Abstract
The samples for organic carbon analysis were collected between <TEX>$5^{\circ}\;and\;17^{\circ}N$</TEX> along <TEX>$131.5^{\circ}W$</TEX> in the northeast Pacific KODOS (Korea Deep Ocean Study) area. The mean concentration of total organic carbon (TOC) in the surface mixed layer <TEX>$({\sim}50 m)$</TEX> was <TEX>$100.13{\pm}2.05{\mu}M-C$</TEX>, while the mean concentration of TOC in the lower 500m of the water column was <TEX>$50.19{\pm}4.23{\mu}M-C$</TEX>. A strong linear regression between TOC and temperature <TEX>$(r^2=0.70)$</TEX> showed that TOC distribution was controlled by physical process. Results from the linear regression between chlorophyll-a and TOC, and between chlorophyll-a and particulate organic carbon (POC), decreasing of dissolved organic carbon (DOC) in the surface layer caused by non-biological photo-oxidation process. Below the surface layer, biological production and consumption occurred. DOC accumulation dominated in the depth range of <TEX>$30{\sim}50m$</TEX> and DOC consumption occurred in the depth range of <TEX>$50{\sim}200m$</TEX>. TOC was inversely correlated with apparent oxygen utilization (AOU) and TOC/AOU molar ratios ranged from -0.077 to -0.21. These ratios indicated that TOC oxidation was responsible fur <TEX>$10.9{\sim}30.1%$</TEX> (mean 20.2%) of oxygen consumption in the NE Pacific KODOS area. In the euphotic zone, distributions of dissolved and particulate organic matter were controlled by photo-chemical, chemical, biological and physical processes.
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