Organization
| NO | 1 |
|---|---|
| Acronym | JMA |
| Name | Japan Meteorological Agency |
| Address 1 | |
| Address 2 | Global Environment and Marine Department |
| Address 3 | 1-3-4 Ote-machi, Chiyoda-ku, Tokyo 100-8122 |
| Country/Territory | Japan |
| Website | https://www.jma.go.jp/jma/indexe.html |
Contact(s)
| Name | Kazuyuki SAITO |
|---|---|
| Prefix | Mr. |
| ghg_obs@met.kishou.go.jp | |
| Organization No | 1 |
| Organization acronym | JMA |
| Organization name | Japan Meteorological Agency |
| Organization country/territory | Japan |
| Address 1 | 1-3-4 Otemachi |
| Address 2 | Chiyoda-ku |
| Address 3 | Tokyo 100-8122 |
| Country/territory | Japan |
| Tel | +81-3-3287-3439 |
| Fax | +81-3-3211-8309 |
| Last updated date | 2019-10-09 |
| Background observation | |
| UTC+09:00 | |
| ppb | |
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1994-01-01 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A |
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1994-01-01 00:00:00 - 2009-12-31 23:59:59: HORIBA, Ltd. GA-360S(NDIR) 2010-01-01 00:00:00 - 9999-12-31 23:59:59: Round Science Inc. RGC-1(Gas chromatography (FID)) |
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1994-01-01 00:00:00 - 9999-12-31 23:59:59: 20 (m) |
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| 10 minutes | |
| The quadratic fitting curve is determined every 8 hours by a set of 4 working standard gases of CH4-in-natural air mixtures in different concentrations. The mole fraction is determined by this fitting curve (Jan. 2010 - present). The linear fitting curve was determined every 12 hours by a set of 2 station working standard gases of CH4-in-natural air mixtures in different concentrations (Jan. 1994 - Dec. 2009). | |
| The raw data from instrument is collected by the data acquisition system, and stored in the system as every 10 minutes raw data (or 30 seconds mean data, Jan. 1994 - Dec. 2009). CH4 measurements are checked at the site by an operator every day. All irregular measurements and information are recorded in a log book. Measurement data are transmitted to the headquarters every month and are checked again there. Finally, the measurement data are checked and validated by the contributor at the headquarters. | |
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[Hourly] Hourly data are taken from the arithmetic mean of observed data for one hour after the irregular and evident error data are rejected. For the details of background hourly data, please refer to https://www.data.jma.go.jp/gmd/env/ghg_obs/JMA_flag.html [Daily] Daily data are taken from the arithmetic mean of background hourly data. For the details of background hourly data, please refer to https://www.data.jma.go.jp/gmd/env/ghg_obs/JMA_flag.html [Monthly] Monthly data are taken from the arithmetic mean of background hourly data. For the details of background hourly data, please refer to https://www.data.jma.go.jp/gmd/env/ghg_obs/JMA_flag.html |
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Hourly data 0-6: no background condition 7: background condition 9: missing Daily and Monthly data 2: no valid hourly data 3: valid 9: missing For the details, please refer to https://www.data.jma.go.jp/gmd/env/ghg_obs/JMA_flag.html |
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| Operational/Reporting | |
| Sampling and Analysis Frequency Sample air is discretely sampled into the analyzer and analyzed every 10 minutes (Jan. 2010 - present). Continuous flow of 3.5 liters per minute, data was analyzed every 30 seconds (Jan. 1994 - Dec. 2009). |
| 1 | Tsutsumi, Y., K. Mori, M. Ikegami, T. Tashiro, K. Tsuboi, (2006) Long-term trends of greenhouse gases in regional and background events observed during 1998-2004 at Yonagunijima located to the east of the Asian continent. Atmospheric Environment, 40, 5868-5879. |
|---|---|
| 2 | Matsueda, H. et al., Methane standard gases for atmospheric measurements at the MRI and JMA and intercomparison experiments, Papers in Meteorology and Geophysics, 54, 91-109, 2004 |
| 3 | JMA, Observation method of the greenhouse gas http://www.data.jma.go.jp/gmd/env/ghg_obs/en/ |
