동해 남서부해역에서의 고분해능 침강입자채집기 실험

Abstract

High resolution sediment trap experiment was carried out to understand the biogeochemical processes in the southwestern East/Japan Sea. Traps were deployed in the depths of 1,020 m and 2,100 m at the inter-plain gap between Ulleung and Dok islands (37°25.77′N, 132°30.27′E, 2300 m) in 1999 with shorter than 10 days sampling interval. The water temperature and current at 350 m depth using RCM 7 at the site adjacent to the sediment trap mooring site were also utilized to aid our data analysis. This high resolution temporal observations showed many important characteristics related to the productivity of the southwestern East/Japan Sea: 1) Ulleung Warm Eddy enhanced primary productivity as evidenced by a simultaneous variation in water temperature at 100 m and particulate organic carbon fluxes at 1,020 m depth. 2) Siliceous phytoplankton species dominated spring and autumn blooms. The ratio of biogenic silica flux to particulate organic carbon flux increased during these two seasons 3) Calcareous productivity was observed during August when surface water temperature was the highest when the ratio of calcium flux to aluminum flux peaked its maximum 4) Small sized primary producers such as nano- or pico- plankton dominated in summer. Dissolution of sinking particulate organic carbon appeared to be great in the water column between 1,020 m and 2,100 m compare to other seasons 5) Nitrogen fixer appeared to contislands (37°25.77′N, 132°30.27′E, 2300 m) in 1999 with shorter than 10 days sampling interval. The water temperature and current at 350 m depth using RCM 7 at the site adjacent to the sediment trap mooring site were also utilized to aid our data analysis. This high resolution temporal observations showed many important characteristics related to the productivity of the southwestern East/Japan Sea: 1) Ulleung Warm Eddy enhanced primary productivity as evidenced by a simultaneous variation in water temperature at 100 m and particulate organic carbon fluxes at 1,020 m depth. 2) Siliceous phytoplankton species dominated spring and autumn blooms. The ratio of biogenic silica flux to particulate organic carbon flux increased during these two seasons 3) Calcareous productivity was observed during August when surface water temperature was the highest when the ratio of calcium flux to aluminum flux peaked its maximum 4) Small sized primary producers such as nano- or pico- plankton dominated in summer. Dissolution of sinking particulate organic carbon appeared to be great in the water column between 1,020 m and 2,100 m compare to other seasons 5) Nitrogen fixer appeared to cont