물리-생지화학 결합 모형을 이용한 여름철 동해 난수성 소용돌이내의 N-P-Z-D 분포 특성

Abstract

Mesoscale eddies appear frequently in the East Sea (Japan Sea) and they have significant effects on the distributions of nutrients (N), phytoplankton (P), zooplankton (Z) and detritus (D) resulting in changes of carbon export into the deep layer, especially in summer. In this study, we have analysed three kinds of nutrients (phosphate, nitrate, silicate), diatoms, three size-classed phytoplankton and zooplankton functional groups, as well as dissolved and particulate organic carbon in an anticyclonic eddy simulated by a coupled system. It is based on three-dimensional baroclinic ocean circulation model, POLCOMS (Proudman Oceanographic Laboratory Coastal Ocean Modelling System) and a lower trophic biogeochemical model, ERSEM (European Regional Seas Ecosystem Model). The phytoplankton uses the entrained nutrients at the rim of warm eddy as the light is available for photosynthesis resulting in subsurface chlorophyll maximum layer, which is formed just on top of the euphotic depth. The distributions of phytoplanktons inside the eddy are locally different and characterized by their types. Diatoms are the major source of total chlorophyll-a blooming at the subsurface rim of the eddy and the pico-phytoplankton has the second largest biomass along the slope of the euphotic depth lowered to the center of the eddy. Nano-phytoplankton, the least biomass though, blooms on top layer of the diatoms in the rim area and also in tlayer, especially in summer. In this study, we have analysed three kinds of nutrients (phosphate, nitrate, silicate), diatoms, three size-classed phytoplankton and zooplankton functional groups, as well as dissolved and particulate organic carbon in an anticyclonic eddy simulated by a coupled system. It is based on three-dimensional baroclinic ocean circulation model, POLCOMS (Proudman Oceanographic Laboratory Coastal Ocean Modelling System) and a lower trophic biogeochemical model, ERSEM (European Regional Seas Ecosystem Model). The phytoplankton uses the entrained nutrients at the rim of warm eddy as the light is available for photosynthesis resulting in subsurface chlorophyll maximum layer, which is formed just on top of the euphotic depth. The distributions of phytoplanktons inside the eddy are locally different and characterized by their types. Diatoms are the major source of total chlorophyll-a blooming at the subsurface rim of the eddy and the pico-phytoplankton has the second largest biomass along the slope of the euphotic depth lowered to the center of the eddy. Nano-phytoplankton, the least biomass though, blooms on top layer of the diatoms in the rim area and also in t