Long-term continuous atmospheric CO₂ measurements at Baring Head, New Zealand

We present descriptions of the in situ instrumentation, calibration procedures, intercomparison efforts, and data filtering methods used in a 39-yr record of continuous atmospheric carbon dioxide (CO2) observations made at Baring Head, New Zealand. Located on the southern coast of the North Island, Baring Head is exposed to extended periods of strong air flow from the south with minimal terrestrial influence resulting in low CO2 variability. The site is therefore well suited for sampling air masses that are representative of the Southern Ocean region. Instrumental precision is better than 0.015 ppm (1-σ) on 1-Hz values. Comparisons to over 600 co-located flask samples, as well as laboratory based flask and cylinder comparison exercises, suggest that over recent decades compatibility with respect to the Scripps Institution of Oceanography (SIO) and World Meteorological Organisation (WMO) CO2 scales has been 0.3 ppm or better.

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Copyright Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License
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Author Brailsford, G.
Stephens, Britton
Gomez, A.
Riedel, K.
Mikaloff Fletcher, S.
Nichol, S.
Manning, M.
Publisher UCAR/NCAR - Library
Publication Date 2012-12-21T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:56:06.734340
Metadata Record Identifier edu.ucar.opensky::articles:14356
Metadata Language eng; USA
Suggested Citation Brailsford, G., Stephens, Britton, Gomez, A., Riedel, K., Mikaloff Fletcher, S., Nichol, S., Manning, M.. (2012). Long-term continuous atmospheric CO₂ measurements at Baring Head, New Zealand. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7445ngs. Accessed 23 July 2025.

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