Sea-level fluctuations during the last glacial cycle
Sea-level fluctuations during the last glacial cycle
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DOI：
10.1038/nature01690
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发表时间：
2003-06-19
期刊：
影响因子：
64.8
通讯作者：
Smeed, DA
中科院分区：
文献类型：
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作者：
Siddall, M;Rohling, EJ;Smeed, DA
末次冰期循环的特征是千年尺度的气候波动（1-5），但全球海平面（或相当于冰量）的任何相关变化的程度仍然难以捉摸。海平面的高位可以从过时的珊瑚礁阶地化石中重建出来（6，7），这些数据还得到了基于深海氧同位素比率的全球海平面估计汇编的补充，其分辨率为千年尺度（8）或更高（1）。然而，基于氧同位素的记录包含+/-30米范围内的不确定性，或深海温度的+/-1 ℃（9、10）。在这里，我们分析了红海沉积物岩心的氧同位素记录，以重建红海水停留时间的历史。然后，我们使用红海和世界海洋之间的水交换的水力模型，以获得岩床深度，从而全球海平面-在过去的47万年（470 kyr）。我们的重建是准确的+/-12米，并给出了一个百年尺度的分辨率从70到25 kyr之前。我们发现，海平面的变化高达35米，在高达2厘米/年（-1）的速率，发生，与气候突变。
The last glacial cycle was characterized by substantial millennial-scale climate fluctuations(1-5), but the extent of any associated changes in global sea level (or, equivalently, ice volume) remains elusive. Highstands of sea level can be reconstructed from dated fossil coral reef terraces(6,7), and these data are complemented by a compilation of global sea-level estimates based on deep-sea oxygen isotope ratios at millennial-scale resolution(8) or higher(1). Records based on oxygen isotopes, however, contain uncertainties in the range of +/-30 m, or +/-1degreesC in deep sea temperature(9,10). Here we analyse oxygen isotope records from Red Sea sediment cores to reconstruct the history of water residence times in the Red Sea. We then use a hydraulic model of the water exchange between the Red Sea and the world ocean to derive the sill depth and hence global sea level-over the past 470,000 years (470 kyr). Our reconstruction is accurate to within +/-12 m, and gives a centennial-scale resolution from 70 to 25 kyr before present. We find that sea-level changes of up to 35 m, at rates of up to 2 cm yr(-1), occurred, coincident with abrupt changes in climate.