 2nd round intercomparison, the methane reference gases (Cylinder number: CPB31288, CPB31289) prepared in Japan in 2005 were circulated between 2005 and 2009 in the order of Asia, the South-West Pacific 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 2nd Round

Laboratory and Location Date of
Measurement
Cylinder No. CPB31289 Cylinder No. CPB31288 Scale Measu-
rement
Info
Mole
fraction (ppb)
SD
(ppb)
N Mole
fraction (ppb)
SD
(ppb)
N
Asia 2005-2006
JMA
Headquarters, Tokyo
Jul. 6-7, 2005 1695.3 ** 1.6 10 1874.2 ** 1.8 10 NOAA04 PDF
CMA
CGAWBO at Mt. Waliguan
Feb. 2006 1670.1 1.9 103 1845.4 2.3 167 AES PDF
KMA
KGAWO at Anmyeon-do
Apr. 18-27, 2006 1695.8 1.5 70 1872.7 1.4 80 KRISS PDF
KRISS, Daejeon Jun. 26-30, 2006 1698.3 1.2 9 1877.1 0.9 8 KRISS PDF
JMA
Headquarters, Tokyo
Aug. 21-22, 2006 1695.9 ** 1.1 10 1874.9 ** 0.7 9 NOAA04 PDF
South-West Pacific 2006-2008
JMA
Headquarters, Tokyo
Dec. 25-26, 2006 1695.6 1.0 10 1875.5 1.2 10 NOAA04 PDF
CSIRO
Aspendale, Australia
Jan. 31-Mar. 28,
2007
1695.0 0.8 68 1875.7 0.8 80 NOAA04 PDF
NIWA
Wellington, New Zealand
Mar. 12, 2008 1692.54 1.88 10 1874.31 1.87 10 NOAA04 PDF
JMA
Headquarters, Tokyo
Aug. 18-19, 2008 1696.2 1.6 10 1875.3 1.8 10 NOAA04 PDF
Japan 2009-2010
JMA
Headquarters, Tokyo
Jun. 17-18, 2009 1697.1 1.6 10 1874.8 1.8 10 NOAA04 PDF
NIES, Tsukuba Oct. 4-6, 2009 1697.3 0.8 36 1877.9 0.5 36 NIES94 PDF
TU, Sendai Nov. 9 -Dec. 4,
2009
1697.1 1.3 42 1877.2 1.2 42 TU Gravimetric Scale PDF
JMA
Headquarters, Tokyo
Jan. 28-29, 2010 1695.1 1.0 10 1875.4 1.1 10 NOAA04 PDF
SD: Standard deviation; N: Number of measurements  
 Note: ** means that JMA made a recalculation for the adoption of the NOAA04 CH4 scale in October 2006.

AES - Atmospheric Environment Service (presently Meteorological Service of Canada (MSC))
CGAWBO - China Global Atmosphere Watch Baseline Observatory
KGAWO - Korea Global Atmosphere Watch Observatory
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
Korea Research Institute of Standards and Science (KRISS) 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 Institute for Environmental Studies (NIES) Japan Contact
Tohoku University (TU) Japan Contact


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Last Updated: 2013.03.27
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