Sedimentary evidence for enhanced hydrological cycling in response to rapid carbon release during the early Toarcian oceanic anoxic event
Sedimentary evidence for enhanced hydrological cycling in response to rapid carbon release during the early Toarcian oceanic anoxic event
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DOI：
10.1016/j.epsl.2017.10.030
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发表时间：
2018-01-01
影响因子：
5.3
通讯作者：
Inui, Mutsuko
中科院分区：
文献类型：
--
作者：
Izumi, Kentaro;Kemp, David B.;Inui, Mutsuko
在早期Toarcian（类似于183 Ma）期间生物圈碳的碳同位素组成和同时代海水变暖的明显偏移与C-12富集碳向海洋和大气的大规模转移有关。欧洲对可用数据分布的偏见意味着这种碳循环扰动的精确模式、克里思和全球表达以及相关的环境响应仍然不确定。在这里，我们提出了一个新的厘米尺度的陆地为主的碳同位素记录，通过扩大下托阿西亚节从日本，显示类似于从欧洲记录的海洋和陆地碳同位素记录的负漂移模式。这些新数据表明，富含C-12的碳至少在一次快速的千年尺度的脉冲中被添加到生物圈中。沉积学分析表明，碳同位素漂移与高能输沙和河流流量增加密切相关。总之，这些数据支持这样一种假设，即全球水文循环的突然加强是对快速碳释放和大气变暖的直接和即时反应。(C)2017爱思唯尔B. V.保留所有权利。
A pronounced excursion in the carbon-isotope composition of biospheric carbon and coeval seawater warming during the early Toarcian (similar to 183 Ma) has been linked to the large-scale transfer of C-12-enriched carbon to the oceans and atmosphere. A European bias in the distribution of available data means that the precise pattern, tempo and global expression of this carbon cycle perturbation, and the associated environmental responses, remain uncertain. Here, we present a new cm-scale terrestrial dominated carbon-isotope record through an expanded lower Toarcian section from Japan that displays a negative excursion pattern similar to marine and terrestrial carbon-isotope records documented from Europe. These new data suggest that C-12-enriched carbon was added to the biosphere in at least one rapid, millennial-scale pulse. Sedimentological analysis indicates a close association between the carbon isotope excursion and high-energy sediment transport and enhanced fluvial discharge. Together, these data support the hypothesis that a sudden strengthening of the global hydrological cycle occurred in direct and immediate response to rapid carbon release and atmospheric warming. (C) 2017 Elsevier B.V. All rights reserved.