Modeling the Effects of an Ice Sheet on the Climate of a Supercontinent

冈瓦纳冰原的面积大约和 但在一个重要方面有所不同， 位于一个超大陆上 冰的相互作用 在以前的能量中模拟的具有大的季节性周期的表 超大陆结构的平衡模式实验 表明了一种重要的气候反应。 极其 寒冷的温度笼罩着被冰雪覆盖的冈瓦纳超级大陆 再加上温暖的热带纬度， 斜压性，并表明显著的熔融。 这个奖项将 重点研究气候系统的反应， 冈瓦纳冰川期：冈瓦纳冰川作用最大的时期，有大气环流 模型和五种不同的冰川冰范围情景， 米兰科维奇轨道构型。 米兰科维奇的影响 轨道变化将在模拟矩阵中进行探索 利用目前的倾斜对称轨道， 南半球的轨道，和一个炎热的夏季和寒冷的冬季 南半球的轨道。 全球模式分析 循环、温度和水文循环将提供 数据来了解冰川时期的全球气候。 注意模拟的区域冰盖方面 (e.g.地表热量收支，水文循环）将澄清 关于冰川冰盖与冰川的相容性的辩论 超大陆与大的季节性温度范围建议 对于大片的陆地来说。 结果将根据可用的 地质资料

The Gondwanan ice sheets were approximately as large as those in the Pleistocene, but differed in one important respect, they were located on a supercontinent. The interaction of the ice sheet with the large seasonal cycle simulated in previous energy balance model experiments for a supercontinent configuration suggests a response of significant climatic interest. Extremely cold temperatures over the ice-covered supercontinent of Gondwanan coupled to warm tropical latitudes should result in extreme baroclinicity and suggest significant melting. This award will focus research on the climate system response during the time period of maximum Gondwanan glaciation, with a general circulation model and five different scenarios of glacial ice extent and Milankovitch orbital configurations. The influence of Milankovitch orbital variations will be explored in a matrix of simulations using a present tilt-symmetric orbit, a cool summer-warm winter orbit for the Southern Hemisphere, and a hot summer-cold winter orbit for the Southern Hemisphere. Analysis of global patterns of circulation, temperature, and the hydrologic cycle will provide data to understand the global climate during glacial periods. Attention to the regional ice-sheet aspects of the simulations (e.g. surface heat budget, hydrologic cycle) will clarify the debate on the compatibility of a glacial ice sheet on a supercontinent with the large seasonal temperature ranges suggested for large land masses. Results will be validated against available geologic data.