The Distributions of Nutrients, Chlorophyll-a, and Primary Productivity in the South Pacific Ocean

남태평양의 영양염, 엽록소, 일차생산성 분포

  • Kim, Dong-Yup (Polar Research Laboratory, Korea Ocean Research and Development Institute) ;
  • Shim, Jung-Hee (Polar Research Laboratory, Korea Ocean Research and Development Institute) ;
  • Song, Hwan-Seok (Department of Oceanography, Pukyong National University) ;
  • Kang, Young-Chul (Polar Research Laboratory, Korea Ocean Research and Development Institute) ;
  • Kim, Dong-Seon (Polar Research Laboratory, Korea Ocean Research and Development Institute)
  • 김동엽 (한국해양연구원 극지연구본부) ;
  • 심정희 (한국해양연구원 극지연구본부) ;
  • 송환석 (부경대학교 해양학과) ;
  • 강영철 (한국해양연구원 극지연구본부) ;
  • 김동선 (한국해양연구원 극지연구본부)
  • Published : 2001.02.28

Abstract

The vertical distributions of temperature, salinity, dissolved oxygen, nutrients, chlorophyll, and primary production were investigated within the top 200m water depth in the south Pacific Ocean in February,2000. The study area ($24^{\circ}-41^{\circ}S,\;81^{\circ}-168^{\circ}W$) can be hydrologically divided into two regions. Upwelling was actively occurring in the eastern region of the $110^{\circ}S$ line, meanwhile it was not active in the western region. Accordingly, chemical properties in the surface waters were different between the two regions; nitrate+nitrite and phosphate concentrations were much higher in the eastern region than in the western region due to the active upwelling, but silicate concentration was higher in the western region. Among the nutrients, the major element influencing primary production was also different between the two regions; silicon would be a major element influencing primary production in the eastern region, but nitrogen may act as a major element for primary production in the western region. Primary production showed similar values in the two regions in spite of the large differences of nutrient concentrations in the surface waters, but the total chlorophyll integrated within the 200 m water depth was almost twice as much as in the western region than that in the eastern legion.

Keywords

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