Temporal dynamics of groundwater-dissolved inorganic carbon beneath a drought-affected braided stream: Platte River case study

Boerner, Audrey R.; Gates, John B.

doi:10.1002/2015jg002950

Cited by 5 publications

(2 citation statements)

References 63 publications

(89 reference statements)

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“…Sea water is recognized to be one major sink for CO 2 (Sabine et al, 2004), and in rivers, HCO 3 - concentrations, most probably derived from increased CO 2 , have shown higher concentrations (Meybeck, 1993). However, it is much less clear whether groundwater is a sink or source for global CO 2 levels (Boerner & Gates, 2015; Nydahl et al, 2020). More than likely, the net import of CO 2 into groundwater has risen, via the concentrations that have increased in soil (Bakalowicz, 1994).…”

Section: Introductionmentioning

confidence: 99%

Direct and indirect effects of the increase in atmospheric CO₂and temperature on groundwater organisms

Schmidt,

Svátková,

Kodeš

et al. 2023

Preprint

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Atmospherically rising temperature and CO2 impact all freshwater systems, including groundwater. Increasing CO2 leads to more intense weathering of silicate rocks. Here, we tested whether the increased levels, the weathering, or rather the increasing temperature, impacted on fauna and prokaryotes in the groundwater ecosystem. We conducted the analyses separately for deep, i.e. secluded, and shallow, quaternary aquifers which exchange with the surface more intensely. Organism abundances and relative composition did not correlate with temperature or CO2 levels. While many organisms rely on silica, in contrast, we found negative correlations between silica and fauna. The increases in silica over time, i.e. temporal trends, also partly correlated negatively with organisms. We hypothesize that the unexpected negative correlations are not direct effects, but indirectly indicate that groundwater communities do not adapt rapidly enough to changes. This jeopardizes future drinking water production which relies on the self-cleaning ecosystem services in groundwater.

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Section: Introductionmentioning

confidence: 99%

Direct and indirect effects of the increase in atmospheric CO₂and temperature on groundwater organisms

Schmidt,

Svátková,

Kodeš

et al. 2023

Preprint

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show abstract

“…Groundwater usually contains high concentrations of dissolved inorganic carbon (DIC; Boerner & Gates, ; Macpherson, ) and has been recognized as an important source of carbon dioxide (CO 2 ) in riverine systems, particularly in small headwater streams (Hotchkiss et al, ; Winterdahl et al, ). Direct inputs of CO 2 produced in catchment soils and delivered via subsurface and shallow groundwater flow to surface waters can result in high fluvial and in‐lake CO 2 concentrations (Leith et al, ; Maberly et al, ; Weyhenmeyer et al, ).…”

Section: Introductionmentioning

confidence: 99%

Groundwater Carbon Within a Boreal Catchment: Spatiotemporal Variability of a Hidden Aquatic Carbon Pool

et al. 2020

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Groundwater is an essential resource providing water for societies and sustaining surface waters. Although groundwater at intermediate depth could be highly influential at regulating lake and river surface water chemistry, studies quantifying organic and inorganic carbon (C) species in intermediate depth groundwater are still rare. Here, we quantified dissolved and gaseous C species in the groundwater of a boreal catchment at 3-to 20-m depth. We found that the partial pressure of carbon dioxide (pCO 2 ), the stable carbon isotopic composition of dissolved inorganic carbon (δ 13 C-DIC), and pH showed a dependency with depth. Along the depth profile, a negative relationship was observed between pCO 2 and δ 13 C-DIC and between pCO 2 and pH. We attribute the negative pCO 2 -pH relationship along the depth gradient to increased silicate weathering and decreased soil respiration. Silicate weathering consumes carbon dioxide (CO 2 ) and release base cations, leading to increased pH and decreased pCO 2 . We observed a positive relationship between δ 13 C-DIC and depth, potentially due to diffusion-related fractionation in addition to isotopic discrimination during soil respiration. Soil CO 2 may diffuse downward, resulting in a fractionation of the δ 13 C-DIC. Additionally, the dissolved organic carbon at greater depth may be recalcitrant consisting of old degraded material with a greater fraction of the heavier C isotope. Our study provides increased knowledge about the C biogeochemistry of groundwater at intermediate depth, which is important since these waters likely contribute to the widespread CO 2 oversaturation in boreal surface waters. Plain Language SummaryGroundwater is the second largest reservoir of freshwater on Earth, sustaining rivers and lakes and providing water for humans. Groundwater can have high concentrations of carbon and be a source of carbon dioxide, both to surface waters and to the atmosphere. We performed our study to get a better understanding of how much carbon and carbon dioxide there is in groundwater at intermediate depths, between 3 and 20 m, as this water will eventually reach downstream rivers and lakes. Our results show that the groundwater in the studied catchment contained much higher levels of carbon dioxide than the atmosphere. We also observed large variation in the concentrations of carbon dioxide at different depths and at different locations across the catchment. Several factors are responsible for the observed carbon dioxide variations, with soil respiration and weathering of silicate minerals being the most important ones. Our study provides a better understanding of the distribution and dynamics of carbon at intermediate depth groundwater, which is important since it is an essential regulator of surface water chemistry in lakes and rivers, and indirectly being a source of carbon dioxide to the atmosphere.

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Assessment of Groundwater Aquifer Impact from Artificial Lagoons and the Reuse of Wastewater in Qatar

Al-Jabiry¹,

Bailey²,

Young³

2022

Sustainable Energy-Water-Environment Nexus in Deserts

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Temporal dynamics of groundwater-dissolved inorganic carbon beneath a drought-affected braided stream: Platte River case study

Cited by 5 publications

References 63 publications

Direct and indirect effects of the increase in atmospheric CO₂and temperature on groundwater organisms

Direct and indirect effects of the increase in atmospheric CO₂and temperature on groundwater organisms

Groundwater Carbon Within a Boreal Catchment: Spatiotemporal Variability of a Hidden Aquatic Carbon Pool

Assessment of Groundwater Aquifer Impact from Artificial Lagoons and the Reuse of Wastewater in Qatar

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Temporal dynamics of groundwater-dissolved inorganic carbon beneath a drought-affected braided stream: Platte River case study

Cited by 5 publications

References 63 publications

Direct and indirect effects of the increase in atmospheric CO2and temperature on groundwater organisms

Direct and indirect effects of the increase in atmospheric CO2and temperature on groundwater organisms

Groundwater Carbon Within a Boreal Catchment: Spatiotemporal Variability of a Hidden Aquatic Carbon Pool

Assessment of Groundwater Aquifer Impact from Artificial Lagoons and the Reuse of Wastewater in Qatar

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Product

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Direct and indirect effects of the increase in atmospheric CO₂and temperature on groundwater organisms

Direct and indirect effects of the increase in atmospheric CO₂and temperature on groundwater organisms