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NO 20
Acronym ECCC
Name Environment and Climate Change Canada
Address 1 Environment and Climate Change Canada
Address 2 Climate Research Division
Address 3 4905 Dufferin Street, Toronto, Ontario CANADA M3H 5T4
Country/Territory Canada


Name Lin Huang
Prefix Dr.
Email lin.huang@canada.ca
Organization No 20
Organization acronym ECCC
Organization name Environment and Climate Change Canada
Organization country/territory Canada
Address 1
Address 2
Address 3
Country/territory Canada
Tel (416) 739-5821
Fax (416) 739-4106
Last updated date 2021-04-30

 Background observation
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: VPDB-CO2
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: Thermo Finnigan MAT252(Mass spectrometry)
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: 10 (m)
 1). Each analysis is carried out by extracting CO2 from a 2L flask sample, followed by a flaming seal in an ampoule and then measured its isotopic composition relative to CO2 gas in a reference bellow by the IRMS(MAT252), at the same time, the primary anchor is also measured as the sample;
2). Each sample is linked to VPDB-CO2 scale via the primary anchor. The isotope ratios are reported in unit of per mil
Where: δ18O = [(18O/16Osamp/ (18O/16Ostd/)-1] x 1000 ‰
Measurement precision of IRMS is 0.01 per mil;
3). The overall uncertainty (in terms of accuracy and precision) of individual samples in δ18O is 0.04 permil.
 17O correction is done using Allison/Craig correction
 Three-Column quality control flags:
a NOAA 3-column quality control flag has been adopted where each column is defined as follows:

[column 1]
Hard REJECTION flag.
*.. The sample doesn't have a pair;
+.. high member of the bad pair (pair rejection criteria: 0.05 permil for δ13C and 0.15 permil for δ18O);
-.. low member of the bad pair (pair rejection criteria: 0.05 permil for δ13C and 0.15 permil for δ18O);

[column 2]
A star other than a period (.) in the SECOND column indicates a sample that is likely valid but does not meet selection criteria determined by the goals of a particular investigation (e.g., the sample may not represent the background condition).

[column 3]
An alphanumeric other than a period (.) in the THIRD column provides additional information about the collection or analysis of the sample (e.g., ""..I"" indicates an ICP sample which have been measured by more than one lab).

If both the first and second column contain a period (e.g., ""..."" and ""..I""), the sample is RETAINED.
 Valid (background): ...
 Valid: *..
 Valid: .*.
 Invalid: +..
 Invalid: -..
 Scale and Calibration (traceability)
1) The internationally accepted scale for reporting δ18O is VPDB-CO2 (Vienna Pee Dee Bellemnite);
2). The primary anchor to the VPDB-CO2 scale for CO2 isotope measurements is the pure CO2 evolved from a carbonate (i.e., Cal2) reference materials;
3). Annual calibration is conducted via measuring the primary anchor together with the international reference materials NBS19 and NBS18 (linked to VPDB-CO2). The detailed information for calibration and traceability of the measurements can be found in the reference (http://www.atmos-meas-tech.net/6/1685/2013/amt-6-1685-2013.html).
4). The overall uncertainty (in terms of accuracy and precision) of individual reference materials in δ18O is 0.04 permil.
 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 provided, even when greenhouse gas data are updated.

 DOI Metadata

c18o2_alt_surface-flask_20_9999-9999_event.nc 10.50849/WDCGG_0020-4001-1103-01-02-9999
c18o2_alt_surface-flask_20_9999-9999_event.txt 10.50849/WDCGG_0020-4001-1103-01-02-9999
Version 2021-04-30-1104 (Data Version History)
* DOIs and file names may have multiple versions. Be sure to check the data version.
Title Atmospheric C18O2 at Alert by Environment and Climate Change Canada, dataset published as C18O2_ALT_surface-flask_ECCC_data1 at WDCGG
Creator Environment and Climate Change Canada
Lin Huang (ECCC)
Publisher World Data Centre for Greenhouse Gases
Publication Date 2018-06-08 (Last Updated: 2021-04-30)
Format Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF
Relation List (Is Part Of) All C18O2 data contributed to WDCGG by GAW stations and mobiles by 2020-09-14
All C18O2 data contributed to WDCGG by GAW stations and mobiles by 2019-09-19
All C18O2 data contributed to WDCGG by GAW stations and mobiles by 2018-10-18
Geolocation Point
Latitude (north: +; south: -) 82.4991455078
Longitude (east: +; west: -) -62.3415260315

 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.
Lin Huang (ECCC), Atmospheric C18O2 at Alert by Environment and Climate Change Canada , dataset published as C18O2_ALT_ surface-flask_ECCC_data1 at WDCGG, ver. 2021-04-30-1104, https://doi.org/10.50849/WDCGG_0020-4001-1103-01-02-9999 (Reference date*: YYYY/MM/DD)

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


1  Brand, Willi A., L. Huang, H. Mukai, A. Chivulescu, Ju¨rgen M. Richter & Michael Rothe (2009) How well do we know VPDB? Variability of δ13C and δ18O in CO2 generated from NBS19-calcite, Rapid Commun. Mass Spectrom. 2009; 23: 915-926.
2  R L Langenfelds, P B Krummel, C E Allison, R J Francey, L P Steele and L N Cooper (CSIRO, Australia), D. Worthy, L. Huang, D. Ernst and A. Chivulescu (MSC), Intercomparison of MSC and CSIRO trace gas data from Alert and Estevan Point. Canadian Baseline Report Summary of progress to 2002, 67-76.
3  Huang, L., A. Chivulescu, D. Ernst, W. Zhang, A.-L. Norman, Y.-S. Lee (2013) Maintaining Consistent traceability in High Precision Isotope Measurements in CO2: a way to verify long-term Atmospheric trends of δ13C and δ18O, Atmos. Meas. Tech., 6, 1685-1075, 2013/ www.atmos-meas-tech.net/6/1685/2013/ doi:10.5194/amt-6-1685-2013.
4  Huang L.,, A. Chivulescu, C. Allison, G. Brailsford, W. A. Brand, M. Wendeberg, A. Bollenbacher, R. Keeling, I. Levin, M. Sabasc6, M. Leuenberger, H. Mukai, T. Nakazawa, S. Aoki, R. Neubert, A. Aerts-Bijma, M. Verkouteren, J. White, B. Vaughn, S. Michel, L. Zhou, L.X. Liu (2011) A Report of δ13C & δ18O Measurements in NBS19 and NBS18 pure CO2: Uncertainty in Traceability of CO2 Isotope Measurements, In the proceeding of Report to the 15thWMO/IAEA CO2 Expert Meeting, Jena, Sept. 2009. WMO Report
5  Huang, L. and D. Worthy (2005) Flask Sampling Strategy by MSC for Atmospheric Observations of Greenhouse Gases and CO2 Isotopes over Canada: Status & Plan, Report of the 12th WMO/IAEA Meeting of Experts on CO2 Concentration and Related Tracer Measurement Techniques, Toronto, Sept. 2003, GAW publication 161, 94-100., May, 2005.