Rapid shifts in circulation and biogeochemistry of the Southern Ocean during deglacial carbon cycle events.
Rapid shifts in circulation and biogeochemistry of the Southern Ocean during deglacial carbon cycle events.
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DOI：
10.1126/sciadv.abb3807
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发表时间：
2020-10
期刊：
影响因子：
13.6
通讯作者：
Spooner PT
中科院分区：
文献类型：
--
作者：
Li T;Robinson LF;Chen T;Wang XT;Burke A;Rae JWB;Pegrum-Haram A;Knowles TDJ;Li G;Chen J;Ng HC;Prokopenko M;Rowland GH;Samperiz A;Stewart JA;Southon J;Spooner PT
绝对定年的深海珊瑚δ 14 C、δ 11 B和δ 15 N记录揭示了南大洋在快速冰消期碳循环事件中的作用。南大洋在百年至千年的时间尺度上对调节大气中的二氧化碳起着至关重要的作用。然而，缺乏足够分辨率的观测来探讨这一点。在这里，我们报告的高分辨率，多代理记录的基础上，从南大洋的深海珊瑚精确日期。成对的深部（δ 14 C和δ 11 B）和地表（δ 15 N）代用数据表明，在1.46万年和1.17万年前，上升流增强，生物泵效率降低，这将促进碳快速释放到大气中。在16.3和12.8 ka前，在南大洋深处的异常良好的通风沃茨的瞬态期间发生。同期的大气碳记录表明，这些南大洋通风事件也是重要的释放碳从深海呼吸到大气中。因此，我们的研究结果突出了两种不同的模式，南大洋环流和地球化学与百年尺度的大气CO2跳跃在最后一次冰消期。
Absolutely dated deep-sea coral ∆14C, δ11B, and δ15N records reveal Southern Ocean’s role in rapid deglacial carbon cycle events. The Southern Ocean plays a crucial role in regulating atmospheric CO2 on centennial to millennial time scales. However, observations of sufficient resolution to explore this have been lacking. Here, we report high-resolution, multiproxy records based on precisely dated deep-sea corals from the Southern Ocean. Paired deep (∆14C and δ11B) and surface (δ15N) proxy data point to enhanced upwelling coupled with reduced efficiency of the biological pump at 14.6 and 11.7 thousand years (ka) ago, which would have facilitated rapid carbon release to the atmosphere. Transient periods of unusually well-ventilated waters in the deep Southern Ocean occurred at 16.3 and 12.8 ka ago. Contemporaneous atmospheric carbon records indicate that these Southern Ocean ventilation events are also important in releasing respired carbon from the deep ocean to the atmosphere. Our results thus highlight two distinct modes of Southern Ocean circulation and biogeochemistry associated with centennial-scale atmospheric CO2 jumps during the last deglaciation.
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