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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Transient ocean warming and shifts in carbon reservoirs during the early Danian
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Transient ocean warming and shifts in carbon reservoirs during the early Danian

机译：达尼安早期的短暂海洋变暖和碳储集层的变化

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A long-standing question in Paleogene climate concerns the frequency and mechanism of transient greenhouse gas-driven climate shifts (hyperthermals). The discovery of the greenhouse gas-driven Paleocene-Eocene Thermal Maximum (PETM; similar to 55 Ma) has spawned a search for analogous events in other parts of the Paleogene record. On the basis of high-resolution bulk sediment and foraminiferal stable isotope analyses performed on three lower Danian sections of the Atlantic Ocean, we report the discovery of a possible greenhouse gas-driven climatic event in the earliest Paleogene. This event-that we term the Dan-C2 event-is characterized by a conspicuous double negative excursion in delta C-13 and delta O-18, associated with a double spike in increased clay content and decreased carbonate content. This suggests a double period of transient greenhouse gas-driven warming and dissolution of carbonates on the seafloor analogous to the PETM in the early Paleocene at similar to 65.2 Ma. However, the shape of the two negative carbon isotope excursions that make up the Dan-C2 event is different from the PETM carbon isotope profile. In the Dan-C2 event, these excursions are fairly symmetrical and each persisted for about similar to 40 ky and are separated by a short plateau that brings the combined duration to similar to 100 ky, suggesting a possible orbital control on the event. Because of the absence of a long recovery phase, we interpret the Dan-C2 event to have been associated with a redistribution of carbon that was already in the biosphere. The Dan-C2 event and other early Paleogene hyperthermals such as the short-lived early Eocene ELMO event may reflect amplification of a regular cycle in the size and productivity of the marine biosphere and the balance between burial of organic and carbonate carbon. (C) 2007 Elsevier B.V. All rights reserved.
机译：在古近代气候中，一个长期存在的问题与瞬态温室气体驱动的气候变化（高热）的频率和机理有关。温室气体驱动的古新世-始新世热最大值（PETM;类似于55 Ma）的发现催生了对古近纪记录其他部分类似事件的搜索。在高分辨率的大量沉积物和有孔虫的稳定同位素分析的基础上，我们对大西洋的三个大下部区域进行了分析，我们报告了最早的古近纪中可能存在的温室气体驱动的气候事件的发现。此事件（我们称为Dan-C2事件）的特征是，δC-13和δO-18出现明显的双重负偏移，与粘土含量增加和碳酸盐含量下降的双重峰值相关。这表明类似于古新世早期的PETM，类似于65.2 Ma，是温室气体驱动的短暂瞬态变暖和海底碳酸盐溶解的两倍。但是，构成Dan-C2事件的两个负碳同位素偏移的形状与PETM碳同位素分布图不同。在Dan-C2事件中，这些偏移是相当对称的，并且每个持续约40 ky，并由一个短暂的平稳期隔开，使合并的持续时间类似于100 ky，这表明可能对该事件进行轨道控制。由于缺乏漫长的恢复阶段，我们将Dan-C2事件解释为与生物圈中已经存在的碳重新分配有关。 Dan-C2事件和其他早期古近纪高温事件，例如寿命短的始新世ELMO事件，可能反映了海洋生物圈规模和生产力的规则循环放大以及埋葬有机碳酸盐和碳酸盐碳之间的平衡。 （C）2007 Elsevier B.V.保留所有权利。

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