Fig. 5

Time series of potential temperature (a), salinity (b), DO (c), AOU (d), PO₄ (e), silicate (f), NO₃ (g), and DIC (h) in the Sanriku area (circles) and along the P10 section (green triangles) on the studied isopycnal surfaces (27.38σ_θ: red; 27.56σ_θ: blue). Open and closed symbols show values before and after the 2011 Tohoku Earthquake (3.11), respectively. In panels (a–d), thin orange lines denote values measured at the deep-sea station off Otsuchi Bay (Fig. 1a). Dashed and bold lines refer to mean values before and after the 2011 Tohoku Earthquake, respectively. Error bars are standard deviations for 2005, 2012, and 2014 along the P10 section, respectively. Right red (left blue) axes of DO (c), AOU (d), PO₄ (e), and NO₃ (g) denote the value on 27.38σ_θ (27.54σ_θ), respectively