Ice sheet and terrestrial input impacts on the 100-kyr ocean carbon cycle during the Middle Miocene
Ice sheet and terrestrial input impacts on the 100-kyr ocean carbon cycle during the Middle Miocene
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中中新世期间冰盖和陆地输入对 100 kyr 海洋碳循环的影响
DOI：
10.1016/j.gloplacha.2021.103723
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发表时间：
2021-12
影响因子：
3.9
通讯作者：
Enqing Huang
中科院分区：
文献类型：
--
作者：
Xiaolin Ma;Wentao Ma;Jun Tian;Jimin Yu;Enqing Huang
中新世中期（~ 16-11.6 Ma）的大气co2水平与现在相当，因此中新世中期气候系统与碳循环相互作用的控制机制可能对未来的气候变化具有重要意义。本文研究了晚第四纪和中中新世100 kyr波段底栖有孔虫δ18O和δ13C的相关系。结果表明，中中新世底栖有孔虫δ18O和δ13C在100 kyr波段具有高度相干和同相关系，而晚第四纪则相反。然而，造成这种反差的原因仍然难以捉摸。利用生物地球化学盒模型探讨了中中新世100-kyr波段的相关系机制。模式结果表明，这种同相关系可归因于两种机制：(1)在100 kyr波段内，由南极冰盖的生长和衰减引起的海平面波动调节的陆架-盆地碳酸盐位移；(2)在偏心率调制的岁差带内，受低纬度降水变率调节的河流养分排放驱动的陆地碳输入和生物泵的变化。因此，我们认为在100 kyr波段内，高、低纬度过程在中中新世碳循环中都发挥了关键作用。研究进一步表明，化学风化在中中新世轨道时间尺度上对大气co2具有潜在的调节作用。
The Middle Miocene (~16–11.6 Ma) had atmospheric CO2levels comparable to the present day, and thus the mechanisms controlling the interactions of the climate system and the carbon cycle during the Middle Miocene may have significant implications for future climate change. In this study, we examined the phase relationship between benthic foraminiferal δ18O and δ13C records, within the 100-kyr band, during the Late Quaternary and the Middle Miocene. Our results suggest that benthic foraminiferal δ18O and δ13C were highly coherent and in-phase within the 100-kyr band during the Middle Miocene, in contrast to the anti-phased relationship during the Late Quaternary. However, the causes of this contrast remain elusive. We used a biogeochemical box model to explore the mechanisms of the in-phase relationship in the 100-kyr band during the Middle Miocene. The model results show that the in-phase relationship can be attributed to two mechanisms: (1) a shelf-basin carbonate shift regulated by sea-level fluctuations which originated from the growth and decay of the Antarctic ice sheet, within the 100-kyr band; and (2) changes in terrestrial carbon inputs and the biological pump driven by the discharge of riverine nutrients, which was regulated by precipitation variability in low latitudes, within the eccentricity-modulated precessional band. Thus, we propose that both high- and low-latitude processes played critical roles in the Middle Miocene carbon cycle, within the 100-kyr band. We further show that chemical weathering played a potential role in regulating the atmosphericpCO2on the orbital time scale during the Middle Miocene.
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