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남극해 여름 클로로필 경년 변동: 엔소의 영향

Interannual Variability of Summer Chlorophyll in the Southern Ocean: ENSO Effects

김용선|장찬주|손영백
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)|2015.06|Ocean and Polar Research|제37권 제2호|pp. 149-159|DOI http://dx.doi.org/10.4217/OPR.2015.37.2.149

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참고문헌

키워드

SSTENSOsea-icechlrorophyllSouthern Annular Mode
주제분류해양학

초록

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 Niño Southern Oscillation (ENSO), using satellite ocean color data covering 16 years from 1997 to 2012. During El Niño periods, chlorophyll concentration tends to increase in the subtropics (north of the subantarctic front). This chlorophyll increase is likely linked to El Niñoinduced 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.

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 Niño Southern Oscillation (ENSO), using satellite ocean color data covering 16 years from 1997 to 2012. During El Niño periods, chlorophyll concentration tends to increase in the subtropics (north of the subantarctic front). This chlorophyll increase is likely linked to El Niñoinduced 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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