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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 >Influence of climate and hydrology on carbon in an early Miocene peatland
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Influence of climate and hydrology on carbon in an early Miocene peatland

机译：气候和水文学对中新世早期泥炭地碳的影响

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Our understanding of the hydrodynamic response of peatland to climate change is restricted to the Holocene, which confines our knowledge of the fundamental controls on this important carbon reservoir to recent sedimentary successions. To understand the interaction of peatland hydrodynamics, climate and the carbon cycle on longer time scales, a 95.4 in record from lower Miocene lignite from the Gippsland Basin, Australia is considered. delta C-13 and colour records for the lignite were created by analysing samples every 0.1 in. Solid-state C-13 NMR results indicate that lignite colour is related to the relative abundance of aliphatic carbon. The lack of a direct correlation between colour and delta C-13 demonstrates that the delta C-13 signal has not been significantly influenced by the diagenetic processes that produce the colour. An offset correlation occurs between delta C-13 and colour with the degree of offset decreasing from 4.5 m at the base to about 0 in at the top. This offset is considered to represent a zone of surface influence that extends up to 20 m below the peat surface. Using numerical modelling we demonstrate that this zone of surface influence and its gradual decline in thickness could arise as a consequence of enhanced fluid flow in regions of high tensile stress within the unconfined peat body. The removal of lignin and its derivatives from the zone of surface influence will be favoured by cooler drier periods. with lower sea level and high hydraulic gradients across the peatland. Therefore in the early Miocene this peatland acted as a carbon source during global cooling. (c) 2006 Elsevier B.V. All rights reserved.
机译：我们对泥炭地对气候变化的水动力响应的理解仅限于全新世，这使我们对这个重要的碳储层的基本控制的知识仅限于最近的沉积演替。为了了解泥炭地的水动力，气候和碳循环在更长的时间尺度上的相互作用，考虑了澳大利亚吉普斯兰盆地中下新世褐煤的95.4记录。褐煤的δC-13和颜色记录是通过每0.1英寸分析一次样品而创建的。固态C-13 NMR结果表明褐煤的颜色与脂肪族碳的相对丰度有关。颜色与增量C-13之间缺乏直接相关性说明，增量C-13信号并未受到产生颜色的成岩过程的显着影响。偏移量C-13与颜色之间存在偏移量相关性，偏移量的程度从底部的4.5 m减少到顶部的大约0 in。该偏移量被认为代表了一个表面影响区域，该区域延伸至泥炭表面以下20 m。使用数值模型，我们证明了该表面影响区域及其厚度的逐渐减小可能是由于无约束泥炭体内高拉应力区域中流体流动增强的结果。较冷的干燥期有利于从表面影响区域除去木质素及其衍生物。较低的海平面和整个泥炭地的高水力梯度。因此，在中新世早期，泥炭地在全球降温期间充当了碳源。 （c）2006 Elsevier B.V.保留所有权利。

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