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5 根据冷水珊瑚和有孔虫重建的2.5万年以来中深层海洋碳储库年龄变化 (a)冷水珊瑚和深海沉积物站位图，背景为工业革命之前的海水Δ14C值[57]；(b),(c)冷水珊瑚估算的赤道大西洋和德雷克海峡中—深层海水ΔΔ14C值变化[37,58]；(d),(e)有孔虫估算的南大洋深部水团ΔΔ14C值变化[36,59]；(f)重建的大气Δ14C波动历史[17]；ΔΔ14C表示海水与大气Δ14C值的差值；注意Heinrich Stadial 1事件结束时(约1.46万年前)，不同深度海水ΔΔ14C值均出现大幅度下降

Fig.5 Changes of intermediate-deep ocean carbon reservoirs ages between 25 and 0 ka BP, derived from cold-water coral and foraminifera (a) Geographic locations and water depths of coral samples and sediment cores, plotted against the pre-industrial distribution of seawater Δ14C values[57]； (b),(c) Reconstructed intermediate-deep ocean ΔΔ14C values in the equatorial tropical Atlantic and the Drake Strait, derived from cold-water coral samples[37,58]； (d),(e) Reconstructed ΔΔ14C values of the deep Southern Ocean, derived from foraminiferal samples[36,59]； (f) Reconstructed atmospheric Δ14C changes[17]； ΔΔ14C indicates the Δ14C value offset between the contemporary ocean and atmosphere； Note a significant decline of ΔΔ14C values at different water depths occurred at the end of the Heinrich Stadial 1 (about 14.6 ka BP)