Aerobic respiration controls on shale weathering

Stolze, Lucien; Arora, Bhavna; Dwivedi, Dipankar; Steefel, Carl I.; Zhi, Li; Carrero, Sergio; Gilbert, B.; Nico, Peter; Bill, Markus

doi:10.1016/j.gca.2022.11.002

Cited by 11 publications

(9 citation statements)

References 90 publications

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“…We acknowledge that this transformation is likely overestimating both parameters at depth due to the smoothness constraints applied to the resistivity data during the inversion and a lack of resolution (Day-Lewis et al, 2005), and that site specific variations due to changes in lithology may not be thoroughly addressed by this transfer function. Generally, our data acquired across the watershed suggests that bedrock with high fracture density is related to lower resistivity, which is likely due to enhanced weathering in those fractures (Gu et al, 2020;Stolze et al, 2023). Hence, we relate lower resistivity with higher permeability and porosity.…”

Section: Modeling Subsurface Flow Dynamicsmentioning

confidence: 68%

Variations in bedrock and vegetation cover modulate subsurface water flow dynamics of a mountainous hillslope

Uhlemann,

Peruzzo,

Chou

et al. 2023

Preprint

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Predicting the hydrological response of watersheds to climate disturbances requires a detailed understanding of the processes connecting hillslopes and streams. Using a network of soil moisture and temperature sensors, electrical resistivity tomography monitoring, and a weather station we assess the above and below-ground processes driving the hydrological response of a hillslope during snowmelt and summer monsoon. The transect covers bedrock and vegetation gradients, with a steep upper part characterized by shallow bedrock, and gentle lower part underlain by colluvium. The main vegetation cover is conifers on the upper, and grass and veratrum on the lower part. Combined with a simplified hydrological model, we show that the thin soil layer of the steep slope acts as a preferential flow path, leading to mostly shallow lateral flow, interrupted by vertical flow, mostly at tree locations, and likely facilitated by flow along fractures and roots. Vertical flow and upstream-driven groundwater dynamics are prevailing at the colluvium, presenting a very different hydrological behavior compared to the upper part. These results show that subsurface structure and features have a strong control on the hydrological response of a hillslope and that those can create considerably varying hydrological dynamics across small spatial scales.

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Section: Modeling Subsurface Flow Dynamicsmentioning

confidence: 68%

Variations in bedrock and vegetation cover modulate subsurface water flow dynamics of a mountainous hillslope

Uhlemann,

Peruzzo,

Chou

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…We acknowledge that this transformation is likely overestimating both parameters at depth due to the smoothness constraints applied to the resistivity data during the inversion and a lack of resolution (Day‐Lewis et al., 2005), and that site specific variations due to changes in lithology may not be thoroughly addressed by this transfer function. Generally, our data acquired across the watershed suggests that bedrock with high fracture density is related to lower resistivity, which is likely due to enhanced weathering in those fractures (Gu et al., 2020; Stolze et al., 2023). Hence, we relate lower resistivity with higher permeability and porosity.…”

Section: Resultsmentioning

confidence: 84%

Variations in Bedrock and Vegetation Cover Modulate Subsurface Water Flow Dynamics of a Mountainous Hillslope

Uhlemann,

Peruzzo,

Chou

et al. 2024

Water Resources Research

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Predicting the hydrological response of watersheds to climate disturbances requires a detailed understanding of the processes connecting hillslopes and streams. Using a network of soil moisture and temperature sensors, electrical resistivity tomography monitoring, and a weather station we assess the above and below‐ground processes driving the hydrological response of a hillslope during snowmelt and summer monsoon. The transect covers bedrock and vegetation gradients, with a steep upper part characterized by shallow bedrock, and gentle lower part underlain by colluvium. The main vegetation cover is conifers on the upper, and grass and veratrum on the lower part. Combined with a simplified hydrological model, we show that the thin soil layer of the steep slope acts as a preferential flow path, leading to mostly shallow lateral flow, interrupted by vertical flow, mostly at tree locations, and likely facilitated by flow along fractures and roots. Vertical flow and upstream‐driven groundwater dynamics are prevailing at the colluvium, presenting a very different hydrological behavior compared to the upper part. These results show that subsurface structure and features have a strong control on the hydrological response of a hillslope and that those can create considerably varying hydrological dynamics across small spatial scales.

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“…10 in Methods ). Fe(III) reductive dissolution,

(mol m −3 d −1 ), is complex and affected by many factors such as competitive and synergistic effects of ion adsorption on the mineral surface ( 44 ). Such surface processes are particularly important for kinetics of rock weathering, as significant evolution of exposed mineral surface area occurs over the course of weathering.…”

Section: Resultsmentioning

confidence: 99%

The primacy of temporal dynamics in driving spatial self-organization of soil iron redox patterns

Dong,

Richter,

Thompson

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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This study investigates mechanisms that generate regularly spaced iron-rich bands in upland soils. These striking features appear in soils worldwide, but beyond a generalized association with changing redox, their genesis is yet to be explained. Upland soils exhibit significant redox fluctuations driven by rainfall, groundwater changes, or irrigation. Pattern formation in such systems provides an opportunity to investigate the temporal aspects of spatial self-organization, which have been heretofore understudied. By comparing multiple alternative mechanisms, we found that regular iron banding in upland soils is explained by coupling two sets of scale-dependent feedbacks, the general principle of Turing morphogenesis. First, clay dispersion and coagulation in iron redox fluctuations amplify soil Fe(III) aggregation and crystal growth to a level that negatively affects root growth. Second, the activation of this negative root response to highly crystalline Fe(III) leads to the formation of rhythmic iron bands. In forming iron bands, environmental variability plays a critical role. It creates alternating anoxic and oxic conditions for required pattern-forming processes to occur in distinctly separated times and determines durations of anoxic and oxic episodes, thereby controlling relative rates of processes accompanying oxidation and reduction reactions. As Turing morphogenesis requires ratios of certain process rates to be within a specific range, environmental variability thus modifies the likelihood that pattern formation will occur. Projected changes of climatic regime could significantly alter many spatially self-organized systems, as well as the ecological functioning associated with the striking patterns they present. This temporal dimension of pattern formation merits close attention in the future.

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Aerobic respiration controls on shale weathering

Cited by 11 publications

References 90 publications

Variations in bedrock and vegetation cover modulate subsurface water flow dynamics of a mountainous hillslope

Variations in bedrock and vegetation cover modulate subsurface water flow dynamics of a mountainous hillslope

Variations in Bedrock and Vegetation Cover Modulate Subsurface Water Flow Dynamics of a Mountainous Hillslope

The primacy of temporal dynamics in driving spatial self-organization of soil iron redox patterns

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