Fig. 13

Simulated seasonal changes of nitrate supply for before and after the regime shift in 1977. a Total nitrate supply, b nitrate supply by vertical advection, c nitrate supply by horizontal advection, and d nitrate supply by vertical diffusion into the coastal upper 30 m of the water column. Black line with closed circles represents 1966–1975 mean for October–December and 1967–1976 mean for January–June. Gray line with crosses represents 1976–1985 mean for October–December and 1977–1986 mean for January–June. Error bar represents the standard error. The positive/negative value denotes that nitrate increases/decreases in the coastal upper 30 m of the water column