Behaviour of barium in the tropical estuaries: Implications to its marine budgets and paleo-oceanographic applications

Rahaman, Waliur; Singh, Sunil Kumar

doi:10.1016/j.marchem.2023.104278

Cited by 1 publication

(3 citation statements)

References 49 publications

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“…Rivers and SGD inputs, on average, represent 21% and 17% of the total surface Ba input fluxes, respectively. Despite this, the global significance of saline SGD and its role in contributing Ba to the ocean remains poorly constrained, and may be underestimated (Rahaman & Singh, 2023; Rahman et al., 2022). Export is larger than all incoming Ba sources in the North Pacific, leading to a net deficit in the surface, consistent with large negative Ba anomalies in the top 2,000 m along GP15.…”

Section: Discussionmentioning

confidence: 99%

“…Rivers are often considered to be the dominant source of dissolved Ba in the ocean (Edmond et al., 1978; Wolgemuth & Broecker, 1970). Estimated Ba fluxes from rivers, including desorption from suspended particulate matter, range from 10 to 20 Gmol y −1 for the global ocean (Bridgestock et al., 2021; Mayfield et al., 2021; Paytan & Kastner, 1996; Rahaman & Singh, 2023; Rahman et al., 2022). About 20% of the global river discharges enter the Pacific (Meybeck & Ragu, 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Hydrothermal circulating fluids are enriched in radionuclides, such as radium, during the circulation of seawater through the crust via water-rock reactions (Cochran, 1982;Kadko & Moore, 1988). The hydrothermal Bridgestock et al, 2021;Edmond et al, 1978;Mayfield et al, 2021;Rahaman & Singh, 2023;Rahman et al, 2022) Submarine Groundwater Discharge (fresh and saltwater) <0.1 (Elderfield & Schultz, 1996;Kipp, Sanial, et al, 2018;Nielsen et al, 2006) Benthic flux (Dissolution and 226…”

Section: Hydrothermalmentioning

confidence: 99%

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Controls on Dissolved Barium and Radium‐226 Distributions in the Pacific Ocean Along GEOTRACES GP15

Le Roy,

Charette,

Henderson

et al. 2024

Global Biogeochemical Cycles

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Radium‐226(226Ra) and barium (Ba) exhibit similar chemical behaviors and distributions in the marine environment, serving as valuable tracers of water masses, ocean mixing, and productivity. Despite their similar distributions, these elements originate from distinct sources and undergo disparate biogeochemical cycles, which might complicate the use of these tracers. In this study, we investigate these processes by analyzing a full‐depth ocean section of 226Ra activities (T1/2 = 1,600 years) and barium concentrations obtained from samples collected along the US GEOTRACES GP15 Pacific Meridional Transect during September–November 2018, spanning from Alaska to Tahiti. We find that surface waters possess low levels of 226Ra and Ba due to export of sinking particulates, surpassing inputs from the continental margins. In contrast, deep waters have higher 226Ra activities and Ba concentrations due to inputs from particle regeneration and sedimentary sources, with 226Ra inputs primarily resulting from the decay of 230Th in sediments. Further, dissolved 226Ra and Ba exhibit a strong correlation along the GP15 section. To elucidate the drivers of the correlation, we used a water mass analysis, enabling us to quantify the influence of water mass mixing relative to non‐conservative processes. While a significant fraction of each element's distribution can be explained by conservative mixing, a considerable fraction cannot. The balance is driven using non‐conservative processes, such as sedimentary, rivers, or hydrothermal inputs, uptake and export by particles, and particle remineralization. Our study demonstrates the utility of 226Ra and Ba as valuable biogeochemical tracers for understanding ocean processes, while shedding light on conservative and myriad non‐conservative processes that shape their respective distributions.

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Section: Discussionmentioning

confidence: 99%