Extended Data Fig. 6: Visualization of the sensor-based POC estimation.
From: Carbon dioxide sink in the Arctic Ocean from cross-shelf transport of dense Barents Sea water
a and b, examples for power law curve fitting on relative cumulative particle volume (cumulative volume: total volume; Volcum:Voltot) and transformed particle size bin centers (ESDt) for one UVP depth bin of 5 m, respectively. c, regression for POC >0.1 mm between coefficients (a) and exponents (b) of the power law functions fitted over the relative cumulative particle size distributions, the particle volume between 0.1–2 mm, and the measured POC concentration >0.1 mm ESD. Color code represents 4th dimension for discrete measurements (dots) and the resulting regression (shade) of POC >0.1 mm. d, regression for POC< 0.1 mm between turbidity and chlorophyll a fluorescence and corresponding measurements of POC< 0.1 mm. Shaded area represents resulting regression for POC< 0.1 mm. e, Difference between measured concentrations from samples and estimated POC concentrations for the fraction <0.1 mm (red) and >0.1 mm (blue). Golden shade indicates area between −10 and 10 mg m−3. See also Extended Data Table 2 for regression specifications and results.
