Northern latitude chemical weathering rates: clues from the Mackenzie River Basin, Canada

Millot, Romain; Gaillardet, Jérôme; Dupré, Bernard; Allègre, Claude J.

doi:10.1016/s0016-7037(02)01207-3

Cited by 317 publications

(267 citation statements)

References 26 publications

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“…Environ Earth Sci (2015Sci ( ) 74:2369Sci ( -2379Sci ( 2377 to the Brahmaputra reported by Gaillardet et al (1999), while it is 2-3 times than that of Yangtze, Mackenzie, and the Indus Millot et al 2003). The study area is about 0.15 9 10 6 km 2 , accounting for 0.1 % of the global land surface area.…”

Section: Comparisonmentioning

confidence: 82%

Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

et al. 2015

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The study focuses on the chemical compositions of the river waters in the middle and upper reaches of the Yarlung Tsangpo river system. Samples were collected in two periods along the river system to analyze the spatiotemporal variation characteristics and to determine the weathering processes and CO 2 consumption. The results show that the chemical facies of river waters are dominated by Ca-HCO 3 type and the TDS values cover a wide range of 98.2-619.8 mg/l with an average value of 268.6 mg/l, which is higher than that of the global river waters. There are three major reservoirs (carbonates, evaporites, and silicates) contributing to the major ions, and the predominances of the reservoirs of different rivers show spatial heterogeneity. The chemical weathering rates of silicates and carbonates are 3.43 and 4.49 t/km 2 /year, respectively. Overall, the middle and upper reaches of Yarlung Tsangpo are responsible for 0.3 and 0.16 % of global atmospheric CO 2 consumption by silicates (1.7 9 10 5 mol/ km 2 /year) and carbonates (1.27 9 10 5 mol/km 2 /year), respectively. In addition, the chemical weathering fluxes of the catchments consume atmospheric CO 2 of 0.5456 Tg C/year, accounting for 0.14 % of the total organic carbon flux to the oceans by rivers globally.

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Section: Comparisonmentioning

confidence: 82%

Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

et al. 2015

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“…In contrast, chemical weathering rates were significantly reduced in North America due to persistent ice coverage during the last glacial period (Marshall and Clark, 2002). At the same time non-glaciated North American regions experienced colder climatic conditions, which are also expected to have resulted in reduced chemical weathering rates (Tranter et al, 2002;Millot et al, 2003;White et al, 2003;West et al, 2005;Gislason et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Retreat of the Laurentide ice sheet tracked by the isotopic composition of Pb in western North Atlantic seawater during termination 1

Gutjahr¹,

Halliday²,

Keigwin³

2009

Earth and Planetary Science Letters

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“…Dominance of calcium and sodium among base cations and the dominance of sulfate and alkalinity mainly as bicarbonate among anions suggest that dissolution of carbonate and aluminosilicate coupled with sulfide oxidation within the basin appeared as a dominant geochemical process which controls the major solutes. Sulfide oxidation coupled with carbonate dissolution has been observed in subglacial drainage basins within Himalaya and other glacierized basins of the world (Tranter and Raiswell 1991;Bartarya 1993;Tranter et al 1993;Fairchild et al 1994;Galy and France-Lanord 1999;Hasnain and Thayyen 1999;Pandey et al 1999;Chen et al 2002;Hodson et al 2002;Millot et al 2003;Bhatt et al 2000Bhatt et al , 2008Bhatt et al , 2009Bhatt et al , 2014aWolff-Boenisch et al 2009). …”

Section: Hypothesis 3: Weathering Extent and Controlling Parametersmentioning

confidence: 99%

Chemistry of Supraglacial Ponds in the Debris-Covered Area of Lirung Glacier in Central Nepal Himalayas

2015

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Glacial meltwater samples were collected from 15 supraglacial ponds at elevations ranging between 3989 and 4292 m above sea level in the debris-covered area of Lirung glacier in central Nepal Himalayas, from November 2010 to October 2011 on a bimonthly basis. We examined elevation trends, and their control by seasonality, dominant geochemical processes, and seasonal dynamics in these supraglacial ponds. Concentration of some parameters showed a decreasing trend with elevation but with high variability and modulation by seasons, being more prevalent in the post-monsoon. Sulfate is the only parameter showing significant elevation trends regardless of the season, although the trend is also affected by the monsoon. The concentrations of major chemical solutes were highest during post-monsoon season and lower in the pre-monsoon and monsoon seasons, indicating influence of seasonality on dissolution, dilution, and hydrological processes. Contribution to chemical loads from marine aerosols to these pond water appeared to be minor except for sodium and magnesium. Chemical weathering of carbonate and silicate minerals fueled by dissolution of pyrite appeared as the dominant geochemical processes.

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Northern latitude chemical weathering rates: clues from the Mackenzie River Basin, Canada

Cited by 317 publications

References 26 publications

Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

Retreat of the Laurentide ice sheet tracked by the isotopic composition of Pb in western North Atlantic seawater during termination 1

Chemistry of Supraglacial Ponds in the Debris-Covered Area of Lirung Glacier in Central Nepal Himalayas

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