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- W2365770879 abstract "To study local response in the Okinawa Trough to the event of global carbon cycle, along with local influence of regional environmental factors, a gravity piston core CSH1 that was retrieved in the northern Okinawa Trough was collected. The core contains environmental records of last 48ka. 142 samples were made in interval of 8—12 cm. Planktonic foraminifera coarser than 150μm were identified and counted. δ18O and δ 13C measurements were performed on the shells of G. ruber and N. dutertrei respectively, using an IsoPrime mass spectrometer. The isotopic records of core CSH1 were compared with those of core DGKS9603 in the middle of Okinawa Trough. δ 13C records of the two cores were again compared with those of the South China Sea, the Sulu Sea, eastern equatorial Pacific, and western equatorial Pacific. Additionally, the δ 13C profile of G. ruber in Core CSH1 was contrasted to those of ice cores and loess. Four δ 13C depletion stages were recognized at 44—38.5, 36—30, 25—18.5, and 14—10 cal. kaB.P.. Disagreement in δ 18O gradient and SST gradient between the two cores indicated that large amount of terrestrial freshwater had invaded to the northern Okinawa Trough resulting in salinity reduction and δ 13C depletion, as freshwater carried low δ 13C terrestrial materials. Comparison among sediments of ocean, ice, and loess disclosed the correspondence between global environmental variations and these stages. Therefore, the δ 13C profile in the trough was the combination of global change in carbon stock and the local environmental factors. Warm surface water of open Pacific and global change in greenhouse gas concentration had clearly affected the Okinawa Trough in the last glaciation event." @default.
- W2365770879 created "2016-06-24" @default.
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- W2365770879 date "2007-01-01" @default.
- W2365770879 modified "2023-09-25" @default.
- W2365770879 title "CARBON ISOTOPE RECORD AND ITS ENVIRONMENT IMPLICATION IN THE OKINAWA TROUGH DURING THE LAST 48 KYS" @default.
- W2365770879 hasPublicationYear "2007" @default.
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