Fig. 4: Long term trend of standing stock of particulate organic nitrogen (PON).
From: Long term decline of the planktonic biomass in a hotspot of nitrogen fixation
a Temporal variability of the total area-integrated standing stock of PON (PONINT(0-50m)-total-area, in unit of Tg). The black solid line is the best-fit function obtained from model-II linear regression between the annual maximum value and time. The panel includes the coefficient of correlation, R. b Cumulative yearly (from November to October) integration of the PONINT(0-50m)-total-area within the top 50 m of the study area (red box on Fig. 1a). The black solid line is the best-fit function obtained from model-II linear regression. The panel includes the coefficient of correlation, R, and the slope, S, of the best linear fit. Dashed blue lines represent the 95% confidence interval.
