Seasonal hydrology drives rapid shifts in the flux and composition of dissolved and particulate organic carbon and major and trace ions in the Fraser River, Canada

Voß, Britta; Peucker‐Ehrenbrink, Bernhard; Eglinton, T. I.; Spencer, Robert G. M.; Bulygina, E. B.; Lamborg, Carl H.; Ganguli, Priya M.; Montluçon, Daniel B.; Marsh, Stephen; Gillies, S. L.; Fanslau, J.; Epp, A.; Luymes, R.

doi:10.5194/bg-12-5597-2015

Cited by 29 publications

(33 citation statements)

References 94 publications

(120 reference statements)

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“…During the high water discharge period, the δ 13 C signature was generally more negative (Figure f). POC typically arises in response to water discharge due to sediment remobilization and erosional inputs of POC from terrestrial sources (Voss et al, ), which would be expected to have more negative δ 13 C values due to higher yields of C3 vegetation (Peterson et al, ).…”

Section: Discussionmentioning

confidence: 99%

Hydrological Controls on the Seasonal Variability of Dissolved and Particulate Black Carbon in the Altamaha River, GA

et al. 2018

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Rivers play an important role in the transport of organic carbon from terrestrial to marine environments. A significant portion of this material is black carbon (BC), a residue of incomplete biomass and fossil fuel combustion. BC is mobilized in fluvial systems as both particulate BC (PBC) and dissolved BC (DBC), and the export of BC to coastal environments may have significant implications for carbon cycling in marine environments. However, while little is known regarding the potential connectivity between riverine export of PBC and DBC or the potential importance of such a relationship in constraining future BC budgets, current knowledge suggests that fluvial export of PBC and DBC are decoupled in small fire-impacted watersheds. This study aims to further address this subject on a larger watershed scale. For this study, 13 monthly samples were collected (September 2015 to September 2016) near the mouth of the Altamaha River, Georgia. PBC and DBC were characterized using the benzenze polycarboxylic acid method. Seasonal hydrology and regional shifts in storm events play an important role for both PBC and DBC export during high flow months. The DBC concentrations were comparable among wet and dry seasons, whereas evidence of seasonal salt water intrusions suggests an additional estuarine contribution of PBC at the sampling location. The DBC and PBC fluxes were generally coupled, although this pattern was disrupted during initial storm pulses. While this is the first report of potential coupling between DBC and PBC export, environmental drivers controlling this behavior between DBC and PBC remain to be constrained.

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Section: Discussionmentioning

confidence: 99%

Hydrological Controls on the Seasonal Variability of Dissolved and Particulate Black Carbon in the Altamaha River, GA

et al. 2018

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“…Recovered sediment weights were used to calculate POC concentrations and POC fluxes. This method of suspended sediment collection has been extensively employed to isolate sufficient material for isotopic analyses [Bouchez et al, 2014;Galy et al, 2011;Ponton et al, 2014]; however, it is not fully quantitative, particularly at sediment concentrations <10 mg L À1 [Voss et al, 2015]. Therefore, the resultant POC concentrations and fluxes are conservative estimates.…”

Section: Field Sampling Of Water and Sedimentsmentioning

confidence: 99%

Biological and land use controls on the isotopic composition of aquatic carbon in the Upper Mississippi River Basin

Voß

Wickland

Aiken

et al. 2017

Global Biogeochemical Cycles

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Riverine ecosystems receive organic matter (OM) from terrestrial sources, internally produce new OM, and biogeochemically cycle and modify organic and inorganic carbon. Major gaps remain in the understanding of the relationships between carbon sources and processing in river systems. Here we synthesize isotopic, elemental, and molecular properties of dissolved organic carbon (DOC), particulate organic carbon (POC), and dissolved inorganic carbon (DIC) in the Upper Mississippi River (UMR) system above Wabasha, MN, including the main stem Mississippi River and its four major tributaries (Minnesota, upper Mississippi, St. Croix, and Chippewa Rivers). Our goal was to elucidate how biological processing modifies the chemical and isotopic composition of aquatic carbon pools during transport downstream in a large river system with natural and man‐made impoundments. Relationships between land cover and DOC carbon‐isotope composition, absorbance, and hydrophobic acid content indicate that DOC retains terrestrial carbon source information, while the terrestrial POC signal is largely replaced by autochthonous organic matter, and DIC integrates the influence of in‐stream photosynthesis and respiration of organic matter. The UMR is slightly heterotrophic throughout the year, but pools formed by low‐head navigation dams and natural impoundments promote a shift toward autotrophic conditions, altering aquatic ecosystem dynamics and POC and DIC compositions. Such changes likely occur in all major river systems affected by low‐head dams and need to be incorporated into our understanding of inland water carbon dynamics and processes controlling CO2 emissions from rivers, as new navigation and flood control systems are planned for future river and water resources management.

