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
2026-08-11-1506 (Last updated: 2026-08-27)File
This data set is submitted by NPL.
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 | 154 |
|---|---|
| Acronym | NPL |
| Name | National Physical Laboratory |
| Address 1 | Hampton Rd |
| Address 2 | Teddington, Middlesex, UK |
| Address 3 | TW11 0LW |
| Country/Territory | United Kingdom of Great Britain and Northern Ireland |
| Website | https://www.npl.co.uk/ |
Contact(s)
| Name | Chris Rennick |
|---|---|
| Prefix | |
| chris.rennick@npl.co.uk | |
| Organization No | 154 |
| Organization acronym | NPL |
| Organization name | National Physical Laboratory |
| Organization country/territory | United Kingdom of Great Britain and Northern Ireland |
| Address 1 | Hampton Rd |
| Address 2 | Teddington, Middlesex, UK |
| Address 3 | TW11 0LW |
| Country/territory | United Kingdom of Great Britain and Northern Ireland |
| Tel | |
| Fax | |
| Last updated date | 2026-08-11 |
| Name | Emmal Safi |
|---|---|
| Prefix | |
| emmal.safi@npl.co.uk | |
| Organization No | 154 |
| Organization acronym | NPL |
| Organization name | National Physical Laboratory |
| Organization country/territory | United Kingdom of Great Britain and Northern Ireland |
| Address 1 | Hampton Rd |
| Address 2 | Teddington, Middlesex, UK |
| Address 3 | TW11 0LW |
| Country/territory | United Kingdom of Great Britain and Northern Ireland |
| Tel | |
| Fax | |
| Last updated date | 2026-08-11 |
| Name | Dafina Kikaj |
|---|---|
| Prefix | |
| dafina.kikaj@npl.co.uk | |
| Organization No | 154 |
| Organization acronym | NPL |
| Organization name | National Physical Laboratory |
| Organization country/territory | United Kingdom of Great Britain and Northern Ireland |
| Address 1 | Hampton Rd |
| Address 2 | Teddington, Middlesex, UK |
| Address 3 | TW11 0LW |
| Country/territory | United Kingdom of Great Britain and Northern Ireland |
| Tel | |
| Fax | |
| Last updated date | 2026-08-11 |
| Name | Edward Chung |
|---|---|
| Prefix | |
| edward.chung@npl.co.uk | |
| Organization No | 154 |
| Organization acronym | NPL |
| Organization name | National Physical Laboratory |
| Organization country/territory | United Kingdom of Great Britain and Northern Ireland |
| Address 1 | Hampton Rd |
| Address 2 | Teddington, Middlesex, UK |
| Address 3 | TW11 0LW |
| Country/territory | United Kingdom of Great Britain and Northern Ireland |
| Tel | |
| Fax | |
| Last updated date | 2026-08-11 |
| Air Pollution monitoring | |
| UTC | |
| permil | |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: VSMOW |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: Boreas preconcentrator Aerodyne TDLAS(Light absorption analysis (IR, except NDIR) ) |
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9999-12-31 00:00:00 - 9999-12-31 23:59:59: 100 (m) |
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| 60 to 90 minutes | |
| Methane isotope ratio and amount fraction from Boreas preconcentrator and laser spectrometer. The time stamp represents the start of an integrated sample of air, collected until the end time stamp, which is subsequently processed and measured by a laser spectrometer in situ. The reported uncertainties are the standard deviation of approximately four samples of a compressed air working standard treated in an identical manner to the air sample. These measurements are taken within 12 hours of the air sample measurement and are also used to correct for short term instrument drift. Full sampling, sample processing, detection and calibration procedures are provided by Rennick et al., 2021 https://doi.org/10.1021/acs.analchem.1c01103. | |
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[Hourly] [Daily] [Monthly] |
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| Operational/Reporting | |
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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: |
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Meteorological data may remain as first provided, even when greenhouse gas data are updated. |
DOI Metadata
| DOI |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Version |
2026-08-11-1506 (Data Version History) * DOIs and file names may have multiple versions. Be sure to check the data version. |
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| Title | Atmospheric CH3D at Heathfield by National Physical Laboratory, dataset published as CH3D_HFD6419_surface-insitu_NPL_data1 at WDCGG | ||||||||||||
| Creator |
National Physical Laboratory Chris Rennick (NPL) Emmal Safi (NPL) Dafina Kikaj (NPL) Edward Chung (NPL) |
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| Publisher | World Data Centre for Greenhouse Gases | ||||||||||||
| Publication Date | 2025-09-10 (Last Updated: 2026-08-27) | ||||||||||||
| Format | Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF | ||||||||||||
| Relation List (Is Part Of) |
All CH3D data contributed to WDCGG by GAW stations and mobiles by 2025-09-10 |
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| Geolocation Point |
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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.
Chris Rennick (NPL),
Emmal Safi (NPL),
Dafina Kikaj (NPL),
Edward Chung (NPL),
Atmospheric CH3D
at Heathfield by National Physical Laboratory,
dataset published as CH3D_HFD6419_surface-insitu_NPL_data1 at WDCGG,
ver. 2026-08-11-1506, https://doi.org/10.50849/WDCGG_0154-6419-1104-01-01-9999 (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 | Rennick, Chris, Tim Arnold, Emmal Safi, et al. 2021. ‘Boreas: A Sample Preparation-Coupled Laser Spectrometer System for Simultaneous High-Precision In Situ Analysis of δ13C and δ2H from Ambient Air Methane’. Analytical Chemistry 93 (29): 10141–51. https://doi.org/10.1021/acs.analchem.1c01103. |
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