Characterizing ice sheets during the Pliocene: evidence from data and models
Characterizing ice sheets during the Pliocene: evidence from data and models
复制标题
描述上新世冰盖的特征：来自数据和模型的证据
DOI：
10.1144/tms002.24
复制
发表时间：
2007
影响因子：
4.1
通讯作者：
P. Valdes
中科院分区：
文献类型：
--
作者：
D. J. Hill;A. Haywood;R. Hindmarsh;P. Valdes
上新世（C。5.3-180万年BP）是地质时代的最后一个时期，在这个时期，全球气温普遍高于现代。如果我们要了解温暖气候的动态，这一点很重要。气候和冰冻圈的相互作用尤其如此，上新世可能代表了冰盖（至少在南极洲）成为永久特征的第一个时代。在本文中，我们回顾了上新世冰盖状态的现有证据，以及以前的尝试来模拟它们。然后，我们提出了新的模型和敏感性研究中上新世东南极冰盖（EAIS），并考虑在上新世冰盖稳定性的辩论的影响。这些新的重建表明，上新世中期的EAIS明显小于现代，但模拟的上新世中期平均气候不足以导致天狼星组硅藻证据所建议的广泛的冰川消退。
The Pliocene (c. 5.3 - 1.8 Myr BP) was the last epoch of geological time in which global temperatures were generally higher than modern. It is important if we are to understand the dynamics of warm climates. This is particuarly true of the interaction of climate and cryosphere, where the Pliocene may represent the first epoch in which ice sheets, at least on Antarctica, were a permanent feature. In this paper, we review the available evidence for the state of ice sheets during the Pliocene as well as previous attempts to model them. We then present new models and sensitivity studies of the mid-Pliocene East Antarctic Ice Sheet (EAIS) and consider the implications for the debate on ice-sheet stability during the Pliocene. These new reconstructions suggest that the mid-Pliocene EAIS was significantly smaller than modern, but the modelled average mid-Pliocene climate is not sufficient to cause the widespread deglaciation suggested by Sirius Group diatom evidence.