Login to WDCGG as


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


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 2020-07-06

 Background observation
 1993-01-01 00:00:00 - 9999-12-31 23:59:59: The gravimetric standard gas of ppt order concentration.
 1991-01-01 00:00:00 - 2005-02-28 23:59:59: Yanaco Ohgi Co., Ltd. AG-1000EN(Gas chromatography (ECD))
 2005-03-01 00:00:00 - 2008-01-31 23:59:59: Shimadzu Corporation GC-14B(Gas chromatography (ECD))
 2008-02-01 00:00:00 - 9999-12-31 23:59:59: Shimadzu Corporation GC-2014(Gas chromatography (ECD))
 1993-01-01 00:00:00 - 9999-12-31 23:59:59: 7 (m)
 The quadratic fitting curve is determined every 8 hours by a set of 3 station working standard gases of CCl4, CH3CCl3-in-nitrogen air mixtures in different concentrations. The mole fraction is determined by this fitting curve.
 The raw data from instrument is collected by the data acquisition system, and stored in the system as every one hour raw data. CH3CCl3 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 raw data are based from observed data for one hour after the irregular and evident error data are rejected.
 [Daily] Daily data are taken from the arithmetic mean of selected hourly data. For the details of background daily data, please refer to https://www.data.jma.go.jp/gmd/env/ghg_obs/JMA_flag.html
 [Monthly] Monthly mean concentrations are calculated from background daily data. For the details of background daily data, please refer to https://www.data.jma.go.jp/gmd/env/ghg_obs/JMA_flag.html
  Daily data
0-2: no background condition
3: background condition
9: missing
Monthly data
2: no valid Daily data
3: valid
9: missing
For the details, please refer to https://www.data.jma.go.jp/gmd/env/ghg_obs/JMA_flag.html
 Sample air is discretely sampled into the analyzer and analyzed every an hour.
 Wind direction:
 Wind speed:
 Relative humidity:
 Precipitation amount:
 Air pressure:
 Air temperature:
 Dew point temperature:
 Sea water temperature:
 Sea surface water temperature:
 Sea water salinity:
 Sea surface water salinity:
Meteorological data may remain as first provded, even when greenhouse gas data are updated.
1  JMA, Observation method of the greenhouse gas http://www.data.jma.go.jp/gmd/env/ghg_obs/en/