Seasonality of bedrock weathering chemistry and CO2 consumption in a small watershed, the White River, Vermont

Douglas, Thomas A.

doi:10.1016/j.chemgeo.2006.01.024

Cited by 11 publications

(4 citation statements)

References 49 publications

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“…On the contrary, the relative weathering rate of silicates increases during lean flow period possibly due to relatively higher contribution from groundwater, which leaches more silicates due to larger rock-water interaction time. The variation in weathering of bedrocks with season is found to be an important factor for seasonal variation in the chemistry of river water during geochemical studies in different river basins (Douglas, 2006;Tipper et al, 2006;Rai and Singh, 2007).…”

Section: Causes For Temporal Variation Inmentioning

confidence: 99%

Temporal variations in Sr and ⁸⁷Sr/⁸⁶Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Tripathy

Goswami

Singh

et al. 2010

Hydrological Processes

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Abstract:The headwaters of the Ganga (the Alaknanda, Bhagirathi and the Ganga) were analysed for their dissolved major ions, Sr and 87 Sr/ 86 Sr on a biweekly to monthly basis over a period of one year to determine their temporal variations and the factors contributing to them. The concentrations of major ions and Sr show significant seasonal variation with lower values during monsoon period in all the three rivers. A similar trend is also observed for 87 Sr/ 86 Sr and Na Ł /Ca (Na Ł DNa r -Cl r ) suggesting relatively lower contribution of Sr and Na from silicates (which are more radiogenic in Sr) during monsoon. Budget calculations show that silicate derived dissolved Sr (Sr s ) in the river Ganga, Alaknanda and the Bhagirathi varied from 10 š 4 to 27 š 11, 7 š 3 to 30 š 12, 16 š 6 to 57 š 23% of measured Sr respectively with lower values during monsoon. The relative decrease in silicate erosion compared to carbonate during monsoon can result from several factors, these include higher dissolution kinetics of the carbonates, lower water-rock interaction time and availability of larger area for weathering.The annual discharge weighted Sr flux derived from the time series data is higher by ¾20% from that based on peak flow Sr, and lower by ¾40% compared to that derived from lean flow Sr concentration. The area-normalized annual flux of dissolved Sr from the Ganga at Rishikesh is about five times its flux at Rajshahi (Bangladesh) and a few other major global rivers, such as the Amazon, indicating higher erosion rate over the Himalaya.

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Section: Causes For Temporal Variation Inmentioning

confidence: 99%

Temporal variations in Sr and ⁸⁷Sr/⁸⁶Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Tripathy

Goswami

Singh

et al. 2010

Hydrological Processes

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“…Studies that extrapolate yearly averages of solute fluxes from a single season or less of sampling may miss seasonal and climatic variations that affect bedrock weathering (e.g. Douglas, 2006;Tipper et al, 2006;Eiriksdottir et al, 2008). (2) Corrections for biomass effects must be included.…”

Section: Quantification Of Co 2 Consumption By Chemical Weatheringmentioning

confidence: 99%

“…Studies that extrapolate yearly averages of solute fluxes from a single season or less of sampling may miss seasonal and climatic variations that affect bedrock weathering (e.g. Douglas, ; Tipper et al ., ; Eiriksdottir et al ., ).Corrections for biomass effects must be included. Base cations, SiO 2 , and HCO 3 – may be used as proxies for the quantification of atmospheric CO 2 consumption by chemical weathering.…”

Section: Introductionmentioning

confidence: 99%

Mass‐balance modeling of mineral weathering rates and CO₂ consumption in the forested, metabasaltic Hauver Branch watershed, Catoctin Mountain, Maryland, USA

