북태평양생태계에서의 엽록소 a 변화

Abstract

Variability of Chl-a in the North Pacific ecosystemsSinjae Yoo1, Hyun-Cheol Kim1 and Stewart M. McKinnell21 Marine Living Resources Research Division, KORDI, Sa-dong 1270, Ansan, South Korea 425-170. E-mail: sjyoo@kordi.re.kr2 North Pacific Marine Science Organization, c/o Institute of Ocean Sciences P.O. Box 6000, Sidney, British Columbia, Canada V8L 4B2To understand the characteristics of interannual variability in phytoplankton dynamics in the North Pacific marine ecosystems, satellite chlorophyll-a data from 1998 through 2003 were analyzed. Since there were one large and one moderate El Niño, and one large La Niña during the period, this analysis basically aims at the response of phytoplankton to ENSO events. Regional chlorophyll-a dynamics showed diverse patterns of seasonal cycles: unimodal, bimodal, or irregular cycles with high amplitudes or low level of chlorophyll-a. The phase and amplitude of chlorophyll-a cycles in each region showed high interannual variability. Despite such diverse patterns in seasonal cycles, EOF analysis indicates that a large portion of chlorophyll-a variability corresponded to basin-scale SST anomaly pattern in the North Pacific. We interpret that the SST pattern is symptomatic of complex physical regime rather than the causal factor to the chlorophyll variability. We attempt to propose hypotheses on the mechanisms for such correspondence.