We examined sediment samples from twenty-four stations in the Indo-Pacific warm pool(IPWP)region. Our objective is to provide a better understanding of changes in the IPWP and related tropical climatic phenomena such ...We examined sediment samples from twenty-four stations in the Indo-Pacific warm pool(IPWP)region. Our objective is to provide a better understanding of changes in the IPWP and related tropical climatic phenomena such as East Asian-Australian monsoon and El Ni(?)o-Southern Oscillation(ENSO),through improving spatial coverage of proxy records.In order展开更多
First, an attempt is made to reconstruct the past climate distributi(?) (?)ast Asia, based on the results by the previous works in Japan, China (?) Korea with special reference to the period since the last glaciat(?) ...First, an attempt is made to reconstruct the past climate distributi(?) (?)ast Asia, based on the results by the previous works in Japan, China (?) Korea with special reference to the period since the last glaciat(?) Generally speaking, the phases of warm/cold periods were occur(?) simultaneously. The southern limits of several indicators of the last glacial periods run latitudinally in parallel with those at present. But, it was展开更多
边缘海沉积物的化学风化过程与全球变化息息相关,但是其化学风化强度对古气候和海平面变化的响应机制还存在争议。本研究利用山东半岛近岸泥质区LHSD-1钻孔沉积物数据,通过多种化学风化指标(CIA、WIP、CIX、α^(Al)E)恢复末次盛冰期以...边缘海沉积物的化学风化过程与全球变化息息相关,但是其化学风化强度对古气候和海平面变化的响应机制还存在争议。本研究利用山东半岛近岸泥质区LHSD-1钻孔沉积物数据,通过多种化学风化指标(CIA、WIP、CIX、α^(Al)E)恢复末次盛冰期以来沉积物的化学风化强度。分析Al/Si比值校正粒度效应发现,LHSD-1钻孔沉积物的化学风化指标受沉积物源影响较小,但在11.4~9.0 ka显著受到海平面变化导致的沉积旋回作用影响,表现为CIA(Chemical Index of Alteration)和WIP(Weathering Index of Parker)的不一致性。在高海平面时期(7.6 ka至今),CIA主要受东亚季风的控制,特别是8.2、7.2和4.2 ka冷事件东亚冬季风增强时,CIA快速降低,说明源区化学风化强度能快速响应气候变化。在低海平面时期,CIA等风化指标显示该时期沉积物化学强度增强,这与前人在赤道陆架研究的结论一致。我们认为,末次冰期海平面降低导致的陆架暴露是化学风化增强的主要因素,因此,我们提出在冰期-间冰期旋回尺度上,海平面变化通过控制沉积物的滞留时间来影响到边缘海沉积物的风化指标记录。这一新发现对认识冰期-间冰期旋回尺度上的全球气候变化和碳循环具有重要意义。展开更多
文摘We examined sediment samples from twenty-four stations in the Indo-Pacific warm pool(IPWP)region. Our objective is to provide a better understanding of changes in the IPWP and related tropical climatic phenomena such as East Asian-Australian monsoon and El Ni(?)o-Southern Oscillation(ENSO),through improving spatial coverage of proxy records.In order
文摘First, an attempt is made to reconstruct the past climate distributi(?) (?)ast Asia, based on the results by the previous works in Japan, China (?) Korea with special reference to the period since the last glaciat(?) Generally speaking, the phases of warm/cold periods were occur(?) simultaneously. The southern limits of several indicators of the last glacial periods run latitudinally in parallel with those at present. But, it was
文摘边缘海沉积物的化学风化过程与全球变化息息相关,但是其化学风化强度对古气候和海平面变化的响应机制还存在争议。本研究利用山东半岛近岸泥质区LHSD-1钻孔沉积物数据,通过多种化学风化指标(CIA、WIP、CIX、α^(Al)E)恢复末次盛冰期以来沉积物的化学风化强度。分析Al/Si比值校正粒度效应发现,LHSD-1钻孔沉积物的化学风化指标受沉积物源影响较小,但在11.4~9.0 ka显著受到海平面变化导致的沉积旋回作用影响,表现为CIA(Chemical Index of Alteration)和WIP(Weathering Index of Parker)的不一致性。在高海平面时期(7.6 ka至今),CIA主要受东亚季风的控制,特别是8.2、7.2和4.2 ka冷事件东亚冬季风增强时,CIA快速降低,说明源区化学风化强度能快速响应气候变化。在低海平面时期,CIA等风化指标显示该时期沉积物化学强度增强,这与前人在赤道陆架研究的结论一致。我们认为,末次冰期海平面降低导致的陆架暴露是化学风化增强的主要因素,因此,我们提出在冰期-间冰期旋回尺度上,海平面变化通过控制沉积物的滞留时间来影响到边缘海沉积物的风化指标记录。这一新发现对认识冰期-间冰期旋回尺度上的全球气候变化和碳循环具有重要意义。
