Figure 2. The vertical profiles of (a) δ13CPOM, (b) δ15NPOM, and (c) the C:N ratio collected at nine stations in the eastern part of the Sea of Japan during September of 2020 (cross stations in Figure 1). Lines denote the profiles of every station. Box plots show the median (vertical thick lines within boxes), upper and lower quartiles (boxes), quartile deviations (horizontal bars), and outliers (closed circles).