Human-induced metals accumulation in sediments of an industrialized bay of northern Chile. An enrichment and ecological risk assessment based on preindustrial values

Valdés, Jorge; Ortlieb, Luc; Sifeddine, A.; Castillo, Alexis

doi:10.1016/j.marpolbul.2023.114723

“…Some pollutant metals for aquatic life and human health are also redox sensitive, such as Mo, Zn, B, Mn, Ba, Co, Ni, Sr, Cr, Cd, Zr, V, Cu, Ce. In some regions, the concentrations of these elements have recently increased, exceeding the preindustrial values, and the values do not align with increases in lithogenic background inputs (Muñoz et al, 2022;Valdés et al, 2023). As river sediments may concentrate and deliver anthropogenically-sourced metals during transport to the ocean (Pizarro et al, 2010;Yevenes et al, 2018), using standard lithogenic background corrections may overestimate enrichment factors as the authigenic fraction will be augmented with the anthropogenic input.…”

Section: Towards More Quantitative Oxygen Proxies On a Local Scalementioning

confidence: 99%

“…In regions with high anthropogenic input, it is thus recommended to use the local lithogenic background in the region of study (e.g., crust, river, dust, wetland sediment) (Muñoz et al, 2022Valdés & Tapia, 2019;Valdés et al, 2023).…”

Section: Towards More Quantitative Oxygen Proxies On a Local Scalementioning

confidence: 99%

Reviews and syntheses: Review of proxies for low-oxygen paleoceanographic reconstructions

Hoogakker,

Davis,

Wang

et al. 2024

Preprint

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Abstract. A growing body of observations reveals rapid changes in both the total inventory and distribution of marine oxygen over the later half of the 21st century, leading to increased interest in extending oxygenation records into the past. Use of paleo-oxygen proxies have the potential to extend the spatial and temporal range of current records, bound pre-anthropogenic baselines, provide datasets necessary to test climate models under different boundary conditions, and ultimately understand how ocean oxygenation responds beyond decadal scale changes. This review seeks to summarize the current state-of-knowledge about proxies for reconstructing Cenozoic marine oxygen: sedimentary features, sedimentary redox-sensitive trace elements and isotopes, biomarkers, nitrogen isotopes, foraminiferal trace elements, foraminifera assemblages, foraminifera morphometrics, and benthic foraminifera carbon isotope gradients. Taking stock of each proxy reveals some common limitations in that the majority of proxies function best at low-oxygen concentrations and many reflect multiple environmental drivers. We also highlight recent breakthroughs in geochemistry and proxy approaches for constraining pelagic (in addition to benthic) oxygenation that are rapidly advancing the field. In light of both the emergence of new proxies and the persistent multiple driver problem, the need for multi-proxy approaches and FAIR data storage and sharing is emphasized. Continued refinement of proxy approaches and both proxy-proxy and proxy-model comparisons are likely to support the growing needs of both oceanographer and paleoceanographers interested in paleo-oxygenation records.

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“…Some pollutant metals for aquatic life and human health are also redox sensitive, such as Mo, Zn, B, Mn, Ba, Co, Ni, Sr, Cr, Cd, Zr, V, Cu, Ce. In some regions, the concentrations of these elements have recently increased, exceeding the preindustrial values, and the values do not align with increases in lithogenic background inputs (Muñoz et al, 2022;Valdés et al, 2023). As river sediments may concentrate and deliver anthropogenically-sourced metals during transport to the ocean (Pizarro et al, 2010;Yevenes et al, 2018), using standard lithogenic background corrections may overestimate enrichment factors as the authigenic fraction will be augmented with the anthropogenic input.…”

Section: Towards More Quantitative Oxygen Proxies On a Local Scalementioning

confidence: 99%

“…In regions with high anthropogenic input, it is thus recommended to use the local lithogenic background in the region of study (e.g., crust, river, dust, wetland sediment) (Muñoz et al, 2022Valdés & Tapia, 2019;Valdés et al, 2023).…”

Section: Towards More Quantitative Oxygen Proxies On a Local Scalementioning

confidence: 99%

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Hoogakker

2024

0

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“…Some pollutant metals for aquatic life and human health are also redox sensitive, such as Mo, Zn, B, Mn, Ba, Co, Ni, Sr, Cr, Cd, Zr, V, Cu, Ce. In some regions, the concentrations of these elements have recently increased, exceeding the preindustrial values, and the values do not align with increases in lithogenic background inputs (Muñoz et al, 2022;Valdés et al, 2023). As river sediments may concentrate and deliver anthropogenically-sourced metals during transport to the ocean (Pizarro et al, 2010;Yevenes et al, 2018), using standard lithogenic background corrections may overestimate enrichment factors as the authigenic fraction will be augmented with the anthropogenic input.…”

Section: Towards More Quantitative Oxygen Proxies On a Local Scalementioning

confidence: 99%

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Hoogakker

2024

0

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Human-induced metals accumulation in sediments of an industrialized bay of northern Chile. An enrichment and ecological risk assessment based on preindustrial values

Cited by 4 publications

References 80 publications

Reviews and syntheses: Review of proxies for low-oxygen paleoceanographic reconstructions

Reviews and syntheses: Review of proxies for low-oxygen paleoceanographic reconstructions

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