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

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δ13C（δ13C）重建结果相契合的碳循环演化过程。在此过程中，部分模拟情景下的模型会被预设δ13C数据，或以δ13C数据进行nudging（松弛逼近）约束。后续可通过后处理流程对模型内部的13C循环开展必要校正，以此评估模型外部的地质碳源（如火山释放的CO₂或碳酸盐岩风化过程）的δ13C特征，是否为驱动模型调整以匹配观测数据的核心诱因。本数据集源自9组模拟情景，单组情景的时长介于21万年（kyr）至5百万年（Myr）之间。