Attributing seasonal pH variability in surface ocean waters to governing factors

M. Hagens; J. J. Middelburg

doi:10.1002/2016gl071719

journal article Open Access Dec 27, 2016

Attributing seasonal pH variability in surface ocean waters to governing factors

M. Hagens J. J. Middelburg

Geophysical Research Letters Vol. 43 No. 24 · American Geophysical Union (AGU)

View at Publisher Save 10.1002/2016gl071719

Abstract

AbstractOn‐going ocean acidification and increasing availability of high‐frequency pH data have stimulated interest to understand seasonal pH dynamics in surface waters. Here we show that it is possible to accurately reproduce observed pH values by combining seasonal changes in temperature (T), dissolved inorganic carbon (DIC), and total alkalinity (TA) from three time series stations with novel pH sensitivity factors. Moreover, we quantify the separate contributions of T, DIC, and TA changes to winter‐to‐summertime differences in pH, which are in the ranges of −0.0334 to −0.1237, 0.0178 to 0.1169, and −0.0063 to 0.0234, respectively. The effects of DIC and temperature are therefore largely compensatory, and are slightly tempered by changes in TA. Whereas temperature principally drives pH seasonality in low‐latitude to midlatitude systems, winter‐to‐summer DIC changes are most important at high latitudes. This work highlights the potential of pH sensitivity factors as a tool for quantifying the driving mechanisms behind pH changes.

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Details

Published: Dec 27, 2016
Vol/Issue: 43(24)
License: View

Authors

M

M. Hagens

Department of Earth Sciences ‐ Geochemistry Utrecht University Utrecht Netherlands

J

J. J. Middelburg

Department of Earth Sciences ‐ Geochemistry Utrecht University Utrecht Netherlands

Funding

National Science Foundation

Cite This Article

M. Hagens, J. J. Middelburg (2016). Attributing seasonal pH variability in surface ocean waters to governing factors. Geophysical Research Letters, 43(24). https://doi.org/10.1002/2016gl071719

Attributing seasonal pH variability in surface ocean waters to governing factors

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