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Japan
Meteorological Agency (JMA)
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Methane Reference Gas Intercomparison in the 6th Round
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| In the 6th round intercomparison, the methane reference gases (Cylinder number: CPD00241, CPD00242) prepared in Japan in 2017 were circulated in the order of Asia (2018-2019), the South-West Pacific (2021-2022) and Japan (2022). The measurement results of the methane reference gases are summarized in Table 1. |
Table 1. Results of Methane Reference Gas Intercomparison in the 6th Round |
| Laboratory and Location | Date of Measurement |
Cylinder No. CPD00241 | Cylinder No. CPD00242 | Scale | GAW Report |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Mole fraction (ppb) |
SD (ppb) |
U (ppb) |
N | Mole fraction (ppb) |
SD (ppb) |
U (ppb) |
N | ||||
| Asia 2018-2019 | |||||||||||
| JMA Headquarters, Tokyo |
Jan. 10, 2018 | 1776.49 | 0.03 | - | 5 | 1938.19 | 0.05 | - | 5 | WMO X2004A | Link |
| CMA(CRDS) Beijing, China |
Apr. 4, 2018 | 1775.7 | 0.13 | - | 3 | 1938.3 | 0.06 | - | 3 | WMO X2004A | |
| CMA(GC/FID) Beijing, China |
Apr. 9, 2018 | 1775.1 | 0.2 | - | 4 | 1937.7 | 0.3 | - | 4 | WMO X2004A | |
| KMA/NIMS Anmyeon-do, Rep. of Korea |
Jul. 25, 2018 | 1776.23 | 0.196 | - | 120 | 1938.3 | 0.189 | - | 120 | WMO X2004A | |
| IITM Pune, India |
Oct. 8, 2018 | 1779.85 | 0.50 | - | 61 | 1941.01 | 0.49 | - | 61 | WMO X2004A | |
| JMA Headquarters, Tokyo |
Sep. 30, 2019 | 1776.67 | 0.08 | - | 5 | 1938.31 | 0.06 | - | 5 | WMO X2004A | |
| South-West Pacific 2020-2022 | |||||||||||
| JMA Headquarters, Tokyo |
Oct. 28, 2020 | 1775.89 | 0.08 | 0.09 | 5 | 1938.10 | 0.09 | 0.09 | 5 | WMO X2004A | Link |
| CSIRO Aspendale, Australia |
Feb. 24, 2021 to Mar. 18, 2021 |
1776.54 | 2.37 | 0.29 | 127 | 1938.29 | 2.60 | 0.23 | 134 | WMO X2004A | |
| NIWA(CRDS) Wellington, New Zealand |
Jun. 10, 2021 | 1775.87 | 0.20 | 0.08 | 27 | 1937.72 | 0.36 | 0.08 | 39 | WMO X2004A | |
| NIWA(GC/FID) Wellington, New Zealand |
Jun. 30, 2021 | 1775.63 | 1.10 | 0.40 | 30 | 1938.54 | 1.36 | 0.40 | 29 | WMO X2004A | |
| NOAA/ESRL Boulder, U.S.A. |
Sep. 29, 2021 to Oct. 20, 2021 |
1775.77 | 0.11 | 0.1 | 3 | 1938.14 | 0.07 | 0.1 | 3 | WMO X2004A | |
| JMA Headquarters, Tokyo |
Jan. 05, 2022 | 1775.92 | 0.03 | 0.09 | 5 | 1938.13 | 0.03 | 0.09 | 5 | WMO X2004A | |
| Japan 2022 (to be updated) | |||||||||||
| JMA Headquarters, Tokyo |
- | - | - | - | - | - | - | - | - | WMO X2004A | - |
| MRI Tsukuba, Japan |
- | - | - | - | - | - | - | - | - | MRI scale | - |
| AIST Tsukuba, Japan |
- | - | - | - | - | - | - | - | - | AIST scale | - |
| NIES Tsukuba, Japan |
- | - | - | - | - | - | - | - | - | NIES 94 CH4 scale | - |
| TU Sendai, Japan |
- | - | - | - | - | - | - | - | - | TU 1987 scale | - |
| NiPR Tokyo, Japan |
- | - | - | - | - | - | - | - | - | AIST scale | - |
| JMA Headquarters, Tokyo |
- | - | - | - | - | - | - | - | - | WMO X2004A | - |
| SD: Standard deviation; N: Number of measurements; U: Measurement uncertainty | ||
Table 2. Information on Participants |
| Participant (WEB Site) | Country |
| Japan Meteorological Agency (JMA) | Japan |
| China Meteorological Administration (CMA) | China |
| Korea Meteorological Administration (KMA) | Rep. of Korea |
| Indian Institute of Tropical Meteorology (IITM) | India |
| Commonwealth Scientific and Industrial Research Organisation (CSIRO) | Australia |
| National Institute of Water & Atmospheric Research Ltd. (NIWA) | New Zealand |
| National Oceanic and Atmospheric Administration/Earth System Research Laboratory (NOAA/ESRL) | U.S.A. |
| Japan Agency for Marine-Earth Science and Technology (JAMSTEC) | Japan |
| Tohoku University (TU) | Japan |
| National Institute of Advanced Industrial Science and Technology (AIST) | Japan |
| National Institute for Environmental Studies (NIES) | Japan |
| Meteorological Research Institute (MRI) | Japan |