Oxygen-isotope record of sea level and climate variations in the Sulu Sea over the past 150,000 years
Oxygen-isotope record of sea level and climate variations in the Sulu Sea over the past 150,000 years
复制标题
DOI：
10.1038/380234a0
复制
发表时间：
1996-03
期刊：
影响因子：
64.8
通讯作者：
B. Linsley
中科院分区：
文献类型：
--
作者：
B. Linsley
苏禄海位于西太平洋的“暖池”，那里的年平均温度是地球上最高的。由于这一巨大热源为大气提供了大部分水蒸气和潜热，因此了解该区域的气候历史对于重建全球古气候和预测未来气候变化至关重要。来自苏禄海沉积物的浮游有孔虫的氧同位素组成的变化先前已被证明反映了冰川-间冰期和千年时间尺度的行星冰体积的变化，并且已经获得了晚更新世和最后一次冰消期的记录1 -3。在这里，我提出的结果，延长千年的时间分辨率记录回到15万年前。在大约1万年的时间尺度上，苏禄海的氧同位素记录与休恩半岛珊瑚阶地推断的海平面变化相匹配。在同位素第三阶段（23 000至58 000年前的间冰期），苏禄海氧同位素记录偏离SPECMAP深海氧同位素记录5的情况尤其如此。因此，这些结果支持了以下观点4，6，即在第三阶段，海平面比SPECMAP记录所显示的要高，大陆冰要少，而在这次间冰期，海平面仅比现在低40-50米。在恢复到完整的冰川条件期间，大陆冰体积随后的增长速度相应地比以前认为的要快。
THE Sulu Sea is located in the 'warm pool' of the western Pacific Ocean, where mean annual temperatures are the highest of anywhere on Earth. Because this large heat source supplies the atmosphere with a significant portion of its water vapour and latent heat, understanding the climate history of the region is important for reconstructing global palaeoclimate and for predicting future climate change. Changes in the oxygen isotope composition of planktonic foraminifera from Sulu Sea sediments have previously been shown to reflect changes in the planetary ice volume at glacial–interglacial and millenial timeseales, and such records have been obtained for the late Pleistocene epoch and the last deglaciation1–3. Here I present results that extend the millenial time resolution record back to 150,000 years before present. On timescales of around 10,000 years, the Sulu Sea oxygen-isotope record matches changes in sea level deduced from coral terraces on the Huon peninsula4. This is particularly the case during isotope stage 3 (an interglacial period 23,000 to 58,000 years ago) where the Sulu Sea oxygen-isotope record deviates from the SPECMAP deep-ocean oxygen-isotope record5. Thus these results support the idea4,6that there were higher sea levels and less continental ice during stage 3 than the SPECMAP record implies and that sea level during this interglacial was just 40–50 metres below present levels. The subsequent rate of increase in continental ice volume during the return to full glacial conditions was correspondingly faster than previously thought.