High-resolution stable isotope variations in a coral Porites lutea from the Wenno Island, Micronesia: Implications of low-latitude ocean environments

서지정보

· 발행기관 : 대한지질학회
· 수록지 정보 : 지질학회지 / 57권 / 2호 / 181 ~ 193페이지
· 저자명 : 현상민, 김한준, 박흥식

초록

The scleractinian coral (Porites lutea) collected near Wenno Island, tropical Micronesia in the South Pacific, was analyzed to investigate the stable oxygen and carbon isotope composition over the past 22 years.
High-resolution isotope results clearly showed 22 cyclic annual variations (July 1985 to June 2007) even though seasonal variations in sea surface temperature (SST) is relatively small (< 2℃), which are consistent with an annually-banded skeleton in the coral. The interrelationships between in situ instrumental observation on SST, sea surface salinity (SSS), and stable oxygen isotope values generate the relatively strong negative and weak correlation curves (R2 = 0.77 for SST and 0.35 for SSS). Based on these investigations, coral isotopic amplitude suggests that the SST may reflect the local environment in a lagoon associated with low-latitude oceanography.
Further, comparison with Niño-3/-4 SST anomalies (ONI index; Ocean Nino Index) suggests that the small island’s low-latitude environment has been influenced by El Niño Southern Oscillation (ENSO) events as well as local oceanographic environmental changes for the last 22 years. Therefore, our data combined with the previous result indicates that corals isotope from Micronesia provide low-latitude and local oceanographic environmental changes and can be used to speculate past atmospheric-oceanographic environmental changes across the wide area.

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