Price

Rice

Szymanski

2013

Earth Surf Processes Landf

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Mineral weathering rates and a forest macronutrient uptake stoichiometry were determined for the forested, metabasaltic Hauver Branch watershed in north‐central Maryland, USA. Previous studies of Hauver Branch have had an insufficient number of analytes to permit determination of rates of all the minerals involved in chemical weathering, including biomass. More equations in the mass‐balance matrix were added using existing mineralogic information. The stoichiometry of a deciduous biomass term was determined using multi‐year weekly to biweekly stream‐water chemistry for a nearby watershed, which drains relatively unreactive quartzite bedrock. At Hauver Branch, calcite hosts ~38 mol% of the calcium ion (Ca2+) contained in weathering minerals, but its weathering provides ~90% of the stream water Ca2+. This occurs in a landscape with a regolith residence time of more than several Ka (kiloannum). Previous studies indicate that such old regolith does not typically contain dissolving calcite that affects stream Ca2+/Na+ ratios. The relatively high calcite dissolution rate likely reflects dissolution of calcite in fractures of the deep critical zone. Of the carbon dioxide (CO2) consumed by mineral weathering, calcite is responsible for approximately 27%, with the silicate weathering consumption rate far exceeding that of the global average. The chemical weathering of mafic terrains in decaying orogens thus may be capable of influencing global geochemical cycles, and therefore, climate, on geological timescales. Based on carbon‐balance calculations, atmospheric‐derived sulfuric acid is responsible for approximately 22% of the mineral weathering occurring in the watershed. Our results suggest that rising air temperatures, driven by global warming and resulting in higher precipitation, will cause the rate of chemical weathering in the Hauver Branch watershed to increase until a threshold temperature is reached. Beyond the threshold temperature, increased recharge would produce a shallower groundwater table and reduced chemical weathering rates. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Vegetation is dominated by conifers and population is sparse, making the region remarkably pristine. Further samples derive from White River, Vermont, USA (Douglas 2006). Data from Europe have been supplemented by considering the Seine (France) (Roy et al 1999) and Salso (central Sicily, Italy) rivers (Favara et al 2000).…”

Section: Origin Of Datamentioning

confidence: 99%

Another Look at the Chemical Relationships in the Dissolved Phase of Complex River Systems

Buccianti¹,

Egozcue²,

Pawlowsky‐Glahn³

Progress in Geomathematics

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Large rivers are a major pathway for the erosion products of continents to reach the oceans. The riverine transport of dissolved and particulate materials is generally related to a large number of interactions involving climate, hydrological, physico-chemical and biological aspects. Consequently, the investigation of large rivers allows the erosion processes at a global scale to be addressed, with information about biogeochemical cycles of the elements, weathering rates, physical erosion rates and CO 2 consumption by the acid degradation of continental rocks. Today, good databases exist for the major dissolved ions in the world's largest rivers. Since concentration of ions in river waters has to be considered in a compositional context, it is necessary to study the implications of considering the simplex, with its proper geometry, as the natural sample space. Using the additive (alr) or the isometric (ilr) log-ratio transformations, a composition can be represented as a real vector; but only in the second case can these coordinates be mapped onto orthogonal axes.Using data related to the dissolved load of some of the most important rivers in the world, the relationships among the major ions frequently used in molar ratio mixing diagrams have been investigated with alternative tools. Following the balances approach, an investigation of the properties of aqueous solutions of electrolytes that are often treated in terms of equilibrium constants is undertaken. The role played by the source-rain water, weathering of silic, carbonatic and evaporitic rocks, pollution- [475][476][477][478][479][480][481][482][483][484][485][486][487][488] from which elements and chemical species can potentially be derived, has been checked through an investigation of a probabilistic model able to describe the relationships among the different components that contribute to the chemical composition of a river water sample.

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Seasonality of bedrock weathering chemistry and CO2 consumption in a small watershed, the White River, Vermont

Cited by 11 publications

References 49 publications

Temporal variations in Sr and ⁸⁷Sr/⁸⁶Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Temporal variations in Sr and ⁸⁷Sr/⁸⁶Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Mass‐balance modeling of mineral weathering rates and CO₂ consumption in the forested, metabasaltic Hauver Branch watershed, Catoctin Mountain, Maryland, USA

Another Look at the Chemical Relationships in the Dissolved Phase of Complex River Systems

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Seasonality of bedrock weathering chemistry and CO2 consumption in a small watershed, the White River, Vermont

Cited by 11 publications

References 49 publications

Temporal variations in Sr and 87Sr/86Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Temporal variations in Sr and 87Sr/86Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Mass‐balance modeling of mineral weathering rates and CO2 consumption in the forested, metabasaltic Hauver Branch watershed, Catoctin Mountain, Maryland, USA

Another Look at the Chemical Relationships in the Dissolved Phase of Complex River Systems

Contact Info

Product

Resources

About

Temporal variations in Sr and ⁸⁷Sr/⁸⁶Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Temporal variations in Sr and ⁸⁷Sr/⁸⁶Sr of the Ganga headwaters: estimates of dissolved Sr flux to the mainstream

Mass‐balance modeling of mineral weathering rates and CO₂ consumption in the forested, metabasaltic Hauver Branch watershed, Catoctin Mountain, Maryland, USA