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Environmental Earth Sciences

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01.01.2024 | Original Article

Exploring riverine solute behavior, dynamics, and export into the Arabian Sea from a semi-arid catchment, Western India

verfasst von: Shailja Singh, Anirban Das, A. K. Sudheer, Mahesh Gaddam

Erschienen in: Environmental Earth Sciences | Ausgabe 2/2024

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Abstract

The geochemistry of rivers draining into the Arabian Sea has received lesser attention than their eastern counterparts draining into the Bay of Bengal. The major ion concentrations in the third-major river (Mahi) draining into the Arabian Sea have been reported. Hydrochemistry of seasonally collected samples (n = 67) during two consecutive years reveals that the average solute export and the cationic charges are ~ 1.2 and ~ 4 times their corresponding global average values. Generally, lower solute levels (except Ca) in the rainy season reflect the dilution effect. In contrast, the higher intensity of carbonate weathering out-weighing the dilution effect, aided by CaCO₃ precipitation in summer, dominates the Ca dynamics. Chemical weathering in the catchment is mediated predominantly by carbonic acid, as evident from the alkalinity/(Ca + Mg) and SO₄/(Ca + Mg) molar ratios. Using a forward model, the estimated average contributions from various sources to the cationic composition are atmospheric (5 ± 1%), evaporites and soil salts (27 ± 9%), silicates (39 ± 12%), and carbonates (29 ± 13%). Runoff exerts the dominant control on the weathering rates, with the best estimated average silicate (11 t km⁻² yr⁻¹), carbonate (22 t km⁻² yr⁻¹), and evaporite and soil-salt (8 t km⁻² yr⁻¹) weathering rates, which sums up to a dissolved chemical flux of ~ 41 t km⁻² yr⁻¹. The lower-bound estimate of CO₂ consumption by silicate weathering of the Mahi basin is ~ 2.8 × 10⁵ mol km⁻² yr⁻¹, translating into CO₂ consumption of ~ 9.7 × 10⁹ mol yr⁻¹. This is ~ 0.08% of the global average value (by silicate weathering) and is disproportionately higher than its fractional continental drainage area (~ 0.03%). Integrating the data of Mahi with those available for the other two major rivers (Narmada & Tapti), this study underscores the prominent role of these rivers in supplying solutes to the Arabian Sea and controlling the biogeochemistry of the Arabian Sea.

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Titel: Exploring riverine solute behavior, dynamics, and export into the Arabian Sea from a semi-arid catchment, Western India
verfasst von: Shailja Singh
Anirban Das
A. K. Sudheer
Mahesh Gaddam
Publikationsdatum: 01.01.2024
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 2/2024
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-023-11348-6

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