The updated ocean acidification indicator shows there has
been a decrease in the pH of Aotearoa New Zealand’s
subantarctic surface waters as they have become more acidic,
Stats NZ said today.
Between 1998 and 2020, ocean
acidity in Aotearoa New Zealand’s subantarctic surface
waters increased 8.6 percent corresponding to a pH decrease
from 8.092 to 8.057. Because the pH scale is logarithmic,
small changes in pH represent large changes in acidity.
Changes in pH in the open ocean are primarily influenced by
absorption of atmospheric carbon dioxide by
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