冲绳海槽末次冰期以来千年尺度古海洋演化的沉积记录

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Piston cores CSH1 and DGKS9603 used in this study were collected from the Middle Okinawa Trough(31°13.733′N, 128° 43.471′E, water depth 703m and 28°08.869′N, 127°16.238′E , water depth 1100 m, respectively)during a China-France joint survey in the East China Sea. The palynologic assemblages of core CSH1 and planktonic foraminifers investigated in this work, provide a direct historical record of paleoclimate oscillations during the last 50 kyrs. A total of six cooling events were identified based on sporepollen assemblages of core CSH1, these cold events occurred at 4.1~4.6, 11.7~13.0, 15.4、23.2, 29.4 and 47.4 ka respectively. The planktonic foraminiferal δ~ 18 O, faunal variations and MAT SST records of core DGKS9603 also show six cooling events during the last 50 kyrs, unlike core CSH1 these events occurred at 11.7~13.0, 14.7, 24.3, 28.5, 36.9 and 45.3 ka respectively. The cold events of the two piton cores show good correlation with the coldest stadials of Dansgaard-Oeschger cycles documented from the Greenland GRIP ice cores, δ~ 18 O record corresponding to the youngest five Heinrich events. Our study indicates that cold events(Younger Dryas event and the four Heinrich events H1, H2, H3, H5)shown by different palaoenvironment investigative methods in different regions from the Okinawa Trough correlated well. Although the true climate teleconnections between the Okinawa Trough and Greenland and the North Atlantic is unclear, millennial to centennial fluctuations in the intensity of the East Asian monsoon circulation induced by climate oscillations in the high latitudes of the North Hemisphere could be the main mechanism. Piston cores CSH1 and DGKS9603 used in this study were collected from the Middle Okinawa Trough (31 ° 13.733’N, 128 ° 43.471’E, water depth 703m and 28 ° 08.869’N, 127 ° 16.238’E, water depth 1100 m, respectively) during a China-France joint survey in the East China Sea. The palynologic assemblages of core CSH1 and planktonic foraminifers investigated in this work, provide a direct historical record of paleoclimate oscillations during the last 50 kyrs. A total of six cooling events were identified based on sporepollen assemblages of core CSH1, these cold events occurred at 4.1 ~ 4.6, 11.7 ~ 13.0, 15.4, 23.2, 29.4 and 47.4 ka respectively. The planktonic foraminiferal δ ~ 18 O, faunal variations and MAT SST records of core DGKS9603 also show six cooling events during the last 50 kyrs, unlike core CSH1 these events occurred at 11.7 ~ 13.0, 14.7, 24.3, 28.5, 36.9 and 45.3 ka respectively. The cold events of the two piton cores show good correlation with the coldest stadials of Dansga ard-Oeschger cycles documented from the Greenland GRIP ice cores, δ ~ 18 O record corresponding to the youngest five Heinrich events. Our study indicates that cold events (Younger Dryas event and the four Heinrich events H1, H2, H3, H5) shown by different palaoenvironment investigative methods in different regions from the Okinawa Trough correlated well.. Although the true climate teleconnections between the Okinawa Trough and Greenland and the North Atlantic is unclear, millennial to centennial fluctuations in the intensity of the East Asian monsoon the high latitudes of the North Hemisphere could be the main mechanism.
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