남극해 클로로필 경년 변동성

Abstract

Satellite ocean color data from the SeaWiFS and MODIS were used to examine the interannual variability of summer chlorophyll concentration in the Southern Ocean for the period between 1998 and 2012. To achieve consistency in the chlorophyll concentration between SeaWiFS and MODIS, we used an improved standard chlorophyll algorithm (OC v6). The averaged chlorophyll concentration in the Southern Ocean shows a persistent increasing trend of about 5.4% for the past 16 years with interannual fluctuations. On the assumption that interannual variability is affiliated with equatorial buoyancy forcing, El Ni&ntilde o and Southern Oscillation (ENSO), we analysed composite and regressed fields. Composite fields El Ni&ntilde o and La Ni&ntilde a months, in consistence with the regression analysis, show a spatially opposite relationship (r = -0.73) with very localized patterns. During El Ni&ntilde o months, chlorophyll concentration tends to increase in the South Pacific, while decrease over the Enderby and Argentine abyssal plains. Based on the R-square between observed and regressed fields, ENSO contributes about 3.5% of total variance in an area-averaged frame. The observed relationship points to the important influences of the teleconnected ENSO on the Southern Ocean chlorophyll. concentration between SeaWiFS and MODIS, we used an improved standard chlorophyll algorithm (OC v6). The averaged chlorophyll concentration in the Southern Ocean shows a persistent increasing trend of about 5.4% for the past 16 years with interannual fluctuations. On the assumption that interannual variability is affiliated with equatorial buoyancy forcing, El Ni&ntilde o and Southern Oscillation (ENSO), we analysed composite and regressed fields. Composite fields El Ni&ntilde o and La Ni&ntilde a months, in consistence with the regression analysis, show a spatially opposite relationship (r = -0.73) with very localized patterns. During El Ni&ntilde o months, chlorophyll concentration tends to increase in the South Pacific, while decrease over the Enderby and Argentine abyssal plains. Based on the R-square between observed and regressed fields, ENSO contributes about 3.5% of total variance in an area-averaged frame. The observed relationship points to the important influences of the teleconnected ENSO on the Southern Ocean chlorophyll.