Simulation of long eccentricity (400-kyr) cycle in ocean carbon reservoir during Miocene Climate Optimum: Weathering and nutrient response to orbital change
Simulation of long eccentricity (400-kyr) cycle in ocean carbon reservoir during Miocene Climate Optimum: Weathering and nutrient response to orbital change
复制标题
中新世气候最佳状态下海洋碳库长偏心率（400-kyr）循环的模拟：风化和营养对轨道变化的响应
DOI：
10.1029/2011gl047680
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发表时间：
2011-05-20
影响因子：
5.2
通讯作者：
Wang, Pinxian
中科院分区：
文献类型：
--
作者：
Ma, Wentao;Tian, Jun;Wang, Pinxian
深海有孔虫三角洲C-13记录包含丰富的400-kyr旋回，表明偏心率强迫与海洋碳储层变化之间存在联系。本文采用箱形模型模拟了中新世气候最适期（MCO, 17-14 Ma）地球轨道几何形状所导致的海洋三角洲C-13极大期事件。表层和深水三角洲C-13的模拟结果均显示400-kyr共变周期。在轨道参数的调节下，风化碳输入会改变碳酸盐岩与有机碳的埋藏比，从而导致大洋三角洲C-13的周期性变化。河流养分输入的增加与河流碳输入同步，往往会刺激初级生产力和有机碳的埋藏。离心率的极大值（极小值）增强（减弱）风化强度和营养供给，从而导致δ C-13的极小值（极大值）。海洋碳库突出的400-kyr循环被解释为可能是由于海洋中碳的长期记忆造成的。引用本文：马伟，田健，李强，王平（2011），中新世气候最适期海洋碳库长偏心率（400-kyr）周期模拟：轨道变化的风化和营养响应，地球物理学报。卷。科学通报，38,L10701, doi:10.1029/2011GL047680。
Deep-sea foraminiferal delta C-13 records contain abundant 400-kyr cycles indicating a link between eccentricity forcing and ocean carbon reservoir change. Here we simulate the oceanic delta C-13 maxima events forced by the Earth's orbital geometry during the Miocene Climate Optimum (MCO, 17-14 Ma) using a box model. The simulated results of both surface and deep water delta C-13 display co-varying 400-kyr cycle. Modulated by orbital parameters, weathering induced carbon input will change the burial ratio of carbonates to organic carbon and further result in periodic changes in the oceanic delta C-13. The increase of riverine nutrient input, which is synchronous with riverine carbon input, often stimulates primary productivity and burial of organic carbon. Our results support that eccentricity maxima (minima) enhance (reduce) weathering intensity and nutrient supply, which lead to minima (maxima) of delta C-13. The prominent 400-kyr cycle of ocean carbon reservoir is interpreted as likely caused by a long memory of carbon in the ocean. Citation: Ma, W., J. Tian, Q. Li, and P. Wang (2011), Simulation of long eccentricity (400-kyr) cycle in ocean carbon reservoir during Miocene Climate Optimum: Weathering and nutrient response to orbital change, Geophys. Res. Lett., 38, L10701, doi:10.1029/2011GL047680.