Dynamic of particulate and dissolved organic carbon in small volcanic mountainous tropical watersheds

Lloret, Emily; Dessert, Céline; Pastor, Lucie; Lajeunesse, É.; Crispi, Olivier; Gaillardet, Jérôme; Benedetti, Marc F.

doi:10.1016/j.chemgeo.2013.05.023

Cited by 64 publications

(86 citation statements)

References 106 publications

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“…The DOC concentrations for the two studied Guadeloupean rivers were reported in studies of Lloret et al (2011Lloret et al ( , 2013 The isotopic compositions of DOC in the rivers range from -35.0 to -22.9 ‰, with  13 C values, which are more depleted in 13 C during low water level than flood events.…”

Section: Doc In River Watersmentioning

confidence: 99%

“…During flood stage (Lloret et al 2011(Lloret et al , 2013, the streams are essentially fed by lixiviation of soil surface layers (represented by extracted soil solutions). During low water levels (Lloret et al, 2011(Lloret et al, , 2013, the streams are fed by groundwater (represented by soil solution collected from lysimeters).…”

Section: Doc Sources In Small Tropical Volcanic Riversmentioning

confidence: 99%

“…Surface water was sampled manually from 2007 to 2010 at different hydrological stages corresponding to low water and flood levels (Lloret et al, 2011(Lloret et al, , 2013Dessert et al, 2015). An automatic water sampler, ISCO-6712, was set up on the Capesterre River to sample the largest number of extreme meteorological and hydrological events.…”

Section: River Samplingmentioning

confidence: 99%

“…Taiwan, New Zealand, Guadeloupe), the majority part of the organic carbon export occurs during flood events (Hilton et al, 2008a;Fujii et al, 2009;Bass et al, 2011;Lloret et al, 2013). Accordingly, the sources of organic carbon exported from the catchments vary with the hydrological stage, in particular for small rivers (Lloret et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

et al. 2016

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Section: Doc In River Watersmentioning

confidence: 99%

Section: Doc Sources In Small Tropical Volcanic Riversmentioning

confidence: 99%

Section: River Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

et al. 2016

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“…Arctic rivers during the spring freshet Wickland et al, 2012), as well as in tropical catchments experiencing wet-season flushing of surface soils Laraque et al, 2013), and in small streams and headwater catchments dominated by episodic rain or snowmelt events (Carey, 2003;Wagner et al, 2008;Fellman et al, 2009;Raymond and Saiers, 2010;Jung et al, 2012;Lloret et al, 2013;Sandford et al, 2013;Pereira et al, 2014). In these scenarios, the composition of DOC is often observed to change significantly during such DOC pulses, as changing hydrologic flow paths draw upon different vegetation-and soil-derived DOC pools.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective

Voß¹

2014

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The great geologic and climatic diversity of the Fraser River basin in southwestern Canada render it an excellent location for understanding biogeochemical cycling of sediments and terrigenous organic carbon in a relatively pristine, large, temperate watershed. Sediments delivered by all tributaries have the potential to reach the ocean due to a lack of main stem lakes or impoundments, a unique feature for a river of its size. This study documents the concentrations of a suite of dissolved and particulate organic and inorganic constituents, which elucidate spatial and temporal variations in chemical weathering (including carbonate weathering in certain areas) as well as organic carbon mobilization, export, and biogeochemical transformation. Radiogenic strontium isotopes are employed as a tracer of sediment provenance based on the wide variation in bedrock age and lithology in the Fraser basin. The influence of sediments derived from the headwaters is detectable at the river mouth, however more downstream sediment sources predominate, particularly during high discharge conditions. Bulk radiocarbon analyses are used to quantify terrestrial storage timescales of organic carbon and distinguish between petrogenic and biospheric organic carbon, which is critical to assessing the role of rivers in long-term atmospheric CO 2 consumption. The estimated terrestrial residence time of biospheric organic carbon in the Fraser basin is 650 years, which is relatively short compared to other larger rivers (Amazon, Ganges-Brahmaputra) in which this assessment has been performed, and is likely related to the limited floodplain storage capacity and non-steadystate post-glacial erosion state of the Fraser River. A large portion of the dissolved inorganic carbon load of the Fraser River (>80%) is estimated to derive from remineralization of dissolved organic carbon, particularly during the annual spring freshet when organic carbon concentrations increase rapidly. This thesis establishes a baseline for carbon cycling in a largely unperturbed modern mid-latitude river system and establishes a framework for future process studies on the mechanisms of organic carbon turnover and organic matter-mineral associations in river systems.

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River geochemistry, chemical weathering, and atmospheric CO₂ consumption rates in the Virunga Volcanic Province (East Africa)

Balagizi

Darchambeau

Bouillon

et al. 2015

Geochem Geophys Geosyst

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We report a water chemistry data set from 13 rivers of the Virunga Volcanic Province (VVP) (Democratic Republic of Congo), sampled between December 2010 and February 2013. Most parameters showed no pronounced seasonal variation, whereas their spatial variation suggests a strong control by lithology, soil type, slope, and vegetation. High total suspended matter (289-1467 mg L 21 ) was recorded in rivers in the Lake Kivu catchment, indicating high soil erodibility, partly as a consequence of deforestation and farming activities. Dissolved and particulate organic carbon (DOC and POC) were lower in rivers from lava fields, and higher in nonvolcanic subcatchments. Stable carbon isotope signatures (d 13 C) of POC and DOC mean d 13 C of 222.5& and 223.5&, respectively, are the first data to be reported for the highland of the Congo River basin and showed a much higher C4 contribution than in lowland areas. Rivers of the VVP were net sources of CH 4 to the atmosphere (4-5052 nmol L 21 ). Most rivers show N 2 O concentrations close to equilibrium, but some rivers showed high N 2 O concentrations related to denitrification in groundwaters. d 13 C signatures of dissolved inorganic carbon suggested magmatic CO 2 inputs to aquifers/soil, which could have contributed to increase basalt weathering rates. This magmatic CO 2 -mediated basalt weathering strongly contributed to the high major cation concentrations and total alkalinity. Thus, chemical weathering (39.0-2779.9 t km 22 yr 21 ) and atmospheric CO 2 consumption (0.4-37.0 3 10 6 mol km 22 yr 21 ) rates were higher than previously reported in the literature for basaltic terrains.

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Dynamic of particulate and dissolved organic carbon in small volcanic mountainous tropical watersheds

Cited by 64 publications

References 106 publications

Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective

River geochemistry, chemical weathering, and atmospheric CO₂ consumption rates in the Virunga Volcanic Province (East Africa)

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Dynamic of particulate and dissolved organic carbon in small volcanic mountainous tropical watersheds

Cited by 64 publications

References 106 publications

Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective

River geochemistry, chemical weathering, and atmospheric CO2 consumption rates in the Virunga Volcanic Province (East Africa)

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River geochemistry, chemical weathering, and atmospheric CO₂ consumption rates in the Virunga Volcanic Province (East Africa)