Into and out of the Last Glacial Maximum: sea-level change during Oxygen Isotope Stages 3 and 2
Into and out of the Last Glacial Maximum: sea-level change during Oxygen Isotope Stages 3 and 2
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DOI：
10.1016/s0277-3791(01)00071-3
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发表时间：
2002-01-01
影响因子：
4
通讯作者：
Purcell, T
中科院分区：
文献类型：
--
作者：
Lambeck, K;Yokoyama, Y;Purcell, T
来自七个不同地区的海平面数据已被用于估计进入和离开末次冰期最大期（LGM）的时间间隔内海洋和冰量的全球变化。这些估计值依赖于地球模型，选择的参数使每个区域的个别估计值之间的差异最小化。主要结论是：（1）冰量在30000年前达到最大值，并在19000年前基本保持不变;这就定义了全球最大冰川期。(ii)末次冰期后海平面上升的特点是速率的变化，最大速率约为15毫米/年，发生在16，000年至12，500年前，再次发生在11，500年至9000年前。在这两个快速上升时期之间的时间间隔内，对应于新仙女木，冰量几乎是恒定的。(iii)在末次盛冰期结束时的融化的特点是，在大约500年的时间里，最初的速度很高，然后是大约2500年的海洋体积相对缓慢的增加。(iv)进入LGM的铅的特点是在几千年内发生的海平面下降约50米。在氧同位素第3阶段的早期，海平面的下降和上升速率相似。(C)2001爱思唯尔科技有限公司版权所有。
Sea-level data from seven different regions have been used to estimate the global change in ocean and ice volumes for the time interval leading into and out of the Last Glacial Maximum (LGM). The estimates are earth-model dependent and parameters are chosen that minimize discrepancies between the individual estimates for each region. Good coherence between estimates from different localities has been found. The main conclusions are: (i) Ice volumes approached their maximum values 30 000 (calendar) years ago and remained nearly constant until 19 000 years ago. This defines the period of maximum global glaciation. (ii) The post-LGM sea-level rise is marked by changes in rates with maximum rates of about 15 mm/year occurring from 16,000 to 12,500 years ago and again from 11,500 to 9000 years ago. Ice volumes in the interval between these two periods of rapid rise, corresponding to the Younger Dryas, is nearly constant. (iii) The melting at the end of the LGM is characterized by an initially high rate over about 500 years followed by about 2500 years of a comparatively slow increase in ocean volume. (iv) The lead into the LGM is characterized by a sea-level fall of about 50 m occurring within a few thousand years. Similar rates of falling and rising sea levels occur during the earlier part of the oxygen isotope stage 3 interval. (C) 2001 Elsevier Science Ltd. All rights reserved.