Global Ocean pH and the Pacific Decadal Oscillation
The ocean thermal oscillations captured by the Pacific Decadal Oscillation (PDO) [1, 2] have a new parameter to share their gyrations with. Or at least it seems that way from my initial perspective. Here is a preliminary chart comparing the time series of global ocean mean pelagic pH that I developed in  and the PDO index (as archived at http://jisao.washington.edu/pdo/PDO.latest).
It looks like a candidate trend of potential value. Given that the PDO, somewhat like Henry’s Law, relates to both temperature and pressure, maybe this is a quite natural outcome.
1. Zhang, Y., J.M. Wallace, D.S. Battisti, 1997: ENSO-like interdecadal variability: 1900-93. J. Climate, 10, 1004-1020
2. Mantua, N.J. and S.R. Hare, Y. Zhang, J.M. Wallace, and R.C. Francis,1997: A Pacific interdecadal climate oscillation with impacts on salmon production. Bulletin of the American Meteorological Society, 78, pp. 1069-1079
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