Slow acidification of the winter mixed layer in the subarctic western North Pacific Ocean

Masahide Wakita1, Akira Nagano2, Tetsuichi Fujiki2 and Shuichi Watanabe3, (1)JAMSTEC/MIO, Mutsu, Japan, (2)JAMSTEC, Yokosuka, Japan, (3)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan