Carbon cycle model simulations using BICYCLE-SE over the last 5 millions years with focus on the 405-kyr periodicities in 13C

Using the carbon cycle model BICYCLE-SE I simulated carbon cycle changes that tried to agree with marine δ13C reconstructions. In doing so the model is in some scenarios prescribed with δ13C data, or nudged to δ13C data. Necessary corrections in the model-internal 13C cycle can in post-processing be used to evaluate if the δ13C signature of geological carbon sources (volcanic CO2 or carbonate rock weathering) external to the model might be responsible for the necessary changes that align the model with the data. The data are obtained from 9 simulation scenarios, which are between 210 kyr and 5 Myr long.

本研究采用碳循环模型BICYCLE-SE，模拟了旨在与海洋碳同位素δ¹³C（δ¹³C）重建结果相匹配的碳循环演化过程。在此过程中，部分模拟场景下的模型被施加δ¹³C数据作为约束，或通过张弛同化（nudging）方法向δ¹³C数据校准。我们可在后期处理阶段，通过对模型内部的¹³C循环开展必要校正，以此评估模型域外的地质碳源（如火山释放的CO₂或碳酸盐岩风化作用）所携带的δ¹³C信号，是否为推动模型与观测数据实现匹配所需调整的成因。本研究所用数据来自9组模拟场景，模拟时长介于210千年（kyr）至5百万年（Myr）之间。