Heinrich event imprints in the Okinawa Trough: evidence from oxygen isotope and planktonic foraminifera
- 作者：Li ; Tiegang ; Liu ; Zhenxia ; Hall ; Michael A. ; Berne ; Serge ; Saito ; Yoshi ; Cang ; Shuxi ; Cheng ; Zhenbo
- 关键词：Heinrich events ; planktonic foraminifera ; sea surface temperature ; oxygen isotope ; Okinawa trough
- 刊名：Palaeogeography ; Palaeoclimatology ; Palaeoecology
- 出版年：2001
- 期刊代码：68_00310182
- 类别：ear
- 出版时间：December 25, 2001
- 卷：176
- 期：1-4
- 页码：133-146
- 文件大小：2.90 M
摘要
Planktonic foraminiferal faunas, oxygen isotope and modern analog technique sea surface temperature records were obtained in piston core DGKS9603 (28°08.869′N, 127°16.238′E, water depth 1100 m) collected from the middle Okinawa Trough. During the last glaciation, four cold events were identified and correlate Heinrich events (HE) H2–5 of the last 45 ka. During the last deglaciation, core DGKS9603 has begun to be influenced by the Kuroshio since about 16 cal ka BP. Three weakenings of this warm current occurred at about 2.8–5.3, 11.4 and 15.5 cal ka BP respectively. Among the three fluctuations, the oldest one is synchronous with HE1 and could be a response to the strong cooling observed in the North Atlantic Ocean. The fluctuation occurring at about 11.4 cal ka ago corresponds to the Younger Dryas within the age error bars. Our observations provide new evidence that the HEs documented from Greenland and the northern North Atlantic had a global climatic impact. Changes in the intensity of the East Asian monsoon could be the main mechanism responsible for the paleoceanographic variations observed in the Okinawa Trough.