Coupled Models of Geochemical Cycles and Climate

地球化学旋回与气候耦合模式要理解地球化学旋回，必须将全球气候和地球化学模式结合起来。这些模型独立运行后，对古环境条件作出了一致的预测。然而在本质上，它们是动态耦合的。气候是大气中二氧化碳含量的一个函数，在数百万年的时间里，大气中的二氧化碳含量是由沉积岩脱碳过程中产生的二氧化碳和地壳风化过程中消耗的二氧化碳的平衡所控制的。另一方面，风化速率取决于温度和降雨量。建模将处理这种耦合的性质和影响。第一年将研究气候对化学风化速率的影响。在第二年，一个风化速率子程序将与气候模式相结合，计算出平衡CO2压力，目的是分析气候、风化和大气CO2之间反馈的重要性和关系。

Coupled Models of Geochemical Cycles and Climate Global models of climate and geochemistry must be integrated in order to understand geochemical cycles. Operated independently, these models have made concordant predictions of paleoenvironmental conditions. Yet in nature, the are dynamically coupled. Climate is a function of the CO2 content of the atmosphere, which is controlled over millions of years by the balance of production during the decarbonation of sedimentary rocks and consumption during crustal weathering. Weathering rates, on the other hand, are dependent on temperature and rainfall. The modelling will address the nature and impact of this coupling. The first year will study the effect of climate on chemical weathering rates. In the second year a weathering rate subroutine will be integrated with the climate model, a equilibrium CO2 pressure calculated, with the objective of analyzing the importance of feedbacks and relationships between climate, weathering, and atmospheric CO2.