Net effect of chemical erosion in a tropical basin on carbon cycle: Constraints from elemental and sulfur isotopic composition of the Mahanadi river water

Rout, Rakesh Kumar; Tripathy, Gyana Ranjan

doi:10.1016/j.chemgeo.2023.121859

Chemical Geology

2024

DOI: 10.1016/j.chemgeo.2023.121859

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Net effect of chemical erosion in a tropical basin on carbon cycle: Constraints from elemental and sulfur isotopic composition of the Mahanadi river water

Rakesh Kumar Rout,

Gyana Ranjan Tripathy

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2024

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Cited by 3 publications

References 90 publications

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Dominant Production of Dissolved Inorganic Carbon by Organic Matter Degradation in a Coastal Lagoon: Evidence from Carbon Isotopes

Danish,

Tripathy

2024

ACS Earth Space Chem.

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Coastal oceanic settings are biogeochemically active zones and play a dominant role in the global carbon cycle. In this contribution, we have investigated the spatial distribution of dissolved inorganic carbon (DIC) and δ 13 C DIC along the salinity gradient of a large tropical coastal lagoon (Chilika, India) and major source waters (river, groundwater) to the lagoon for three different (pre-monsoon, monsoon, and post-monsoon) seasons. These data were used to constrain internal cycling and DIC fluxes to the Bay of Bengal. The average [DIC] and δ 13 C DIC values of the Chilika, although they exhibit significant variation within a season, are found comparable for the premonsoon (1.8 ± 0.6 mM; −5 ± 3 ‰), monsoon (1.7 ± 0.4 mM; −4 ± 2 ‰), and post-monsoon (1.9 ± 0.3 mM; −4 ± 3‰) samples. Co-variation between DIC (and δ 13 C DIC ) and salinity during all three seasons deviates from the theoretical mixing line (TML) between river and seawater, indicating nonconservative behavior of DIC in the lagoon. The magnitude of the DIC and δ 13 C DIC deviations from their corresponding TML points to dominancy of organic matter degradation in causing this nonconservative trend. Additionally, the pre-monsoon samples also show a minor effect of calcite precipitation on the [DIC]. The LOICZ model estimates that the DIC flux from this lagoon to the ocean is higher than that reported for several peninsular Indian rivers, despite their high (378 km 3 /yr) freshwater influxes to the Bay of Bengal. This disproportionally higher DIC flux is linked to remineralization of organic matter, underscoring its importance in regulating the inorganic carbon cycle of this highly productive coastal system.

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Dominant Production of Dissolved Inorganic Carbon by Organic Matter Degradation in a Coastal Lagoon: Evidence from Carbon Isotopes

Danish,

Tripathy

2024

ACS Earth Space Chem.

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The Global Biogeochemical Cycle of Rhenium

Ghazi,

Grant,

Chappaz

et al. 2024

Global Biogeochemical Cycles

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This paper is the first comprehensive synthesis of what is currently known about the different natural and anthropogenic fluxes of rhenium (Re) on Earth's surface. We highlight the significant role of anthropogenic mobilization of Re, which is an important consideration in utilizing Re in the context of a biogeochemical tracer or proxy. The largest natural flux of Re derives from chemical weathering and riverine transport to the ocean (dissolved = 62 × 106 g yr−1 and particulate = 5 × 106 g yr−1). This review reports a new global average [Re] of 16 ± 2 pmol L−1, or 10 ± 1 pmol L−1 for the inferred pre‐anthropogenic concentration without human impact, for rivers draining to the ocean. Human activity via mining (including secondary mobilization), coal combustion, and petroleum combustion mobilize approximately 560 × 106 g yr−1 Re, which is more than any natural flux of Re. There are several poorly constrained fluxes of Re that merit further research, including: submarine groundwater discharge, precipitation (terrestrial and oceanic), magma degassing, and hydrothermal activity. The mechanisms and the main host phases responsible for releasing (sources) or sequestrating (sinks) these fluxes remain poorly understood. This study also highlights the use of dissolved [Re] concentrations as a tracer of oxidation of petrogenic organic carbon, and stable Re isotopes as proxies for changes in global redox conditions.

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Assessment of irrigation suitability of water in Hirakud reservoir and Bargarh main canal, Odisha, India: A multivariate analysis

Ahmed,

Sahoo,

Baitharu

2024

Water Supply

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The present study assesses the chemical characteristics and irrigation suitability of water in the Hirakud reservoir and main canal. Water samples were collected from 10 different sites during the premonsoon, monsoon, and postmonsoon seasons. The pH, EC, TDS, major ions, and trace metals were estimated using standard methods. The pH of water samples was slightly alkaline in a few sites. The concentration of all the major ions was below the permissible limit except for K+. The concentration of cations and anions in water was in the order of Ca2+ > Na+ >Mg2+ > K+ and HCO3− > Cl− > SO42− > NO3− respectively. Piper's trilinear diagram revealed that water samples were of Mg-HCO3− and mixed type. A strong correlation of Cl– with other ions suggested precipitation dominance in the hydrogeochemistry of water. The concentration of all trace metals in water samples was above the permissible limit across the season. Although reservoir water was of excellent category as per EC and SAR, RSC remained above the limit across the season. PCA suggested that anthropogenic and geogenic processes regulate water quality in the reservoir. The present work provides a baseline for water quality management policy for the Hirakud reservoir as well as the command area.

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Net effect of chemical erosion in a tropical basin on carbon cycle: Constraints from elemental and sulfur isotopic composition of the Mahanadi river water

Cited by 3 publications

References 90 publications

Dominant Production of Dissolved Inorganic Carbon by Organic Matter Degradation in a Coastal Lagoon: Evidence from Carbon Isotopes

Dominant Production of Dissolved Inorganic Carbon by Organic Matter Degradation in a Coastal Lagoon: Evidence from Carbon Isotopes

The Global Biogeochemical Cycle of Rhenium

Assessment of irrigation suitability of water in Hirakud reservoir and Bargarh main canal, Odisha, India: A multivariate analysis

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