Dominance of benthic fluxes in the oceanic beryllium budget and implications for paleo-denudation records.
Dominance of benthic fluxes in the oceanic beryllium budget and implications for paleo-denudation records.
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DOI：
10.1126/sciadv.adg3702
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发表时间：
2023-06-09
期刊：
影响因子：
13.6
通讯作者：
Vance, Derek
中科院分区：
文献类型：
--
作者：
Deng, Kai;Rickli, Jorg;Suhrhoff, Tim Jesper;Du, Jianghui;Scholz, Florian;Severmann, Silke;Yang, Shouye;McManus, James;Vance, Derek
海洋沉积物中大气来源的10 Be与大陆来源的9 Be的比值已被用来探讨大陆剥蚀与气候之间的长期关系。然而，它的应用是复杂的不确定性9 Be通过陆地-海洋界面转移。河流溶解负荷本身是不足以关闭海洋9 Be预算，主要是由于大量去除河流9 Be大陆边缘沉积物。我们关注的是后者的最终命运。我们提出了沉积物孔隙水被配置文件从不同的大陆边缘环境量化成岩被释放到海洋。我们的研究结果表明，孔隙水的Be循环主要是由颗粒供应和Mn-Fe循环，导致较高的底栖生物通量的架子。底栖通量可能有助于关闭9 Be预算，至少相当于或高于（~2倍），河流溶解输入。这些意见需要一个修订的模型框架，它认为潜在的主导底栖来源，有力地解释海洋Be同位素记录。海洋沉积物的底栖通量主导海洋Be预算，复杂的使用10 Be/9 Be作为古剥蚀示踪剂。
The ratio of atmosphere-derived 10Be to continent-derived 9Be in marine sediments has been used to probe the long-term relationship between continental denudation and climate. However, its application is complicated by uncertainty in 9Be transfer through the land-ocean interface. The riverine dissolved load alone is insufficient to close the marine 9Be budget, largely due to substantial removal of riverine 9Be to continental margin sediments. We focus on the ultimate fate of this latter Be. We present sediment pore-water Be profiles from diverse continental margin environments to quantify the diagenetic Be release to the ocean. Our results suggest that pore-water Be cycling is mainly controlled by particulate supply and Mn-Fe cycling, leading to higher benthic fluxes on shelves. Benthic fluxes may help close the 9Be budget and are at least comparable to, or higher (~2-fold) than, the riverine dissolved input. These observations demand a revised model framework, which considers the potentially dominant benthic source, to robustly interpret marine Be isotopic records. Benthic fluxes from ocean sediments dominate the oceanic Be budget, complicating the use of 10Be/9Be as a paleo-denudation tracer.
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