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首页> 外文期刊>Paleoceanography >North American continental margin records of the Paleocene-Eocene thermal maximum: Implications for global carbon and hydrological cycling
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North American continental margin records of the Paleocene-Eocene thermal maximum: Implications for global carbon and hydrological cycling

机译：北美大陆古新世-始新世热最大值的边缘记录：对全球碳和水文循环的影响

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摘要

The impacts of the Paleocene-Eocene thermal maximum (PETM) (similar to 55 Ma), one of the most rapid and extreme warming events in Earth history, are well characterized in open marine and terrestrial environments but are less so on continental margins, a major carbon sink. Here, we present stable isotope, carbonate content, organic matter content, and C: N ratio records through the PETM from new outcrop sections in California and from cores previously drilled on the New Jersey margin. Foraminifer delta O-18 data suggest that midlatitude shelves warmed by a similar magnitude as the open ocean (5 degrees C-8 degrees C), while the carbon isotope excursion (CIE), recorded both in carbonate and organic matter delta C-13 records, is slightly larger (3.3-4.5%) than documented in open ocean records. Sediment accumulation rates increase dramatically during the CIE in marked contrast to the open ocean sites. In parallel, mass accumulation rates of both organic and inorganic carbon also increased by an order of magnitude. The estimated total mass of accumulated carbon in excess of pre-CIE rates suggests that continental margins, at least along North America, became carbon sinks during the CIE, mainly because of weathering feedbacks and rising sea level. This result is significant because it implies that the negative feedback role of carbon burial on continental margins was greater than previously recognized.
机译：古新世-始新世最大温度（PETM）（约55 Ma）的影响是地球历史上最快速，最极端的变暖事件之一，在开放的海洋和陆地环境中具有明显的特征，但在大陆边缘则较少。主要碳汇。在这里，我们通过PETM展示了加利福尼亚新露头部分以及之前在新泽西边缘钻探的岩心的稳定同位素，碳酸盐含量，有机质含量和C：N比记录。有孔虫三角洲O-18数据表明，中纬度陆架的升温幅度与公海（5摄氏度至8摄氏度）相似，而碳同位素偏移（CIE）记录在碳酸盐和有机物三角洲C-13记录中，比公海记录中的记录稍大（3.3-4.5％）。与开阔的海洋站点形成鲜明对比的是，在CIE期间泥沙积累速率急剧增加。同时，有机碳和无机碳的质量累积率也增加了一个数量级。估计的累积碳总量超过了CIE之前的比率，这表明，至少由于北美地区，大陆边缘成为CIE期间的碳汇，主要是由于天气反馈和海平面上升。该结果之所以有意义，是因为它暗示了埋在大陆边缘的碳的负反馈作用要大于以前的认识。

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