冷水珊瑚测年与大洋中—深层水碳储库

黄恩清, 孔乐, 田军

Dating Methods of Cold-water Corals and Their Application in Reconstructing Carbon-reservoir Ages of Intermediate and Deep Oceans

Enqing Huang, Le Kong, Jun Tian

图4 0~25 ka BP期间大气CO2浓度及大气Δ14C水平以及变化 (a)大气CO2浓度 [29,30]，在冰消期的Heinrich Stadial 1和新仙女木时期出现CO2浓度的上升；(b)重建的大气Δ14C[17]和模拟的大气Δ14C[32]波动历史比较；其中模拟大气Δ14C水平来自模型BICYCLE的输出结果，假定海洋—大气碳交换速率不变，利用宇宙射线速率波动进行估算；可以看出，重建和模拟结果并不吻合，说明海洋—大气碳交换速率出现过巨大波动

Fig.4 Atmospheric CO2 and Δ14C changes between 25 and 0 ka BP (a) Reconstructed atmospheric CO2 concentrations[29,30], which rose in two stages over the last deglaciation: A first 50×10-6 rise during Heinrich Stadial 1 and a later 25×10-6 rise during the Younger Dryas(YD) interval; (b) A comparison of reconstructed and simulated atmospheric Δ14C changes[17,32]. The model output is from the BICYCLE model, which was forced by changing production rates of cosmic rays and a constant carbon exchange rate between the atmosphere and the ocean. The offset between the reconstruction and the simulation suggests a significant change in the carbon exchange rate between the atmosphere and the ocean in the past