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Empirical algorithms to estimate water column pH in the Southern Ocean

Author(s): Williams, Nancy L; Juranek, Lauren W; Johnson, Kenneth S; Feely, Richard A; Riser, Stephen C; et al

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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, R2, are 0.98 for pH from nitrate (pHN) and 0.97 for pH from oxygen (pHOx) 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.
Publication Date: 28-Mar-2016
Citation: Williams, Nancy L., Lauren W. Juranek, Kenneth S. Johnson, Richard A. Feely, Stephen C. Riser, Lynne D. Talley, Joellen L. Russell, Jorge L. Sarmiento, and Rik Wanninkhof. "Empirical algorithms to estimate water column pH in the Southern Ocean." Geophysical Research Letters 43, no. 7 (2016): 3415-3422. doi:10.1002/2016GL068539.
DOI: doi:10.1002/2016GL068539
ISSN: 0094-8276
EISSN: 1944-8007
Pages: 3415 - 3422
Type of Material: Journal Article
Journal/Proceeding Title: Geophysical Research Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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