Tracing impact of El Niño Southern Oscillation on coastal hydrology using coral 87Sr/86Sr record from Lakshadweep, South-Eastern Arabian Sea

Rahaman, Waliur; Tarique, Mohd; Fousiya, A. A.; Prabhat, Priyesh; Achyuthan, Hema

doi:10.1016/j.scitotenv.2022.157035

Cited by 7 publications

(2 citation statements)

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“…The application of Sr/Ca as a temperature proxy may be compromised by geology and local climatology (Wei et al., 2000). The seawater chemistry in Majuro Atoll may be influenced by submarine aquifers that drain rainwater through the carbonate basement of the atoll which can compromise the Sr/Ca‐temperature relationship (Rahaman et al., 2022). But in this study, we do not have enough evidence to support this argument without further investigation.…”

Section: Discussionmentioning

confidence: 99%

Impact of Intra‐Skeletal Calcite on the Preservation of Coral Geochemistry and Implications for Paleoclimate Reconstruction

Weerabaddana,

Thompson,

Reed

et al. 2024

Paleoceanog and Paleoclimatol

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The geochemistry of tropical coral skeletons is widely used in paleoclimate reconstructions. However, sub‐aerially exposed corals may be affected by diagenesis, altering the aragonite skeleton through partial dissolution, or infilling of secondary minerals like calcite. We analyzed the impact of intra‐skeletal calcite on the geochemistry (δ18O, Sr/Ca, Mg/Ca, Li/Mg, Li/Ca, U/Ca, B/Ca, Ba/Ca, and Mn/Ca) of a sub‐aerially exposed Porites sp. coral. Each micro‐milled coral sample was split into two aliquots for geochemistry and X‐ray diffraction (XRD) analysis to quantify the direct impact of calcite on geochemistry. We modified the sample loading technique for XRD to detect low calcite levels (1%–2%; total uncertainty = 0.33%, 2σ) in small samples (∼7.5 mg). Calcite content ranged from 0% to 12.5%, with higher percentages coinciding with larger geochemical offsets. Sr/Ca, Li/Mg, Li/Ca, and δ18O‐derived sea‐surface temperature (SST) anomalies per 1% calcite were +0.43°C, +0.24°C, +0.11°C, and +0.008°C, respectively. A 3.6% calcite produces a Sr/Ca‐SST signal commensurate with local SST seasonality (∼1.5°C), which we propose as the cut‐off level for screening calcite diagenesis in paleo‐temperature reconstructions. Inclusion of intra‐skeletal calcite decreases B/Ca, Ba/Ca, and U/Ca values, and increases Mg/Ca values, and can therefore impact reconstructions of paleoclimate and the carbonate chemistry of the semi‐isolated calcifying fluid in corals. This study emphasizes the importance of quantifying fine‐scale calcite diagenesis to identify coral preservation levels and assure robust paleoclimate reconstructions.

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Section: Discussionmentioning

confidence: 99%

Impact of Intra‐Skeletal Calcite on the Preservation of Coral Geochemistry and Implications for Paleoclimate Reconstruction

Weerabaddana,

Thompson,

Reed

et al. 2024

Paleoceanog and Paleoclimatol

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“…2020;Naracic, et al 2022), paleosoils (Bradák, 2022;Hou et al, 2022. ), tree rings (Housett, 2018;Büntgen, 2022), corals (Delong, 2013;Rahaman et al, 2022), speleothems (Ronay, 2019;Demény, 2021) are actively studied.…”

Section: Table Of Contentsmentioning

confidence: 99%

The environmental change in the Lake Bolătău

Karlik

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IV.3 Results _____________________________________________________________________________ IV.4 Discussion ___________________________________________________________________________ IV.4.1 Weathering processes in the catchment of lake Bolătău-Feredeu___________________________ IV.4.2 Environment changes in the lake-catchment system _____________________________________ IV.5. Conclusions _________________________________________________________________________ Acknowledgements _______________________________________________________________________ CHAPTER V.: CONCLUSIONS ________________________________________________ SUMMARY _____________________________________________________________ I. Introduction and Objectives ___________________________________________________________ II. Methods ______________________________________________________________________________ II.1 Summary of methods used for bedrock and soil materials ___________________________________ II.2. Summary of methods used for lake sediment samples _____________________________________ III. New scientific results ___________________________________________________________________ ÖSSZEFOGLALÁS_________________________________________________________ I. Bevezetés és célok ___________________________________________________________________ II. Alkalmazott módszerek _________________________________________________________________ II.1 Alapkőzet és talajtani vizsgálatok összefoglalása __________________________________________ II.2. Tavi üledéken végzett vizsgálatok ______________________________________________________ III. Új tudományos eredmények _____________________________________________________________

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Mechanisms and proxies of solar forcing on climate and a peek into Indian paleoclimatic records

Panchang,

Ambokar,

Panchamwar

et al. 2024

The Role of Tropics in Climate Change

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Tracing impact of El Niño Southern Oscillation on coastal hydrology using coral 87Sr/86Sr record from Lakshadweep, South-Eastern Arabian Sea

Cited by 7 publications

References 71 publications

Impact of Intra‐Skeletal Calcite on the Preservation of Coral Geochemistry and Implications for Paleoclimate Reconstruction

Impact of Intra‐Skeletal Calcite on the Preservation of Coral Geochemistry and Implications for Paleoclimate Reconstruction

The environmental change in the Lake Bolătău

Mechanisms and proxies of solar forcing on climate and a peek into Indian paleoclimatic records

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