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,...

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Bibliographic Details
Published in:Atmospheric Measurement Techniques
Other Authors: Brailsford, G. (author), Stephens, Britton (author), Gomez, A. (author), Riedel, K. (author), Mikaloff Fletcher, S. (author), Nichol, S. (author), Manning, M. (author)
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2012
Subjects:
New Zealand
Scripps
Southern Ocean
Online Access:http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-021-106
https://doi.org/10.5194/amt-5-3109-2012
Description
Summary: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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