동중국해와 황해에서 위성자료에 의한 클로로필의 시공간적 분포 특성과 이와 관련된 해양학적 특성 연구

Abstract

Patterns in chlorophyll representing the spatial and temporal distribution of phytoplankton communities, which can reveal a great deal about the oceanic processes underlying their formation in the East China Sea (ECS) and Yellow Sea (YS), were investigated using the data assimilated from satellite sensors abroad. Sea surface temperature (SST) analyzed from Advanced Very High Resolution Radiometer (AVHRR) thermal infrared data were used to elucidate the physical factors responsible for the evolution of such patterns in the inner and outer shelves areas of the ECS. SeaWiFS-derived chlorophyll maps were used to examine intricate and striking patterns of phytoplankton blooms in the ECS and YS. Three different natures of phytoplankton assemblages were interpreted from the SeaWiFS ocean color data. The Chl-1 exhibited distinct pattern and persistent formation of dense phytoplankton blooms resulting from the Yangtze banks of the ECS during winter is thought to be associated with high nutrients derived from the Yangtze river. As previously investigated by Ahn et al. (2004), the winter blooms that originate from the Yangtze estuary led to the occurrence of the following stages-Infant Stage, Youth Stage, Mature Stage and Old Stage. The evolution of each of these stages is the result of the availability of nutrients, sunlight, nature of water mass and tidal and oceanic currents within the study region. As a part of this study, in situ data was collected along the pathway of the Jeju Warm Current, near Jeju-do Island, which confirmed the occurrence of phytoplankton assemblages along the direction of frontal system of the ECS during the evolution of mature stage. In contrast, hydrographic features and chlorophyll distribution maps led us to conclude that dense phytoplankton blooms (Chl-2) appearing off the shelf were closely linked with the upwelling, yielding high nutrients from the Kuroshio warm waters, exhibiting a short term variability during winter. The chlorophyll concent