Japan Meteorological Agency (JMA)
Methane Reference Gas Intercomparison in the 1st Round

In the 1st round intercomparison, the methane reference gases (Cylinder number: CPB13002, CPB13003) prepared in Japan in 2000 were circulated between 2001 and 2005 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 1st 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 2001
JMA
Headquarters, Tokyo
Apr. 24-25, 2001 1809.7 *, ** 1.1 10 1960.1 *, ** 0.9 10 NOAA04 PDF
CMA
CGAWBO at Mt. Waliguan
Jul. 21-24, 2001 1822.9 11.7 99 1980.5 9.8 99 AES PDF
KMA
KGAWO at Anmyeon-do
Sep. 3-5, 2001 1786.4 1.1 45 1935.7 1.4 45 CMDL PDF
JMA
Headquarters, Tokyo
Nov. 5-6, 2001 1810.8 *, ** 1.6 10 1959.8 *, ** 1.3 10 NOAA04 PDF
South-West Pacific 2002-2003
JMA
Headquarters, Tokyo
Apr. 15-16, 2002 1810.3 *, ** 1.3 10 1959.8 *, ** 1.1 10 NOAA04 PDF
CSIRO
Aspendale, Australia
Mar. 2003 1787.38 2.0 67 1937.33 2.1 72 CSIRO1994 PDF
NIWA
Wellington, New Zealand
Jul. 2003 1817.84 1.79 10 1968.95 2.23 10 NIST PDF
JMA
Headquarters, Tokyo
Dec. 15-16, 2003 1810.6 *, ** 0.8 10 1959.3 *, ** 1.7 10 NOAA04 PDF
Japan 2004-2005
TU, Sendai Sep. 28, 2004 1810.5 1.7 11 1961.2 1.6 11 TU Gravimetric Scale PDF
NIES, Tsukuba Dec. 20, 2004-
Feb. 14, 2005
1812.1 1.4 84 1963.4 1.0 82 NIES94 PDF
JMA
Headquarters, Tokyo
Mar. 3-8, 2005 1809.7 ** 1.9 10 1960.3 ** 1.7 10 NOAA04 PDF
SD: Standard deviation; N: Number of measurements  
 Note:  * means that JMA made a recalculation for the drift in JMA's ex-primary standards in November 2005.
** 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
CMDL - Climate Monitoring and Diagnostics Laboratory (presently Global Monitoring Division (NOAA/ESRL)), U.S.A.
KGAWO - Korea Global Atmosphere Watch Observatory
NIST - National Institute of Standards and Technology, U.S.A.
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
Tohoku University (TU) Japan Contact
National Institute for Environmental Studies (NIES) Japan Contact


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Last Updated: 2013.03.27
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