Enhanced sulfate consumption fueled by deep-sourced methane in a hydrate-bearing area
Enhanced sulfate consumption fueled by deep-sourced methane in a hydrate-bearing area
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含水合物区域的深源甲烷导致硫酸盐消耗增加
DOI：
10.1016/j.scib.2021.09.006
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发表时间：
2022
期刊：
影响因子：
18.9
通讯作者：
Duofu Chen
中科院分区：
文献类型：
--
作者：
Yu Hu;Xinxin Zhang;Dong Feng;Jörn Peckmann;Junxi Feng;Hongbin Wang;Shengxiong Yang;Duofu Chen
硫酸盐还原是海洋沉积物中普遍存在的微生物过程，也是海洋沉积物中有机物氧化的重要途径；后者过程被称为有机碎屑硫酸盐还原（OSR）。然而，微生物硫酸盐还原也充当海洋沉积物中的甲烷屏障，通过硫酸盐驱动的甲烷厌氧氧化（AOM）阻止了90%以上渗出的甲烷（一种强大的温室气体）进入海洋。有效的甲烷汇，大量甲烷释放事件被认为是地质过去极端气候变化的触发因素。硫酸盐还原，无论是OSR还是AOM形式，都会产生溶解的碳酸氢盐，通常会增加孔隙水碱度并诱导自生碳酸盐的形成。海洋沉积物中硫酸盐还原产生的自生碳酸盐被认为在古代海洋的碳循环中发挥了关键作用，并且在今天仍然如此。因此，了解全球分布和分布至关重要硫酸盐减少的幅度及其在海洋碳和硫循环中的作用。
Sulfate reduction is a ubiquitous microbial process and an important pathway for organic matter oxidation in marine sediments;the latter process is referred to as organoclastic sulfate reduction (OSR).Yet,microbial sulfate reduction also serves as a methane barrier in marine sediments,preventing the ingress of more than 90% of the seeping methane,a powerful greenhouse gas,into the ocean through sulfate-driven anaerobic oxidation of methane (AOM).Despite of AOM representing an efficient methane sink,large methane release events have been suggested as triggers of extreme climate change in the geological past.Sulfate reduction,either in the form of OSR or AOM,produces dissolved bicarbonate,typically increasing pore-water alkalinity and inducing the formation of authigenic carbonates.Authigenic carbonate resulting from sulfate reduction in marine sediments is believed to have played a key role in the carbon cycle in ancient oceans and still does so today.Therefore,it is crucial to understand the global distribution and magnitude of sulfate reduction and its role in oceanic carbon and sulfur cycling.