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“…However, unlike many regions of the world, the boreal and subarctic river regions exhibit extreme seasonal variations in discharge and chemical elements concentrations (see Voronkov et al, 1966;Gordeev and Sidorov, 1993;Gordeev et al, 1996;Gislason et al, 1996;Gaillardet et al, 2003;Rember and Trefry, 2004;Zakharova et al, 2005Zakharova et al, , 2007Bagard et al, 2011Bagard et al, , 2013Prokushkin et al, 2011;Guo et al, 2004bGuo et al, , 2007Olefeldt and Roulet, 2012;Voss et al, 2015). The quantitative description of these systems, therefore, requires an understanding of how weathering rates and riverine fluxes of major and trace elements as well as their main carrier (organic carbon) vary seasonally.…”

Section: Introductionmentioning

confidence: 99%

Permafrost coverage, watershed area and season control of dissolved carbon and major elements in western Siberian rivers

et al. 2015

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Abstract. Analysis of organic and inorganic carbon (DOC and DIC, respectively), pH, Na, K, Ca, Mg, Cl, SO4 and Si in ~ 100 large and small rivers (< 10 to ≤ 150 000 km2) of western Siberia sampled in winter, spring, and summer over a more than 1500 km latitudinal gradient allowed establishing main environmental factors controlling the transport of river dissolved components in this environmentally important region, comprising continuous, discontinuous, sporadic and permafrost-free zones. There was a significant latitudinal trend consisting in a general decrease in DOC, DIC, SO4, and major cation (Ca, Mg, Na, K) concentration northward, reflecting the interplay between groundwater feeding (detectable mostly in the permafrost-free zone, south of 60° N) and surface flux (in the permafrost-bearing zone). The northward decrease in concentration of inorganic components was strongly pronounced both in winter and spring, whereas for DOC, the trend of concentration decrease with latitude was absent in winter, and less pronounced in spring flood than in summer baseflow. The most significant decrease in K concentration from the southern (< 59° N) to the northern (61–67° N) watersheds occurs in spring, during intense plant litter leaching. The latitudinal trends persisted for all river watershed size, from < 100 to > 10 000 km2. Environmental factors are ranked by their increasing effect on DOC, DIC, δ13CDIC, and major elements in western Siberian rivers as follows: watershed area < season < latitude. Because the degree of the groundwater feeding is different between large and small rivers, we hypothesize that, in addition to groundwater feeding of the river, there was a significant role of surface and shallow subsurface flow linked to plant litter degradation and peat leaching. We suggest that plant-litter- and topsoil-derived DOC adsorbs on clay mineral horizons in the southern, permafrost-free and discontinuous/sporadic permafrost zone but lacks the interaction with minerals in the continuous permafrost zone. It can be anticipated that, under climate warming in western Siberia, the maximal change will occur in small (< 1000 km2 watershed) rivers DOC, DIC and ionic composition and this change will be mostly pronounced in summer.

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Seasonal hydrology drives rapid shifts in the flux and composition of dissolved and particulate organic carbon and major and trace ions in the Fraser River, Canada

Cited by 29 publications

References 94 publications

Hydrological Controls on the Seasonal Variability of Dissolved and Particulate Black Carbon in the Altamaha River, GA

Hydrological Controls on the Seasonal Variability of Dissolved and Particulate Black Carbon in the Altamaha River, GA

Biological and land use controls on the isotopic composition of aquatic carbon in the Upper Mississippi River Basin

Permafrost coverage, watershed area and season control of dissolved carbon and major elements in western Siberian rivers

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