COLLABORATIVE RESEARCH: Determining Transient Physical Conditions Under the Southern Laurentide Ice Sheet Using Geologic Information and Numerical Modeling

9814371 Mickelson使用地质信息和数值模拟确定南洛伦蒂冰盖下的瞬时物理条件，作者是David M.Mickelson和Paul Cutler(威斯康星大学地质和地球物理系)，Douglas R.MacAyeal(芝加哥大学地球物理科学系)和Patrick M.Colgan(东北大学地质系)。通过将冰川地质记录与冰盖数值模拟相结合，我们将重建威斯康星州晚期南部劳伦蒂德冰盖(SLIS)的动力学和冰下环境。我们之所以关注SLI，是因为从北到南的地貌组合存在明显的反差，而且冰盖的记录在时间和空间上都有很好的记录。数据将在地理信息系统中进行组织和分析。我们的冰盖模型是二维的，与时间相关，除了覆盖的冰之外，还包括了地下1公里的上部。该模型将通过增加一个“地质包”来适应于处理基础/地下过程。这将包括永久冻土的处理、水文学、基本运动和耕作动力学。这种建模将有助于我们了解大湖区冰川地貌的形成条件。

9814371MickelsonDetermining Transient Physical Conditions under the Southern Laurentide IceSheet Using Geologic Information and Numerical Modeling by David M. Mickelson and Paul Cutler (Department of Geology and Geophysics, University of Wisconsin, Douglas R. MacAyeal (Department of Geophysical Sciences, University of Chicago) and Patrick M. Colgan (Department of Geology, Northeastern University). We will reconstruct the dynamics and subglacial environment of the southern Laurentide Ice Sheet (SLIS) during the late Wisconsin by integrating the glacial geologic record with numerical ice-sheet modeling. We focus on the SLIS because there are striking contrasts in landform assemblages from north to south, and the record of ice sheets is well documented in time and space. Data will be organized and analyzed in a geographic information system. Our ice-sheet model is two-dimensional, time-dependent, and incorporates the upper 1-km of the subsurface in addition to overlying ice. The model willbe adapted to handle basal/subsurface processes by adding a 'geologic package'. This will include treatment of permafrost, hydrology, basal motion and till dynamics. This modeling will help us understand the conditions of formation of the glacial landscape of the Great Lakes area.