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Corpus Systématique Végétale

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Sources and the flux pattern of dissolved carbon in rivers of the Yenisey basin draining theCentral Siberian Plateau

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Mots-clés d'auteur
  • dissolved carbon
  • riverine flux
  • permafrost
  • Central Siberian Plateau
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  • A S Prokushkin 1,2
  • O S Pokrovsky 3
  • L S Shirokova 3
  • M A Korets 1
  • J Viers 3
  • S G Prokushkin 1
  • R M W Amon 4
  • G Guggenberger 5
  • W H McDowell 6
  • 1) V N Sukachev Institute of Forest SB RAS, Akademgorodok 50/28, Krasnoyarsk 660036, Russia
  • 2) Author to whom any correspondence should be addressed
  • 3) LMTG/OMP, Universit Paul Sabatier-CNRS-IRD, 14 avenue Edouard Belin, 31400 Toulouse, France
  • 4) Department of Marine Sciences, Texas A&M University at Galveston, Galveston, USA
  • 5) Institut fr Bodenkunde, Leibniz-Universitt Hannover, Herrenhuser Strae 2, 30419 Hannover, Germany
  • 6) Department of Natural Resources and the Environment, University of New Hampshire, 170 James Hall, 56 College Road, Durham, NH 03824, USA

Frequent measurements of dissolved organic (DOC) and inorganic (DIC) carbon concentrations in riversduring snowmelt, the entire ice-free season, and winter were made in five large watersheds (15000174000km2) of the Central Siberian Plateau (Yenisey River basin). These differ in the degree ofcontinuous permafrost coverage, mean annual air temperature, and the proportion of tundraand forest vegetation. With an annual DOC export from the catchment areas of 2.84.7gCm 2 as compared to an annual DIC export of 1.02.8gCm 2, DOC was the dominant component of terrigenous C released to rivers. Therewas strong temporal variation in the discharge of DOC and DIC. Like for otherrivers of the pan-arctic and boreal zones, snowmelt dominated annual fluxes,being 5571 for water runoff, 6482 for DOC and 3741 for DIC. Likewise,DOC and DIC exhibited also a strong spatial variation in C fluxes, with bothdissolved C species decreasing from south to north. The rivers of the southernpart of the plateau had the largest flow-weighted DOC concentrations amongthose previously reported for Siberian rivers, but the smallest flow-weighted DICconcentrations. In the study area, DOC and DIC fluxes were negatively correlated with thedistribution of continuous permafrost and positively correlated with mean annual airtemperature. A synthesis of literature data shows similar trends from west toeast, with an eastward decrease of dissolved C concentrations and an increasedproportion of DOC in the total dissolved C flux. It appears that there are twocontemporary limitations for river export of terrigenous C across Siberia: (1)lowproductivity of ecosystems with respect to potentially mobilizable organic C, slowweathering rates with concomitant small formation of bicarbonate, and/or wildfiredisturbance limit the pools of organic and inorganic C that can be mobilized fortransport in rivers (source-limited), and (2)mobilization of available pools of C isconstrained by low precipitation in the severe continental climate of interior Siberia(transport-limited). Climate warming may reduce the source limitation by enhancingprimary production and weathering rates, while causes leading to surmountingthe transport limitation remain debatable due to uncertainties in predictions ofprecipitation trends and other likely sources of reported increase of river discharges.

Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - ecologie animale, vegetale et microbienne
Catégories Scopus
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Public Health, Environmental and Occupational Health
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - General Environmental Science
  • 1 - Physical Sciences ; 2 - Energy ; 3 - Renewable Energy, Sustainability and the Environment
Catégories WoS
  • 1 - science ; 2 - meteorology & atmospheric sciences
  • 1 - science ; 2 - environmental sciences
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Environmental Research Letters

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