Deng, Kai, Rickli, Jörg, Suhrhoff, Tim Jesper, Du, Jianghui, Scholz, Florian , Severmann, Silke, Yang, Shouye, McManus, James and Vance, Derek (2023) Dominance of benthic fluxes in the oceanic beryllium budget and implications for paleo-denudation records. Science Advances, 9 (23). Art.Nr. eadg3702. DOI 10.1126/sciadv.adg3702.

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Abstract

The ratio of atmosphere-derived 10 Be to continent-derived 9 Be 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 9 Be transfer through the land-ocean interface. The riverine dissolved load alone is insufficient to close the marine 9 Be budget, largely due to substantial removal of riverine 9 Be 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 9 Be 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.

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