Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Interannual Variability of Summer Chlorophyll in the Southern Ocean: ENSO Effects

남극해 여름 클로로필 경년 변동: 엔소의 영향

  • 김용선 (한국해양과학기술원 물리연구본부) ;
  • 장찬주 (한국해양과학기술원 물리연구본부) ;
  • 손영백 (한국해양과학기술원 제주국제해양과학연구.지원센터)
  • Received : 2014.11.21
  • Accepted : 2015.06.08
  • Published : 2015.06.30
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Abstract

The Southern Ocean (SO) plays a primary role in global climate by storing and transporting anthropogenic carbon dioxide through the meridional overturning circulation and the biological pumping process. In this study, we aim to investigate interannual variability of summer chlorophyll concentration in the SO and its relation with the El $Ni{\tilde{n}}o$ Southern Oscillation (ENSO), using satellite ocean color data covering 16 years from 1997 to 2012. During El $Ni{\tilde{n}}o$ periods, chlorophyll concentration tends to increase in the subtropics (north of the subantarctic front). This chlorophyll increase is likely linked to El $Ni{\tilde{n}}o$-induced surface cooling that increases nutrient supply through enhanced vertical mixing in the subtropics. On the other hand, the subpolar gyres show localized chlorophyll changes in response to the ENSO. The localized response seems to be primarily attributed to changes in sea-ice concentrations. Our findings suggest that ENSO contributes interannual variability of chlorophyll in the SO through different mechanisms depending on regions.

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