Acceleration of the ocean acidification in the western North Pacific subtropical zone: a rapid response to the CO2 increase in the atmosphere

Masao Ishii1, Hisashi Ono1, Katsuya Toyama1, Naohiro Kosugi1, Daisuke Sasano2, Kazutaka Enyo2, Shinji Masuda2, Atsushi Kojima2, Yosuke Iida2, Yusuke Takatani2, Toshiya Nakano2 and Hisayuki Yoshikawa Inoue3, (1)Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan, (2)Global Environment and Marine Department, Japan Meteorological Agency, Tokyo, Japan, (3)Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan