Dominance of benthic flux of REEs on continental shelves: implications for oceanic budgets

Deng, K.; Yang, S.; Du, Jianghui; Lian, E.; Vance, Derek

doi:10.7185/geochemlet.2223

Cited by 12 publications

(11 citation statements)

References 24 publications

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“…This suggests that perhaps too much emphasis has been put on a widespread abyssal benthic flux to resolve the Nd paradox, and it may be that shallower and marginal regions pose a larger in magnitude and more distinct Nd source to seawater as opposed to an open-ocean benthic source. Recent pore water measurements by Deng et al (2022) on the East China continental shelf revealed larger benthic fluxes across the dynamic hydraulic environment of the continental shelf compared to deep pore water, which acted as a sink, likely due to authigenic precipitation. As such, spatial variations in the benthic flux are likely affected by multiple complex depth-related processes, although deep-ocean regions may still dominate the total area-integrated benthic flux.…”

Section: Resultsmentioning

confidence: 99%

“…The decoupled nature of marine [Nd] and ε Nd , which is yet to be fully understood, and new emerging observations (e.g. Stichel et al, 2020;Lagarde et al, 2020;Paffrath et al, 2021;Deng et al, 2022) emphasise the critical need to progress our understanding of modern marine Nd cycling in the light of continued use of ε Nd as a valuable tracer of ocean circulation. In this context, Nd-isotopeenabled ocean models remain an effective way to understand seawater measurements and to progress with testing and constraining processes governing marine Nd cycling, which can then feedback key information to the wider GEOTRACES and ocean tracer modelling community.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simulating marine neodymium isotope distributions using Nd v1.0 coupled to the ocean component of the FAMOUS–MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions

et al. 2023

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Abstract. The neodymium (Nd) isotopic composition of seawater is a widely used ocean circulation tracer. However, uncertainty in quantifying the global ocean Nd budget, particularly constraining elusive non-conservative processes, remains a major challenge. A substantial increase in modern seawater Nd measurements from the GEOTRACES programme, coupled with recent hypotheses that a seafloor-wide benthic Nd flux to the ocean may govern global Nd isotope distributions (εNd), presents an opportunity to develop a new scheme specifically designed to test these paradigms. Here, we present the implementation of Nd isotopes (143Nd and 144Nd) into the ocean component of the FAMOUS coupled atmosphere–ocean general circulation model (Nd v1.0), a tool which can be widely used for simulating complex feedbacks between different Earth system processes on decadal to multi-millennial timescales. Using an equilibrium pre-industrial simulation tuned to represent the large-scale Atlantic Ocean circulation, we perform a series of sensitivity tests evaluating the new Nd isotope scheme. We investigate how Nd source and sink and cycling parameters govern global marine εNd distributions and provide an updated compilation of 6048 Nd concentrations and 3278 εNd measurements to assess model performance. Our findings support the notions that reversible scavenging is a key process for enhancing the Atlantic–Pacific basinal εNd gradient and is capable of driving the observed increase in Nd concentration along the global circulation pathway. A benthic flux represents a major source of Nd to the deep ocean. However, model–data disparities in the North Pacific highlight that under a uniform benthic flux, the source of εNd from seafloor sediments is too non-radiogenic in our model to be able to accurately represent seawater measurements. Additionally, model–data mismatch in the northern North Atlantic alludes to the possibility of preferential contributions from “reactive” non-radiogenic detrital sediments. The new Nd isotope scheme forms an excellent tool for exploring global marine Nd cycling and the interplay between climatic and oceanographic conditions under both modern and palaeoceanographic contexts.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulating marine neodymium isotope distributions using Nd v1.0 coupled to the ocean component of the FAMOUS–MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions

et al. 2023

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“…Overlying bottom water was first drained and filtered. Pore-water was separated using methods previously described in detail ( 31 , 50 ) at ~cm resolution, either by centrifuging sliced core sediment under anaerobic conditions followed by filtration (Baltic Sea samples: 0.2-μm filters and Mexico-California margin samples: 0.45-μm filters) or by in situ extraction via precleaned Rhizon samplers (East China Sea samples: 0.15-μm filters). Water samples were acidified for storage (pH ≤ 2).…”

Section: Methodsmentioning

confidence: 99%

“…We developed a procedure that can separate three components, which are, salt matrix, Be, and other trace metals such as REE on the same sample, optimizing the usage of precious pore-water samples. To do so, we coupled a well-established REE preconcentration protocol ( 50 , 51 ) with an additional procedure for the preconcentration of Be from the remaining seawater matrix ( 14 , 52 ).…”

Section: Methodsmentioning

confidence: 99%

Dominance of benthic fluxes in the oceanic beryllium budget and implications for paleo-denudation records

et al. 2023

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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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“…frontiersin.org proxies to reveal the source, genesis, and sedimentary environment (Jiang et al, 2019;Gallello et al, 2021;Romero et al, 2021;Zhang X et al, 2021;Deng et al, 2022a).…”

Section: Frontiers In Environmental Sciencementioning

confidence: 99%

Rare earth elements in aeolian loess sediments from Menyuan Basin, northeastern Tibetan plateau: Implications for provenance

Chongyi¹,

Peng²,

Zhang³

et al. 2023

Front. Environ. Sci.

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Aeolian loess is a widespread deposit in mid-latitude arid and semiarid regions that has been extensively investigated in arid Central Asia and the Chinese Loess Plateau. The northeastern Tibetan Plateau is crucial to the release, transport, and accumulation of aeolian sediments because of its vast environmental differences, but relatively little research has been conducted on the loess here. To further deepen our understanding of the loess source in this region, we selected the Menyuan Basin as the study area for this loess tracing research. Through our investigation of the indicators and distribution characteristics of rare earth elements in the Yahecun (YHC) loess-paleosol profile of the Menyuan Basin, the following conclusions were drawn: 1) the indices and distribution curves of rare earth elements in the diverse strata of the YHC profile were not significantly distinct and were comparable to those of loess from other locations in northwestern China, revealing a general association with loess in arid northwestern China; 2) the influence of chemical weathering and particle diameter on rare earth elements in the loess of the study area was minimal, and Menyuan loess rare earth elements contained considerable information regarding their source; and 3) a comparison of the (La/Yb)N, δEu, (La/Sm)N, and (Gd/Yb)N parameters of potential source areas indicates that arid Central Asia, dominated by the Qaidam Desert, is the primary source area of the Menyuan loess, and dust particles released from these deserts are transported to the Menyuan Basin by the Westerlies and deposited to form loess. Additionally, the Badain Jaran Desert is an essential source of material for the Menyuan loess by winter winds, and some Tengger Desert materials are also transported to the Menyuan Basin by winter winds, but the material transported from the Tengger Desert has a negligible contribution.

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Dominance of benthic flux of REEs on continental shelves: implications for oceanic budgets

Cited by 12 publications

References 24 publications

Simulating marine neodymium isotope distributions using Nd v1.0 coupled to the ocean component of the FAMOUS–MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions

Simulating marine neodymium isotope distributions using Nd v1.0 coupled to the ocean component of the FAMOUS–MOSES1 climate model: sensitivities to reversible scavenging efficiency and benthic source distributions

Dominance of benthic fluxes in the oceanic beryllium budget and implications for paleo-denudation records

Rare earth elements in aeolian loess sediments from Menyuan Basin, northeastern Tibetan plateau: Implications for provenance

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