Indonesian Throughflow Actions during Last Glacial Maximum
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摘要: 印度尼西亚穿越流是西太平洋和印度洋之间热量传输的重要载体, 穿越流的活动由潜在地影响El Nino和季风现象进而影响到全球气候变化.通过对爪哇海SHI9006岩心LGM以来氧同位素、有孔虫与CaCO3沉积量、浮游有孔虫浅层水种与深层水种比值反映的古温跃层变化等的研究, 得出结论: 研究区末次冰期氧同位素2期穿越流活动微弱, 冰后期穿越流活动增强; 特别是冰消期终止期ⅠA, 穿越流活动由弱迅速增强, 是冰川消融、海平面上升, 印度尼西亚岛弧古海水通道开放的结果.Abstract: Indonesian throughflow is the important carrier of the heat transport between the western Pacific Ocean and the Indian Ocean. Throughflow actions affect the global climate changes by influencing potentially El Nino events and monsoon actions. Based on the studies of the oxygen isotope, the mass accumulation rates of foraminifera and CaCO3, the thermocline estimated by the ratio of the planktonic foraminifera shallow-dwelling species and deep-dwelling species, we know that the throughflowwasweak during the last glacial oxygen isotope stage 2, and enhanced during the interglacial oxygen isotope stage 1. Especially in the deglaciation termination ⅠA, the throughflow changed rapidly from weak to strong. This is due to the ice sheetmelting, sea level rising, and the Indonesian Archipelagowater pathways opening.
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Key words:
- Indonesian Archipelago /
- throughflow /
- last glacial maximum /
- foraminifera /
- paleothermocline /
- paleoproductivity
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图 1 现代印尼海区八月表层洋流活动示意和SHI9006岩心位置
Fig. 1. Surface currents of the Indonesian archipelago in August and location of core SHI9006
图 2 SHI9006岩心氧同位素、浮游有孔虫部分属种的相对丰度变化及表层海水温度曲线(阴影区表示终止期ⅠA及LGM)
Fig. 2. Curve of δ18O, relative abundance of some planktonic foraminiferal taxa and SST in core SHI9006 (the shadow areas indicate termination ⅠA and LGM)
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