Modeling Ice Sheet Evolution on Orbital and Millennial Timescales

AbstractThis支持一个合作项目，其主要目标是模拟轨道和千年尺度的冰盖变化的起源。 该项目将侧重于北半球冰盖的形成、在该频率下没有显著轨道强迫的情况下100千年冰量信号的起源、引起Heinrich事件的冰盖动力学以及冰盖在D/O事件中的作用，最初该项目将侧重于北美冰盖，尽管由此产生的模型将适用于欧亚冰盖。建模策略的指导下，首要的假设，轨道干旱千年尺度的变化冰盖的水文，地质和大气条件的强烈影响，这些条件的忽视是在现有的冰盖模型的不足之处的一个根本来源。该项目将增强参与者开发的现有三维（3英尺）冰盖模型，增加模拟冰流、冰架、冰崩解沿着海洋边缘和冰前湖的组件。在整个模拟过程中，地质记录将用于验证模型输出并指导模型修改

AbstractThis supports a collaborative project whose principal objective is to model the origin of orbital- and millennial-scale variability of ice sheets. The project will focus on the inception of the North Hemisphere ice sheets the origin of the lOO-kyr ice volume signal in the absence of significant orbital forcing at that frequency ice-sheets dynamics that give rise to Heinrich events, and the role of ice sheets in D/O events, initially the project will focus on the North American ice sheets although the resulting model will be applicable to Eurasian ice sheets. The modeling strategy is guided by the overarching hypothesis that orbital- arid millennial-scale variability of ice sheets is strongly influenced by hydrologic, geologic and atmospheric conditions, and that the neglect of these conditions is a fundamental source of deficiency in existing ice-sheet models. The project will enhance an existing three-dimensional (3-ft) ice-sheet model developed by the participants by adding components to simulate ice streams ice shelves, and ice calving along marine margins and proglacial lakes Throughout the simulations, the geological record will be used to validate model output and guide model modifications