Inclusion of a suite of weathering tracers in the cGENIE Earth system model – muffin release v.0.9.23

Abstract. The metals strontium (Sr), lithium (Li), osmium (Os) and calcium (Ca), together with their isotopes, are important tracers of weathering and volcanism – primary processes which shape the long-term cycling of carbon and other biogeochemically important elements at the Earth's surface. Traditionally, because of their long residence times in the ocean, isotopic shifts in these four elements observed in the geologic record are almost exclusively interpreted with the aid of isotope-mixing, tracer-specific box models. However, such models may lack a mechanistic description of the links between the cycling of the four metals to other geochemically relevant elements, particularly carbon, or climate. Here we develop and evaluate an implementation of Sr, Li, Os and Ca isotope cycling in the Earth system model cGENIE. The model offers the possibility to study the dynamics of these metal systems alongside other more standard biogeochemical cycles, as well as their relationship with changing climate. We provide examples of how to apply this new model capability to investigate Sr, Li, Os and Ca isotope dynamics and responses to environmental change, for which we take the example of massive carbon release to the atmosphere.

摘要。金属锶（Sr）、锂（Li）、锇（Os）和钙（Ca）及其同位素是风化作用和火山活动的重要示踪剂——这些主要过程塑造了地球表面碳及其他具有生物地球化学重要性元素的长期循环。传统上，由于它们在海洋中的停留时间较长，在地质记录中观察到的这四种元素的同位素变化几乎完全借助同位素混合、特定示踪剂的箱式模型来解释。然而，这类模型可能缺乏对这四种金属循环与其他地球化学相关元素（特别是碳或气候）之间联系的机制性描述。在此，我们在地球系统模型cGENIE中开发并评估了锶、锂、锇和钙同位素循环的一种实现方式。该模型提供了研究这些金属系统动态以及其他更标准的生物地球化学循环的可能性，还有它们与气候变化的关系。我们提供了如何应用这种新模型能力来研究锶、锂、锇和钙同位素动态以及对环境变化响应的实例，我们以大量碳释放到大气中为例。