석산호 골격의 산소 및 탄소 안정동위원소 조성을 이용한 대한해협 지역의 고기후 분석을 위한 선행연구

Title
석산호 골격의 산소 및 탄소 안정동위원소 조성을 이용한 대한해협 지역의 고기후 분석을 위한 선행연구
Alternative Title
A prelimanary study on high-resolution paleoclimate reconstruction in the Korea Strait region using oxygen and carbon isotopic composition of scleractinian coral
Author(s)
Shimamura, Michiyo; 서인아; 형기성; 이용일; 유찬민
KIOST Author(s)
Hyeong, Kiseong(형기성)Yoo, Chan Min(유찬민)
Publication Year
2009-10-29
Abstract
Geochemical compositions of massive coral skeletons have been used as common proxies for seasonal to decadal climate variations in tropical/subtropical regions. Sr/Ca ratio of coral skeletons depends on sea surface temperature (SST) while δ18O does on both SST and δ18O of seawater. Thus, combination of Sr/Ca ratios and δ18O of coral skeletons allows decoupling of sea surface salinity (SSS) and SST from δ18O signal.For palecoclimate reconstruction of Korea Strait region, a 90-cm-long core of living massive reef-building coral, Favia sp. (Family Faviidae), was collected from Iki Island, Japan and the top 28 cm interval was analyzed for δ18O. Favia sp. shows a wide distribution from tropics to middle latitude region and records surrounding environmental conditions in its skeleton. Because commonly used proxy corals such as Porites are absent in middle latitude region, Favia is the only proxy coral that are available in Korea Strait region. δ18O of the top 28 cm interval revealed 41 annual cycles caused by seasonal environmental changes, indicative of its growth period from 1966 to 2007. The measured oxygen and carbon isotope ratios decrease gradually to the present, indicative of SST (and/or precipitation) increase and incorporation of light carbon from fossil fuel burning to the ocean during the last 41 years. The analytical works for Sr/Ca ratios are still in progress. With completion of Sr/Ca measurement, it is possible to reveal SST and SSS variation of the region for the past 41 years. This study will enable the quantitative evaluation of global warming in this region.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/29248
Bibliographic Citation
2009 추계지질과학연합학술발표회, pp.66, 2009
Publisher
대한지질학회
Type
Conference
Language
Korean
Publisher
대한지질학회
Related Researcher
Research Interests

Ocean Geology,Mineral resources,해양지질,광물자원

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