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Biogeosciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/bgd-6-4587-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
04 May 2009
Review status
This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The revised manuscript was not accepted.
Seasonal pH and aragonite saturation horizons in the Gulf of Alaska during the North Pacific Survey, 1956–1957
S. McKinnell1 and J. R. Christian2,* 1North Pacific Marine Science Organization, c/o Institute of Ocean Sciences, P.O. Box 6000, Sidney, BC, V8L 4B2, Canada
2Fisheries & Oceans Canada, Institute of Ocean Sciences, P.O. Box 6000, Sidney, BC, V8L 4B2, Canada
*also at: Canadian Centre for Climate Modelling and Analysis, University of Victoria, Victoria, BC, V8W 3V6, Canada
Abstract. The extent of global change in carbon system parameters can only be evaluated by comparing present with past measurements. In the northern North Pacific, where aragonite saturation horizons are among the shallowest in the world, historical measurements of carbonate parameters vary from rare to nonexistent. However, during the summer of 1956 and winter of 1957, an extensive survey of the oceanography of the Northeast Pacific, under the auspices of the Canadian Committee on Oceanography, was conducted by the Fisheries Research Board of Canada. Approximately 2500 measurements of pH at depths from surface to 2000 m were taken throughout the Gulf of Alaska, in addition to measurements of nutrient and hydrographic properties. After conversion to the contemporary total pH scale, these data revealed significant seasonal and latitudinal differences in pH in the upper 200 m. Estimates of aragonite saturation indicate that undersaturated water was a common feature of the surface mixed layer north of 51° N latitude in the winter of 1957. The North Pacific Survey data were compared with the results of a summer 2007 survey of the west coast of North America where pH levels were ~0.1 pH units lower (at a reference density of 26.2σθ than was found in the summer of 1956.

Citation: McKinnell, S. and Christian, J. R.: Seasonal pH and aragonite saturation horizons in the Gulf of Alaska during the North Pacific Survey, 1956–1957, Biogeosciences Discuss., https://doi.org/10.5194/bgd-6-4587-2009, 2009.
S. McKinnell and J. R. Christian
S. McKinnell and J. R. Christian

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