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 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.
Email 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
 1998-01-01 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A
 1998-01-01 00:00:00 - 2007-12-31 23:59:59: HORIBA, Ltd. GA-360S(NDIR)
 2008-01-01 00:00:00 - 9999-12-31 23:59:59: Round Science Inc. RGC-1(Gas chromatography (FID))
 1998-01-01 00:00:00 - 9999-12-31 23:59:59: 20 (m)
 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. 2008 - 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. 1998 - Dec. 2007).
 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. 1998 - Dec. 2007). CH4 measurements are checked every day from the headquarters through the network every day. All irregular measurements and information are recorded in a log book. Finally, the measurement data are checked and validated by the contributor at the headquarters every month.
 [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
 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
 Operational/Reporting
 Sample air is discretely sampled into the analyzer and analyzed every 10 minutes (Jan. 2008 - present). Continuous flow of 3.5 liters per minute, data was analyzed every 30 seconds (Jan. 1998 - Dec. 2007).
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/