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    Empirical algorithms to estimate water column pH in the Southern Ocean

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    Name:
    Williams_et_al-2016-Geophysica ...
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    Author
    Williams, N. L.
    Juranek, L. W.
    Johnson, K. S.
    Feely, R. A.
    Riser, S. C.
    Talley, L. D.
    Russell, J. L.
    Sarmiento, J. L.
    Wanninkhof, R.
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2016-04-16
    Keywords
    ANTHROPOGENIC CARBON
    SEAWATER
    CO2
    ACIDIFICATION
    ACIDIFICATION
    ALKALINITY
    
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    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Empirical algorithms to estimate water column pH in the Southern Ocean 2016, 43 (7):3415 Geophysical Research Letters
    Journal
    Geophysical Research Letters
    Rights
    ©2016. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Empirical algorithms are developed using high-quality GO-SHIP hydrographic measurements of commonly measured parameters (temperature, salinity, pressure, nitrate, and oxygen) that estimate pH in the Pacific sector of the Southern Ocean. The coefficients of determination, R-2, are 0.98 for pH from nitrate (pH(N)) and 0.97 for pH from oxygen (pH(Ox)) with RMS errors of 0.010 and 0.008, respectively. These algorithms are applied to Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) biogeochemical profiling floats, which include novel sensors (pH, nitrate, oxygen, fluorescence, and backscatter). These algorithms are used to estimate pH on floats with no pH sensors and to validate and adjust pH sensor data from floats with pH sensors. The adjusted float data provide, for the first time, seasonal cycles in surface pH on weekly resolution that range from 0.05 to 0.08 on weekly resolution for the Pacific sector of the Southern Ocean.
    Note
    Embargo "Publisher's version/PDF must be used in Institutional Repository 6 months after publication."
    ISSN
    00948276
    DOI
    10.1002/2016GL068539
    Version
    Final published version
    Sponsors
    The measurement methods, calibration, and quality control for all discrete bottle data used in this study are available at http://cchdo.ucsd.edu, and all SOCCOM float data are available at http://soccom.princeton.edu/soccomviz.php. This work was sponsored by the U.S. National Science Foundation's Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Project under the NSF Award PLR-1425989. Logistical support for this project in Antarctic waters was provided by the U.S. National Science Foundation through the U.S. Antarctic Program. Additionally, we acknowledge support from U.S. Argo through NOAA/JISAO grant NA17RJ1232 to the University of Washington. Nancy Williams is also supported by the ARCS Foundation Portland Chapter. This is PMEL contribution 4417.
    Additional Links
    http://doi.wiley.com/10.1002/2016GL068539
    ae974a485f413a2113503eed53cd6c53
    10.1002/2016GL068539
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