Multi-colony calibration of barium isotopes between shallow-water coral skeletons and in-situ seawater: Implications for paleo proxies

Hsieh, Yu-Te; Paver, Robert; Tanzil, Jani; Bridgestock, Luke; Lee, Jen Nie; Henderson, Gideon M.

doi:10.1016/j.epsl.2022.117369

Cited by 8 publications

(3 citation statements)

References 49 publications

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“…As Hsieh et al. (2022) and Yu et al. (2022) suggested, the coastal surface seawater [Ba] sw and δ 138/134 Ba sw have seasonal variations with high/low [Ba] sw /δ 138/134 Ba sw in wet season and low/high [Ba] sw /δ 138/134 Ba sw in dry season, which are related to freshwater inputs.…”

Section: Discussionmentioning

confidence: 98%

“…Figure 3 shows coral-inferred seawater elemental and isotopic data by converting coral Ba/Ca to [Ba] sw values using the equation Ba/Ca (μmol/mol) = 0.14 * [Ba] sw (nmol/kg) -0.8 (LaVigne et al, 2016), and δ 138/134 Ba coral to δ 138/134 Ba sw using an isotope fractionation offset (Δ 138/134 Ba coral-sw ) of −0.2‰ between coral and seawater (Hemsing et al, 2018). As Hsieh et al (2022) and Yu et al (2022) suggested, the coastal surface seawater [Ba] sw and δ 138/134 Ba sw have seasonal variations with high/low [Ba] sw /δ 138/134 Ba sw in wet season and low/high [Ba] sw /δ 138/134 Ba sw in dry season, which are related to freshwater inputs. Thus, the surface seawater samples collected from Nanwan in September (wet season) are characterized by slightly higher [Ba] sw (40 and 50 nmol/kg) and lower δ 138/134 Ba sw (0.45 ± 0.08‰ and 0.48 ± 0.07‰) than the reconstructed values by #NW coral ([Ba] sw : 26-60 nmol/kg; δ 138/134 Ba sw : 0.52-0.60‰).…”

Section: General View Of Measured Ba/ca and δ 138/134 Ba Recordsmentioning

confidence: 99%

“…Using coral Ba/Ca ratios alone, it is difficult to identify and disentangle the relative contributions of all potential Ba sources to coastal seawaters in the past. Previous studies have found that coral Ba isotope ratios (δ 138/134 Ba) faithfully record the Ba isotopic composition of ambient seawater (Geyman et al, 2019;Hemsing et al, 2018;Hsieh et al, 2022;Liu et al, 2019;Yu et al, 2022). δ 138/134 Ba ratios are lower in rivers (0.2-0.3‰) (Bridgestock et al, 2021;, barites (−0.2‰ to 0.3‰) (Tian et al, 2019), and waste waters (−0.1‰ to 0.1‰) (Cao et al, 2021) than in surface seawater (∼0.6‰) (Bridgestock et al, 2021;Cao et al, 2021;Hsieh & Henderson, 2017).…”

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confidence: 93%

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Coral Record of Increased Soil Erosion Since East and Southeast Asia Economic Boom

Zeng

Liu

et al. 2023

JGR Oceans

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Soil erosion in East and Southeast Asia is believed to have increased significantly since the regional economic boom of the 1970s–1980s. However, limited records of soil erosion make it difficult to understand and indeed verify such changes. Here we present two new monthly resolved Ba/Ca records from Porites coral skeletons from southern Taiwan and central Vietnam, supplemented with some sporadic monthly and annually resolved coral δ138/134Ba data. Our records span the 1980s to the 2000s and suggest that there were intervals of elevated seawater Ba concentrations (Basw) during the intervals 1987–1995 in southern Taiwan and 1992–2001 in central Vietnam. In combination with evidence for insignificant changes in regional seawater δ138/134Ba values, model simulations, and other published coral Ba/Ca records from Lanyu (offshore southeast Taiwan) and Hainan, we infer that the intervals of high Basw values are linked to soil erosion associated with land use changes and socioeconomic developments. The increased sediment loads are also likely responsible for the recent degradation of regional coral reefs. Our study provides new insights into regional soil erosion histories, which may prove useful for guiding soil conservation and sustainable land management.

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Section: Discussionmentioning

confidence: 98%