Weathering implications of water chemistry in an arctic–alpine environment, northern Sweden

Darmody, Robert G.; Thorn, Colin E.; Harder, R.L.; Schlyter, J.P.L.; Dixon, John C.

doi:10.1016/s0169-555x(00)00002-7

Cited by 73 publications

(60 citation statements)

References 18 publications

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“…La no existencia de suelo helado bajo una cubierta nival de larga duración, hace pensar en la importancia que puede tener la alteración química en esos sectores de un suelo, muy bien hidratado durante la mayor parte del año. En ese sentido, cabría investigar los resultados de esa alteración analizando las aguas pronivales, que han dado resultados muy positivos en otras montañas (Williams, 1949;Darmody et al, 2000, entre otras muchas publicaciones sobre el tema), y quizás sería ésa la razón fundamental que explicaría por qué hay tanto material fino en el fondo y frente de estos neveros permanentes.…”

Section: Discussionunclassified

Cobertura nival y distribución de las temperaturas en el suelo en las cumbres de la Sierra de Guadarrama

Pablo

Estremera

2013

CIG

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Section: Discussionunclassified

Cobertura nival y distribución de las temperaturas en el suelo en las cumbres de la Sierra de Guadarrama

Pablo

Estremera

2013

CIG

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“…While making the claim for the dominance of chemical processes, Rapp was able only to provide skeletal data on the prevailing chemical mechanisms. Retaining Rapp's (1960) computation assumptions, but substituting a more detailed data set of solute values, Darmody et al (2000a) produced a revised value of 19Ð2 t km 2 year 1 for the denudation rate in Kärkevagge, compared with Rapp's (1960) original estimate of 26 t km 2 year 1 . Both estimates indicate that Kärkevagge experiences chemical weathering rates that are not particularly low or high by global standards.…”

Section: Discussionmentioning

confidence: 99%

“…The pebble investigation follows a technique presented by Caine (1979a). Use of rock disks, pebble bags, water quality studies (Darmody et al, 2000a;Campbell et al, 2001), and mineralogical investigation reflects an attempt to span the range of ways in which chemical weathering has been investigated, as well as embrace Caine's (1974) notion that, in alpine contexts, mass loss may be envisaged as passing through three cascading subsystems or sediment fluxes, viz. coarse debris ( 8 mm), fine sediment ( 8 mm), and geochemical.…”

Section: Introductionmentioning

confidence: 99%

Weathering rates of buried machine‐polished rock disks, Kärkevagge, Swedish Lapland

Thorn

Darmody

Dixon

et al. 2002

Earth Surf Processes Landf

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Some 48 dolomite, 37 granite, and 19 limestone machine-polished disks were buried at soil horizon boundaries in 16 soil pits to maximum depths of 0Ð5-0Ð6 m within Kärkevagge, a presently periglacial, glaciated trough in Arctic Sweden. The objective of the ongoing study is to determine near-surface 'potential' weathering rates beneath birch forest, Dryas heath, heath, meadow, solifluction meadow, and willow vegetation cover types. Selected disks were excavated after 1 year, and all disks were excavated after 4 or 5 years.The limestone disks weathered fastest, followed closely by the dolomite disks, but the granite disks weathered at much slower rates. Mean annual percentage mass loss over 4 or 5 years was 0Ð473 š 0Ð145% (two standard errors) for dolomite disks, 0Ð032 š 0Ð005% (two standard errors) for granite disks, and 1Ð104 š 0Ð446% (two standard errors) for limestone disks. For dolomite disks the Dryas heath and heath environments weathered the most slowly, a trend that was generally followed by the granite disks. Poor drainage (i.e. increasing wetness) and decreasing pH were found to promote dolomite weathering rates in a statistically significant manner. Surficial and subsurface weathering rates at individual sites were generally found to be correlated for dolomite, but not granite.

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“…Chemical weathering generally is considered to increase in warm and wet climates, although this process can also be active under cold climatic conditions (e.g., Darmody et al, 2000;Hall et al, 2002). Nonetheless, temperature and precipitation have been shown to be strong controls on the rates of chemical weathering (e.g., White and Blum, 1995).…”

Section: Geochemical Indices As Proxy For Environmental Changesmentioning

confidence: 99%

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

Minyuk¹,

Borkhodoev²,

Wennrich

2014

Clim. Past

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Abstract. Geochemical analyses were performed on sediments recovered by deep drilling at Lake El'gygytgyn in central Chukotka, northeastern Russia (67 • 30 N; 172 • 05 E). Major and rare element concentrations were determined using X-ray fluorescence spectroscopy (XRF) on the < 250 µm fraction from 617 samples dated to ca. 440 and 125 ka, which approximates marine isotope stages (MIS) 11 to 6. The inorganic geochemistry indicates significant variations in elemental composition between glaciations and interglaciations. Interglacial sediments are characterized by high contents of SiO 2 , Na 2 O, CaO, K 2 O, and Sr and are depleted in Al 2 O 3 , Fe 2 O 3 , TiO 2 , and MgO. An extreme SiO 2 enrichment during MIS 11.3 and 9.3 was caused by an enhanced flux of biogenic silica (BSi). The geochemical structure of MIS 11 shows similar characteristics as seen in MIS 11 records from Lake Baikal (southeastern Siberia) and Antarctic ice cores, thereby arguing for the influence of global forcings on these records. High sediment content of TiO 2 , Fe 2 O 3 , MgO, Al 2 O 3 , LOI, Ni, Cr, and Zr typifies glacial stages, with the most marked increases during MIS 7.4 and 6.6. Reducing conditions during glacial times are indicated by peaks in the Fe 2 O 3 content and coinciding low Fe 2 O 3 /MnO ratios. This conclusion also is supported by P 2 O 5 and MnO enrichment, indicating an increased abundance of authigenic, fine-grained vivianite. Elemental ratios (CIA, CIW, PIA, and Rb/Sr) indicate that glacial sediments are depleted in mobile elements, like Na, Ca, K and Sr. This depletion was caused by changes in the sedimentation regime and thus reflects environmental changes.

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Weathering implications of water chemistry in an arctic–alpine environment, northern Sweden

Cited by 73 publications

References 18 publications

Cobertura nival y distribución de las temperaturas en el suelo en las cumbres de la Sierra de Guadarrama

Cobertura nival y distribución de las temperaturas en el suelo en las cumbres de la Sierra de Guadarrama

Weathering rates of buried machine‐polished rock disks, Kärkevagge, Swedish Lapland

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

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