Phanerozoic Chemical Weathering, CO2 Budgets and Global Climate

长期的全球碳循环模型缺乏 地理维度;模型输入和输出受到限制 全球平均值。 百万年时间尺度上的气候变化 可能是由大陆的重新分配及其 风化岩性（因为这会影响大气pCO 2）。 这 该项目将探索中生代气候变化的性质， 进行了几次新的气候模拟 在不同的 相同时间段的pCO 2将阐明 全球气温和径流之间的关系（两个最重要的 影响化学风化速率和pCO 2的变量）。 这些气候变量将用于计算全球气候变化。 风化速率，使用我们在此期间编制的古地质图 以前的研究。 此外，还有两个重要因素， 地形（地貌）和化学物质的生物增强 风化率，将进行评估，使用目前的观测 它们对土壤和溪流化学的影响， 重建古植物地理 本研究的目的 是创造一个现实的，气候和 地球化学循环，可用于调查 古生代气候的地理和时间变化。

Models of the long-term, global carbon cycle have lacked a geographic dimension; model input and output have been restricted to global-mean values. Climate change on million-year time scales can be driven by redistribution of the continents and their weathering lithologies (as this affects atmospheric pCO2). This project will explore the nature of Phanerozoic climate change by performing several new climate simulations. Runs at different pCO2's for the same time periods will elucidate the relationship between global temperature and runoff (the two most important variables affecting chemical weathering rates and thus pCO2). These climate variables will then be used in calculations of global weathering rates, using paleogeologic maps prepared during our previous research. In addition, two other important factors, topography (relief) and biological enhancement of chemical weathering rates, will be assessed, using present-day observations of their affect on soil and stream chemistry, and by assembling and reconstructing paleophytogeographies. The goal of this research is to create a realistic, coupled model of climate and biogeochemical cycles that can be used to investigate the geographic and temporal variability of Phanerozoic climate.