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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
 1994-01-01 00:00:00 - 9999-12-31 23:59:59: WMO CO X2014A
 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. TRA-1(Gas chromatography (RGD))
 1994-01-01 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 station working standard gases of CO-in-natural air mixtures in different concentrations. The mole fraction is determined by this fitting curve (Jan. 2010 - present). The linear fitting curve is determined every 12 hours by CO zero gas and a station working standard gas of CO-in-nitrogen mixtures (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). CO 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.
 [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
 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  JMA, Observation method of the greenhouse gas http://www.data.jma.go.jp/gmd/env/ghg_obs/en/