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

  title={Direct observations of basin‐wide acidification of the North Pacific Ocean},
  author={Robert H. Byrne and Sabine Mecking and Richard A. Feely and Xuewu Liu},
  journal={Geophysical Research Letters},
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… 

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