Post-Eemian Glacial Inception. Part I: The Impact of Summer Seasonal Temperature Bias
Post-Eemian Glacial Inception. Part I: The Impact of Summer Seasonal Temperature Bias
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后伊米亚冰川开始。
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
W. Peltier
中科院分区：
文献类型：
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作者：
G. Vettoretti;W. Peltier
eemian后冰川开始[海洋氧同位素阶段（MOIS） 5e和MOIS 5d之间的过渡]开始于距今约117,000年前（117kyr BP），并导致在随后的5000年里北半球发生了显著的冰川作用。以往使用大气环流模式（AGCMs）进行的敏感性研究在全球北纬高纬度地区难以产生冰川成核。利用加拿大气候模拟与分析中心（CCCma） GCMII对这一过程进行了基础模拟，并对混合层板状海洋模式进行了约束，以确保该模式再现了现代辐射强迫条件下大气模式比较计划2 （AMIP2）的现代海面温度（SSTs）。该模拟表明，在116 kyr BP进入冰川条件只需要引入后eemian轨道日照和标准的工业化前CO2浓度。两个额外的灵敏度…
Abstract Post-Eemian glacial inception [the transition between marine oxygen isotopic stage (MOIS) 5e and MOIS 5d] began approximately 117 000 years before present (117 kyr BP) and led to significant Northern Hemisphere glaciation within the ensuing 5000 yr. Previous sensitivity studies with atmospheric general circulation models (AGCMs) have had difficulty producing glacial nucleation in high northern latitude regions of the globe. A base simulation of this process has been conducted using the Canadian Centre for Climate Modelling and Analysis (CCCma) GCMII with mixed layer slab ocean model constrained so as to ensure that the model reproduces the set of Atmospheric Model Intercomparison Project 2 (AMIP2) modern sea surface temperatures (SSTs) under conditions of modern radiative forcing. This simulation demonstrates that entry into glacial conditions at 116 kyr BP requires only the introduction of post-Eemian orbital insolation and standard preindustrial CO2 concentrations. Two additional sensitivity ex...