Data Policy
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."
Version
2026-07-28-0523 (Last updated: 2026-08-13)File
This data set is submitted by JMA.
In line with the GAW Data Policy, users should contact the contributors of all data of interest and propose co-authorship or acknowledgement.
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 | ENYO Kazutaka |
|---|---|
| Prefix | Mr. |
| seadata@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 | +81-3-6758-3900 (ex.4619) |
| Fax | |
| Last updated date | 2026-07-28 |
| Background observation | |
| UTC+09:00 | |
| ppm | |
|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CO2 X2019 |
|
|
1989-11-01 00:00:00 - 1995-06-30 23:59:59: Beckman Industrial, Model 880(NDIR) 1995-07-01 00:00:00 - 1999-12-31 23:59:59: Rosemount GmbH & Co., BINOS 4.1(NDIR) 2000-01-01 00:00:00 - 2010-03-31 23:59:59: Fisher-Rosemount GmbH & Co., MLT 3.1(NDIR) 2010-04-01 00:00:00 - 2013-02-28 23:59:59: LI-COR Biosciences, LI-7000(NDIR) 2013-03-01 00:00:00 - 2013-05-31 23:59:59: Fisher-Rosemount GmbH & Co., MLT 3.1(NDIR) 2013-06-01 00:00:00 - 2023-12-31 23:59:59: LI-COR Biosciences, LI-7000(NDIR) 2024-01-01 00:00:00 - 2025-07-17 23:59:59: Los Gatos Research, GGA-30r(off-axis integrated cavity output spectroscopy (OA-ICOS)) 2025-07-18 00:00:00 - 2025-11-04 23:59:59: ABB Inc. GLA331-GGA(off-axis integrated cavity output spectroscopy (OA-ICOS)) 2025-11-05 00:00:00 - 9999-12-31 23:59:59: Los Gatos Research, GGA-30r(off-axis integrated cavity output spectroscopy (OA-ICOS)) |
|
|
9999-12-31 00:00:00 - 9999-12-31 23:59:59: NA (m) |
|
| event | |
|
Standard gases used: Mixed gas of carbon dioxide and purified natural air Until 2023: Measuring a set of 4 or 5 standard gases with different concentrations, every 1 or 2 hour. A quadratic fitting curve is determined from the result of calibration. The mole fraction of carbon dioxide is determined using the fitting curve. From 2024: Measuring a set of 4 standard gases with different concentrations, every 12-hour. A linear regression line is determined from the result of calibration. The mole fraction of carbon dioxide is determined using the linear regression line. |
|
| Until 1999, the mole fraction was determined using a quadratic equation based on the calibration. The recorded data were hourly data. Hourly data were calculated by averaging sampling data, excluding erroneous data.From 2000, the recorded data are sampling data.From 2024, the mole fraction is determined using a linear equation based on the calibration.Erroneous data are identified by visual inspection and are reported with flag 3. | |
|
[Hourly] [Daily] [Monthly] |
|
|
Flag information 0: Acceptable measurement. 1: Questionable measurement due to significant variation during measurement. 2: Value calculated by extrapolation of the calibration curve. |
|
|
Valid: 0 Valid: 1 Valid: 2 |
|
| Operational/Reporting | |
| The measurements for air and surface sea water are carried out. The height of intake for air sample is about 8 meters above sea surface. The depth of the intake for sea water sample is about 4 meters below sea surface. The tubing for air sample is made of fluorinated ethylene - perfluoroalkoxyethylene copolymer (PFA). The inner diameter, outer diameter of the tubing are 19/64 inches and 3/8 inches, respectively. The length of the tubing is approximately 40 meters. The sea water is introduced into the shower head type equilibrator. Until 2023, both the introduced ambient air and the equilibrated air were dried using an electronic cooling unit, a membrane dryer, and a chemical desiccant (Mg(ClO₄)₂). From 2024, both introduced ambient air and equilibrated air are dried using an electronic cooling unit and a Stirling cooler. | |
|
Wind direction: 1 Wind speed: 1 Relative humidity: 1 Precipitation amount: 0 Air pressure: 1 Air temperature: 1 Dew point temperature: 1 Sea water temperature: 0 Sea surface water temperature: 1 Sea water salinity: 0 Sea surface water salinity: 1 |
|
|
Meteorological data may remain as first provided, even when greenhouse gas data are updated. |
No DOI available
Related information
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.
Please follow the citation format which the data providers or owners indicate.
ENYO Kazutaka (JMA),
Oceanic CO2
by Ryofu Maru, R/V, Japan Meteorological Agency,
dataset published as CO2_RYF8010_ship-insitu_JMA_sea-sampling at WDCGG,
ver. 2026-07-28-0523 (Reference date*: YYYY/MM/DD)
* As the reference date, please indicate the date you downloaded the files.
* As the reference date, please indicate the date you downloaded the files.
Reference(s)
| 1 | Hirota, M., K. Nemoto, A. Murata, K. Fushimi (1991): Observation of Carbon Dioxide Concentrations in Air and Surface Sea Water in the Western North Pacific Ocean. Oceanographical Magazine, 41, 19-28. |
|---|
