Spatial distribution and hydrogeochemical processes of high iodine groundwater in the Hetao Basin, China

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 953, P. 176116 - 176116

Published: Sept. 7, 2024

Language: Английский

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Characterizing the marine iodine cycle and its relationship to ocean deoxygenation in an Earth System model

Published: April 2, 2024

Abstract. Iodine abundance in marine carbonates (as an elemental ratio with calcium – I:Ca) is of broad interest as a proxy for local/regional ocean redox. This connection arises because the speciation iodine seawater—in terms balance between iodate (IO3-) and iodide (I-)—is sensitive to prevalence oxic vs. anoxic conditions. However, although I:Ca ratios are being increasingly commonly measured ancient carbonate samples, fully quantitative interpretation this hindered by scarcity mechanistic framework cycle its sensitivity extent intensity deoxygenation. Here we present evaluate representation cycling embedded Earth system model (‘cGENIE’) against both modern paleo observations. In this, account IO3- uptake reduction primary producers, occurrence ambient water column, plus re-oxidation I- IO3-. We develop test variety different relationships IO­3- updated compilation observed dissolved concentrations present-day ocean. optimizing parameters controlling previously proposed mechanisms behind cycling, find that can obtain matches gradients zonal surface distribution, depth profiles, oxygen deficient zones (ODZs). also identify alternative, equally well performing which assume more explicit link transformation environment. ambiguity highlights need process-based studies on cycling. Finally, our ultimate motivation further ability reconstruct oxygenation geological past, conducted ‘plausibility tests’ various schemes available measurements made Cretaceous time substantially depleted availability compared hence strong model. Overall, simultaneous match achieve modelled observations, forward-proxy supports application modelling simulating help interpret constrain redox evolution past oceans.

Language: Английский

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Comment on egusphere-2024-677

Published: April 23, 2024

Abstract. Iodine abundance in marine carbonates (as an elemental ratio with calcium – I:Ca) is of broad interest as a proxy for local/regional ocean redox. This connection arises because the speciation iodine seawater—in terms balance between iodate (IO₃^-) and iodide (I^-)—is sensitive to prevalence oxic vs. anoxic conditions. However, although I:Ca ratios are being increasingly commonly measured ancient carbonate samples, fully quantitative interpretation this hindered by scarcity mechanistic framework cycle its sensitivity extent intensity deoxygenation. Here we present evaluate representation cycling embedded Earth system model (‘cGENIE’) against both modern paleo observations. In this, account IO₃^- uptake reduction primary producers, occurrence ambient water column, plus re-oxidation I^- IO₃^-. We develop test variety different relationships IO­₃^- updated compilation observed dissolved concentrations present-day ocean. optimizing parameters controlling previously proposed mechanisms behind cycling, find that can obtain matches gradients zonal surface distribution, depth profiles, oxygen deficient zones (ODZs). also identify alternative, equally well performing which assume more explicit link transformation environment. ambiguity highlights need process-based studies on cycling. Finally, our ultimate motivation further ability reconstruct oxygenation geological past, conducted ‘plausibility tests’ various schemes available measurements made Cretaceous time substantially depleted availability compared hence strong model. Overall, simultaneous match achieve modelled observations, forward-proxy supports application modelling simulating help interpret constrain redox evolution past oceans.

Language: Английский

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Comment on egusphere-2024-677

