|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|
|Organization name||Environment and Climate Change Canada|
|Last updated date||2019-09-30|
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: 60 (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 (see below) 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:
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);
SOFT REJECTION flag.
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).
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): ...
Other Descriptions for Sampling and Analyses: Environment Canada installed an auto flask sampling at the site in 2007. Each week, a pair of flasks has been sampled by pressurizing air into the 2-litre double-valve flasks. To catch the diurnal change, one flask was sampled in the afternoon and one was sampled in the midnight. These samples are taken at the 40-metre level of a surface tower. The document below should be referred for the details of analysis. (http://www.atmos-meas-tech.net/6/1685/2013/amt-6-1685-2013.html)
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.
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||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.|
|2||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|
|3||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.|
|4||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.|