동해중부해역에서의 식물플랑크톤 번성과 바람과의 관계

Abstract

Relation between phytoplankton blooming and wind stress in the central Japan/East SeaHyun-cheol Kim1,2, Sinjae Yoo1 and Im Sang Oh21. Korea Ocean Research & Development Institute. 1205, Res. Bldg.1, 1270 Sa-dong Ansan, South Korea. E-mail: kimhc@kordi.re.kr2. School of Earth and Environmental Science, Seoul National University. San56-1, Sillim-dong, Gwanak-gu, Seoul, South KoreaThe seasonal dynamics of phytoplankton in the central Japan/East Sea showed pronounced year-to-year variability as observed from SeaWiFS (1997~now) and MODIS/Terra (2000~now). The variability seems to be strongly influenced by the wind, as the timing of spring blooms has a negative correlation with wind stress while the timing of fall blooms has a positive correlation with wind stress. To study this relationship, we hypothesize as follows: In spring, bloom will start after water column gets stabilized, which requires the wind-induced vertical mixing weakened. In fall, bloom will start when wind-driven vertical mixing resumes with seasonal wind. To test these hypotheses, we analyzed the daily remotely sensed wind stress data (AMI-wind, NSCAT and QuickSCAT: 1997~2003) and daily chlorophyll a concentration from the ocean color data. The results agreed well with the hypotheses. In spring, bloom started 6~10 days after the wind weakened. In fall, blooming started 1~4 days after with wind, which mixes water and supplies nutrients to the euphotic layer. We try to explain the possible mechanism by a simple box-model.