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Creator |
2b59c59b8b188fbe2c6521f3fc64e944 |
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Creator |
ext-dd646ba9024f6e41cfbcd6167572d1b2 |
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Creator |
ext-0752936c6716f901190b9bb3d7c31429 |
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Creator |
ext-75d47840fd3962131764e2bfaea4120a |
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Creator |
ext-09ac68b8b69af977b8684ec90d7e2ff9 |
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Creator |
ext-478c0bf0ef656392d3f1f7f79d815828 |
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Creator |
ext-840e0677aeeef779b11095bca063ccc2 |
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Creator |
ext-977f4e3d692b3f7521b510573227d431 |
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Creator |
ext-eeceef7681796cbcacd5278a49d25950 |
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Date |
2011-06-15 |
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Is Part Of |
p00167037 |
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Is Part Of |
repository |
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abstract |
In order to constrain the origin and fluxes of elements carried by rivers of high
latitude permafrost-dominated areas, major and trace element concentrations as well
as Sr and U isotopic ratios were analyzed in the dissolved load of two Siberian rivers
(Kochechum and Nizhnyaya Tunguska) regularly sampled over two hydrological cycles
(2005–2007). Large water volumes of both rivers were also collected in spring 2008
in order to perform size separation through dialysis experiments. This study was completed
by spatial sampling of the Kochechum watershed carried out during summer and by a
detailed analysis of the main hydrological compartments of a small watershed. From
element concentration variations along the hydrological cycle, different periods can
be marked out, matching hydrological periods. During winter baseflow period (October
to May) there is a concentration increase for major soluble cations and anions by
an order of magnitude. The spring flood period (end of May-beginning of June) is marked
by a sharp concentration decrease for soluble elements whereas dissolved organic carbon
and insoluble element concentrations strongly increase.
When the spring flood discharge occurs, the significant increase of aluminum and iron
concentrations is related to the presence of organo-mineral colloids that mobilize
insoluble elements. The study of colloidal REE reveals the occurrence of two colloid
sources successively involved over time: spring colloids mainly originate from the
uppermost organic-rich part of soils whereas summer colloids rather come from the
deep mineral horizons. Furthermore, U and Sr isotopic ratios together with soluble
cation budgets in the Kochechum river impose for soluble elements the existence of
three distinct fluxes over the year: (a) at the spring flood a surface flux coming
from the leaching of shallow organic soil levels and containing a significant colloidal
component (b) a subsurface flux predominant during summer and fall mainly controlled
by water–rock interactions within mineral soils and (c) a deep groundwater flux predominant
during winter which enters large rivers through unfrozen permafrost-paths. Detailed
study of the Kochechum watershed suggests that the contribution of this deep flux
strongly depends on the depth and continuous nature of the permafrost. |
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authorList |
authors |
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issue |
12 |
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status |
peerReviewed |
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volume |
75 |
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type |
AcademicArticle |
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type |
Article |
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label |
Bagard, Marie-Laure ; Chabaux, François; Pokrovsky, Oleg S.; Viers, Jérome; Prokushkin,
Anatoly S.; Stille, Peter; Rihs, Sophie; Schmitt, Anne-Désirée and Dupré, Bernard
(2011). Seasonal variability of element fluxes in two Central Siberian rivers draining
high latitude permafrost dominated areas. Geochimica et Cosmochimica Acta, 75(12)
pp. 3335–3357. |
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label |
Bagard, Marie-Laure ; Chabaux, François; Pokrovsky, Oleg S.; Viers, Jérome; Prokushkin,
Anatoly S.; Stille, Peter; Rihs, Sophie; Schmitt, Anne-Désirée and Dupré, Bernard
(2011). Seasonal variability of element fluxes in two Central Siberian rivers draining
high latitude permafrost dominated areas. Geochimica et Cosmochimica Acta, 75(12)
pp. 3335–3357. |
| 39816 |
Title |
Seasonal variability of element fluxes in two Central Siberian rivers draining high
latitude permafrost dominated areas |
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in dataset |
oro |