Direct observations of basin-wide acidification of the North Pacific Ocean

Details Direct observations of basin-wide acidification of the North Pacific Ocean Direct observations of basin-wide acidification of the North Pacific Ocean

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3702601b&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 2, CiteID L02601

Mathematics

Logic

10

Global Change: Impacts Of Global Change (1225), Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Oceanography: General: Physical And Chemical Properties Of Seawater, Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Carbon Cycling (0428)

Scientific paper

Global ocean acidification is a prominent, inexorable change associated with rising levels of atmospheric CO2. Here we present the first basin-wide direct observations of recently declining pH, along with estimates of anthropogenic and non-anthropogenic contributions to that signal. Along 152°W in the North Pacific Ocean (22-56°N), pH changes between 1991 and 2006 were essentially zero below about 800 m depth. However, in the upper 500 m, significant pH changes, as large as -0.06, were observed. Anthropogenic and non-anthropogenic contributions over the upper 800 m are estimated to be of similar magnitude. In the surface mixed layer (depths to ˜100 m), the extent of pH change is consistent with that expected under conditions of seawater/atmosphere equilibration, with an average rate of change of -0.0017/yr. Future mixed layer changes can be expected to closely mirror changes in atmospheric CO2, with surface seawater pH continuing to fall as atmospheric CO2 rises.

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