Wintertime particulate organic matter distributions in surface waters of the northern California current system

摘要: Abstract Semi-automated sampling via the surface underway systems of research vessels was used to explore distribution and composition particulate organic matter in waters northern California Current ecosystem during winter, a poorly studied period that is characterized by downwelling favorable winds elevated discharge coastal rivers. New wintertime observations were compared those measured summer cruise strong upwelling highly reduced river flows. Particulate carbon (POC) concentrations along Oregon shelf winter periods significantly lower (7.0 ± 5.0 μM) than same region (21 ± 25 μM) with similar seasonal contrasts chlorophyll (Chl) (1.7 ± 1.7 mg Chl m−3 8.7 ± 3.8 mg summer). The combination POC, Chl, particle beam attenuation (cp) measurements revealed spatial temporal distributions confirm importance physical drivers such as wind, waves influencing biogeochemistry eastern boundary current non-upwelling conditions. Elevated contributions allocthonous materials distinct compositional characteristics, including low Chl:POC POC:cp ratios, low-density, low-salinity influenced discharge. In contrast, mid-salinity, intermediate-density exhibited higher POM which approached productive periods. These results are solid evidence for phytoplankton productivity this margin under buoyancy nutrient from