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 Organization

NO 1
Acronym JMA
Name Japan Meteorological Agency
Address 1
Address 2
Address 3 3-6-9 Toranomon, Minato City, Tokyo 105-8431
Country/Territory Japan
Website https://www.jma.go.jp/jma/indexe.html

 Contact(s)

Name SAITO Kazuyuki
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 Atmosphere and Ocean Department
Address 2 Atmospheric Environment and Ocean Division
Address 3 3-6-9 Toranomon, Minato City, Tokyo 105-8431
Country/territory Japan
Tel +81-3-3434-9127
Fax
Last updated date 2021-06-30


 Background observation
 UTC+09:00
 ppb
 1991-01-01 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A
 1991-01-01 00:00:00 - 2008-12-31 23:59:59: HORIBA, Ltd. GA-360S(NDIR)
 2009-01-01 00:00:00 - 9999-12-31 23:59:59: Round Science Inc. RGC-1(Gas chromatography (FID))
 1991-01-01 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. 2009 - 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. 1991 - Dec. 2008).
 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. 1991 - Dec. 2008). 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.
 [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. 2009 - present). Continuous flow of 3.5 liters per minute and data was analyzed every 30 seconds (Jan. 1991 - Dec. 2008).
 Wind direction: 1
 Wind speed: 1
 Relative humidity: 1
 Precipitation amount: 1
 Air pressure: 1
 Air temperature: 1
 Dew point temperature: 1
 Sea water temperature: 0
 Sea surface water temperature: 0
 Sea water salinity: 0
 Sea surface water salinity: 0
Meteorological data may remain as first provided, even when greenhouse gas data are updated.
 

 DOI Metadata

DOI
ch4_ryo_surface-insitu_1_9999-9999_hourly.nc 10.50849/WDCGG_0001-2012-1002-01-01-9999
ch4_ryo_surface-insitu_1_9999-9999_hourly.txt 10.50849/WDCGG_0001-2012-1002-01-01-9999
ch4_ryo_surface-insitu_1_9999-9999_daily.nc 10.50849/WDCGG_0001-2012-1002-01-01-9999
ch4_ryo_surface-insitu_1_9999-9999_daily.txt 10.50849/WDCGG_0001-2012-1002-01-01-9999
ch4_ryo_surface-insitu_1_9999-9999_monthly.nc 10.50849/WDCGG_0001-2012-1002-01-01-9999
ch4_ryo_surface-insitu_1_9999-9999_monthly.txt 10.50849/WDCGG_0001-2012-1002-01-01-9999
ch4_ryo_surface-insitu_1_9999-9999_hourly_met.nc 10.50849/WDCGG_0001-2012-1002-01-01-9999
ch4_ryo_surface-insitu_1_9999-9999_hourly_met.txt 10.50849/WDCGG_0001-2012-1002-01-01-9999
Version 2021-06-30-0147 (Data Version History)
* DOIs and file names may have multiple versions. Be sure to check the data version.
Title Atmospheric CH4 at Ryori by Japan Meteorological Agency, dataset published as CH4_RYO_surface-insitu_JMA_data1 at WDCGG
Creator Japan Meteorological Agency
SAITO Kazuyuki (JMA)
Publisher World Data Centre for Greenhouse Gases
Publication Date 2016-12-20 (Last Updated: 2021-07-15)
Format Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF
Relation List (Is Part Of) All CH4 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28
All CH4 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19
All CH4 data contributed to WDCGG by GAW stations and mobiles by 2018-10-25
Geolocation Point
Latitude (north: +; south: -) 39.0319
Longitude (east: +; west: -) 141.8222

 GAW Data Policy

"For Scientific purposes, access to these data is unlimited and provided without charge. By their use you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."

 Citation format

This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.
SAITO Kazuyuki (JMA), Atmospheric CH4 at Ryori by Japan Meteorological Agency , dataset published as CH4_RYO_ surface-insitu_JMA_data1 at WDCGG, ver. 2021-06-30-0147, https://doi.org/10.50849/WDCGG_0001-2012-1002-01-01-9999 (Reference date*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.

 Reference(s)

1  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
2  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.
3  JMA, Observation method of the greenhouse gas http://www.data.jma.go.jp/gmd/env/ghg_obs/en/