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Michiyo Shimamura,Hoi-Soo Jung,Kiseong Hyeong,Chan Min Yoo,Tsuyoshi Watanabe,Tomohisa Irino 한국지질과학협의회 2008 Geosciences Journal Vol.12 No.1
We propose skeletal δ18O of Platygyra, a hermatypicreef building masive coral, as a potential paleo-SST proxy in mid-latitude regions, where the commonly used massive Porites coralsare rare. Skeletal δ18O ratio (δ18Oc) of a Platygyra and Poritescorals collected from Ishigaki Island, Japan, shows a clear season-ality corresponding to SST variation. The temperature depen-dence of the Platygyra coral was estimated, for the first time withappropriate sampling resolution, at -0.219/oC (T = -4.57δ18Oc+2.65, r2=0.96). Masive Platygyra colonies show a wide distributionfrom the tropics to mid-latitudes further northwards than Porites.Platygyras adaptation to colder water temperature dependence of δ18Oc suggest its application as a potentialpaleo-SST proxy for mid-latitude regions, where high resolutionSST proxies are not available, as well as in tropical to subtropicalregions.
제주/쓰시마 조초성 산호의 수온 기록자로서의 가능성 평가
형기성,Michiyo Shimamura,Hiroya Yamano,Kaoru Sugihara,김종욱,Tsuyoshi Watanabe 한국해양과학기술원 2008 Ocean and Polar Research Vol.30 No.3
In an effort to develop high-resolution sea surface temperature (SST) proxies for mid-latitude regions, two massive reef-building coral species, Alveopora and Favia, were collected from Jeju and Tsushima Islands, respectively. Their skeletons were subsequently analyzed for annual growth banding, Sr/Ca and Mg/Ca ratios. Hermatypic corals are thinly distributed in the waters of Jeju Island, where Alveopora japonica was the only dominant coral species. A higher diversity of hermatypic corals were observed in the waters of Tsushima Island, where Favia sp. was the most common coral species and even forming an about 6-m-high reef structure. Both Alveopora and Favia showed annual growth layers consisting of couplets of high- and low-density bands. Sr/Ca ratio of both species and Mg/Ca ratio of Alveopora also showed seasonal variation, likely reflecting SST variation. These results suggest the possibility that Alveopora and Favia species can be used as potential SST proxies. However, this study also highlights the potential growth disturbance of middle latitude corals due to high rainfall during monsoon and low SST during winter. This possibility should be taken into account in the investigation of Sr/Ca(Mg/Ca)-SST relationships.
동해의 MIS 4 빙하기에 일어난 저염분화의 고해양학적 의미 : 부유성 유공충의 δ¹⁸O 및 δ¹³C 분석
김정무(Jung Moo Kim),송승욱(Seung Wook Song),현상민(Sang-Min Hyun),김진경(inkyung Kim),석봉출(Bong-Chool Suk),入野智久(Tomohisa Irino),島村道代(Michiyo Shimamura) 한국고생물학회 2009 고생물학회지 Vol.25 No.2
제4기 후기의 고해양 변화를 밝히기 위하여 동해 한국대지(Korea Plateau)에서 채취된 코어퇴적물(M04-PC1A; 131° 27.937′E, 38° 00.043′N, 수심 758.7m, 총길이 587㎝)로부터 부유성 유공충(Globigerina bulloides, Neogloboquadrina pachyderma)의 산소·탄소동위원소(δ¹?O, δ¹³C)를 고정밀(high-resolution) 간격으로 측정하였다. 산소·탄소동위원소 곡선과 알케논 변동곡선을 대비한 결과, 이 코어퇴적물의 지질시대는 산소동위원소층서(MIS; Marine Isotope Stage) 1-8(300 ka)에 해당되며, 제4기 후기의 빙하기인 MIS 2(12-24ka), MIS 4(59-74 ka), MIS 6(130-190 ka) 및 MIS 8(251-297 ka)에 δ¹?O값이 급격히 낮아지는(lighter) 주기적인 저염분화(low-salinity) 현상이 뚜렷하게 기록되어 있음을 확인하였다. 또한 δ¹³C값은 MIS 2와 MIS 4에서는 높아지고(heavier) MIS 6과 MIS 8에서는 낮아지는 특징을 나타낸다. MIS 2와 MIS 4에는 하천수가 유입하여 표층수에 담수층막(freshwater lid)이 형성되고 성층화되어 저층수가 무산소환경(anaerobic)으로 변하였기 때문에 δ¹³C값이 높게 나타나며, MIS 6과 MIS 8에는 해수의 수직순환운동(vertical circulation)이 비교적 원활해지면서 저층수로부터 12C가 포함된 유기물 영양분(nutrients)이 유입되어 표층수의 δ¹³C값이 낮게 나타나는 것이라고 추정된다. 동해는 제4기 후기 간빙기에 일어난 전지구적인 해수면 상승으로 인하여 태평양과 연결되면서 주로 해수온도의 영향을 받는다. 그러나 LGM을 포함한 빙하기에는 태평양으로부터 격리되면서 반고립화(semi-isolated)되었으며 해수온도보다는 주로 염분의 영향을 받아 지역적인 저염분화 현상을 주기적으로 나타내고 있다고 추정된다. To reconstruct the late Quaternary paleoceanographic changes in the East Sea, we have conducted high-resolution measurement of oxygen and carbon isotope values (δ¹?O, δ¹³C) of planktonic foraminifera (Globigerina bulloides, Neogloboquadrina pachyderma) collected from marine sediments of Korea Plateau (M04-PC1A; 131° 27.937′E, 38° 00.043′N, water depth: 758.7m, core length: 587cm). Through the comparison between oxygen and carbon isotope curves and alkenone SST curve, it was revealed that the core sediments were deposited during the last 300 thousand years (MIS 1-8). δ¹?O value of planktonic foraminifera shows sharp decreases, which correspond to low-salinity event, in the intervals of MIS 2 (12-24 ka), 4 (59-74 ka), 6 (130-190 ka), and 8 (251-297 ka). δ¹³C value significantly increases in MIS 2 and MIS 4, while it decreases in MIS 6 and MIS 8. Such changes in δ¹?O and δ¹³C values imply two different paleoceanographic conditions of the East Sea: 1. During MIS 2 and MIS 4, the sea was strongly stratified, with the freshwater lid and anaerobic bottom-water condition. 2. During MIS 6 and MIS 8, relatively active vertical circulation promoted the upwelling of 12C-rich organic nutrients, consequently decreasing δ¹³C value of the planktonic foraminifera. We conclude that the paleoceanographic conditions of the East Sea in the glacial periods of the late Quaternary are characterized by the salinity, rather than the sea surface temperature.