Published: April 25, 2024

Abstract. Iodine abundance in marine carbonates (as an elemental ratio with calcium – I:Ca) is of broad interest as a proxy for local/regional ocean redox. This connection arises because the speciation iodine seawater—in terms balance between iodate (IO₃^-) and iodide (I^-)—is sensitive to prevalence oxic vs. anoxic conditions. However, although I:Ca ratios are being increasingly commonly measured ancient carbonate samples, fully quantitative interpretation this hindered by scarcity mechanistic framework cycle its sensitivity extent intensity deoxygenation. Here we present evaluate representation cycling embedded Earth system model (‘cGENIE’) against both modern paleo observations. In this, account IO₃^- uptake reduction primary producers, occurrence ambient water column, plus re-oxidation I^- IO₃^-. We develop test variety different relationships IO­₃^- updated compilation observed dissolved concentrations present-day ocean. optimizing parameters controlling previously proposed mechanisms behind cycling, find that can obtain matches gradients zonal surface distribution, depth profiles, oxygen deficient zones (ODZs). also identify alternative, equally well performing which assume more explicit link transformation environment. ambiguity highlights need process-based studies on cycling. Finally, our ultimate motivation further ability reconstruct oxygenation geological past, conducted ‘plausibility tests’ various schemes available measurements made Cretaceous time substantially depleted availability compared hence strong model. Overall, simultaneous match achieve modelled observations, forward-proxy supports application modelling simulating help interpret constrain redox evolution past oceans.

Language: Английский

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Reply on RC2

Published: June 5, 2024

Abstract. Iodine abundance in marine carbonates (as an elemental ratio with calcium – I:Ca) is of broad interest as a proxy for local/regional ocean redox. This connection arises because the speciation iodine seawater—in terms balance between iodate (IO₃^-) and iodide (I^-)—is sensitive to prevalence oxic vs. anoxic conditions. However, although I:Ca ratios are being increasingly commonly measured ancient carbonate samples, fully quantitative interpretation this hindered by scarcity mechanistic framework cycle its sensitivity extent intensity deoxygenation. Here we present evaluate representation cycling embedded Earth system model (‘cGENIE’) against both modern paleo observations. In this, account IO₃^- uptake reduction primary producers, occurrence ambient water column, plus re-oxidation I^- IO₃^-. We develop test variety different relationships IO­₃^- updated compilation observed dissolved concentrations present-day ocean. optimizing parameters controlling previously proposed mechanisms behind cycling, find that can obtain matches gradients zonal surface distribution, depth profiles, oxygen deficient zones (ODZs). also identify alternative, equally well performing which assume more explicit link transformation environment. ambiguity highlights need process-based studies on cycling. Finally, our ultimate motivation further ability reconstruct oxygenation geological past, conducted ‘plausibility tests’ various schemes available measurements made Cretaceous time substantially depleted availability compared hence strong model. Overall, simultaneous match achieve modelled observations, forward-proxy supports application modelling simulating help interpret constrain redox evolution past oceans.

Language: Английский

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Reply on RC1

Published: June 5, 2024

Abstract. Iodine abundance in marine carbonates (as an elemental ratio with calcium – I:Ca) is of broad interest as a proxy for local/regional ocean redox. This connection arises because the speciation iodine seawater—in terms balance between iodate (IO₃^-) and iodide (I^-)—is sensitive to prevalence oxic vs. anoxic conditions. However, although I:Ca ratios are being increasingly commonly measured ancient carbonate samples, fully quantitative interpretation this hindered by scarcity mechanistic framework cycle its sensitivity extent intensity deoxygenation. Here we present evaluate representation cycling embedded Earth system model (‘cGENIE’) against both modern paleo observations. In this, account IO₃^- uptake reduction primary producers, occurrence ambient water column, plus re-oxidation I^- IO₃^-. We develop test variety different relationships IO­₃^- updated compilation observed dissolved concentrations present-day ocean. optimizing parameters controlling previously proposed mechanisms behind cycling, find that can obtain matches gradients zonal surface distribution, depth profiles, oxygen deficient zones (ODZs). also identify alternative, equally well performing which assume more explicit link transformation environment. ambiguity highlights need process-based studies on cycling. Finally, our ultimate motivation further ability reconstruct oxygenation geological past, conducted ‘plausibility tests’ various schemes available measurements made Cretaceous time substantially depleted availability compared hence strong model. Overall, simultaneous match achieve modelled observations, forward-proxy supports application modelling simulating help interpret constrain redox evolution past oceans.

Language: Английский

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