Effects of asynchronous snowmelt on flushing of dissolved organic carbon: a mixing model approach

Boyer, E. W.; Hornberger, George M.; Bencala, Kenneth E.; McKnight, Diane M.

doi:10.1002/1099-1085(20001230)14:18<3291::aid-hyp202>3.0.co;2-2

Cited by 115 publications

(106 citation statements)

References 19 publications

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“…3). The lower DOC concentrations during the falling hydrograph indicate that the DOC storm response is hysteretic (Butturini et al 2006) and may, for example, reflect temporary depletion of the terrestrial DOC supply due to soilwater flushing (Hornberger et al 1994;Boyer et al 2000) or, perhaps, changes in the timing of runoff contributions from the riparian zone and hill slope during the course of a rainfall event (Hinton et al 1998;McGlynn and McDonnell 2003). DOC that appears in small streams during hydrologic events is derived primarily from allochthonous terrestrial sources (Royer and David 2005).…”

Section: Discussionmentioning

confidence: 99%

Event controlled DOC export from forested watersheds

2010

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We performed a meta-data analysis to investigate the importance of event based fluxes to DOC export from forested watersheds. A total of 30 small eastern United States forested watersheds with no wetland component, with a total of 5,176 DOC and accompanying discharge measurements were used in this analysis. There is a clear increase in DOC concentration during hydrologic events (storms and snow melt) that follows a power relationship. We estimate that 86% of DOC is exported during events. The majority (70%) of this event based DOC flux occurs during the rising hydrograph and during large events. Events with a discharge greater than 1.38 cm day -1 make up only 4.8% of the annual hydrograph, yet are responsible for 57% of annual DOC flux. The relationship between event discharge and both DOC concentration and flux is also regulated by temperature and antecedent conditions, with a larger response in both fluxes and concentrations to events during warmer periods and periods where the preceding discharge was low. The temperature relationship also shows seasonality indicating a potential link to the size or reactivity of watershed OM pools. The 86% of DOC lost during events represents a conservative estimate of the amount of allochthonous forested DOC transported laterally to streams. Future research on watershed cycling of DOC should take into account the importance of events in regulating the transport of DOC to downstream ecosystems, determine the relative importance of abiotic versus biotic processes for the temperature regulation of eventassociated DOC fluxes, and elucidate the interactions between processes that respond to climate on event versus longer time scales.

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Section: Discussionmentioning

confidence: 99%

Event controlled DOC export from forested watersheds

2010

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“…Generally, high concentrations during the rising limb of the hydrograph lead to clockwise hysteresis, while high concentrations during the falling limb imply counterclockwise hysteresis. Clockwise hysteretic patterns have been attributed to early flushing and depletion effects as well as changes in the connectivity of riparian or hillslope flowpaths (Hornberger et al, 1994;Boyer et al, 2000;Ågren et al, 2008;Pacific et al, 2010;McGlynn and McDonnell, 2003).…”

Section: Introductionmentioning

confidence: 99%

Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements

et al. 2013

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Concentrations of dissolved organic carbon (DOC) in runoff from catchments are often subject to substantial short-term variations. The aim of this study was to identify the compartmental sources of DOC in a forested catchment and the causes for short-term variations in runoff. Furthermore, we investigated the implication of short-term variations for the calculation of annual runoff fluxes. High frequency measurements (30 min intervals) of DOC in runoff, of discharge and groundwater table were conducted for one year in the 4.2 km2 forested Lehstenbach catchment, Germany. Riparian wetland soils represent about 30% of the catchment area. The quality of DOC was investigated by three dimensional fluorescence excitation-emission matrices in samples taken from runoff, deep groundwater and shallow groundwater from the riparian wetland soils. The concentrations of DOC in runoff were highly variable at an hourly to daily time scale, ranging from 2.6 mg L−1 to 34 mg L−1 with an annual average of 9.2 mg L−1. The concentrations were positively related to discharge, with a counter clockwise hysteresis. Relations of DOC to discharge were steeper and the degree of hysteresis larger in the summer/fall than in the winter/spring period. Dynamics of groundwater table, discharge, DOC concentrations and DOC quality parameters indicated that DOC in runoff originated mainly from the riparian wetland soils, both under low and high flow conditions. The annual export of DOC from the catchment was 84 kg C ha−1 yr−1 when calculated from the high frequency measurements. If the annual export was calculated by simulated samplings of >2 days intervals substantial deviations resulted. Predicted changes in precipitation and discharge patterns as well as generally increasing temperatures likely will cause raising DOC exports from this catchment

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“…For example, the simple mixing model of Boyer et al (2000) focuses mainly on hydrological factors controlling DOC, while the dynamic lacustrine DOC models of Hanson et al (2004) and Canham et al (2004) are useful tools for exploring hypotheses concerning DOC dynamics in lakes. The simple model of Jutras et al (2011) also represents the present-day DOC dynamics well, but is based only on topographic and hydroclimatic factors.…”

Section: Introductionmentioning

confidence: 99%

Cross-scale ensemble projections of dissolved organic carbon dynamics in boreal forest streams

et al. 2014

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Climate is an important driver of dissolved organic carbon (DOC) dynamics in boreal catchments characterized by networks of streams within forest-wetland landscape mosaics. In this paper, we assess how climate change may affect stream DOC concentrations ([DOC]) and export from boreal forest streams with a multi-model ensemble approach. First, we apply an ensemble of regional climate models (RCMs) to project soil temperatures and stream-flows. These data are then used to drive two biogeochemical models of surface water DOC: (1) The Integrated Catchment model for Carbon (INCA-C), a detailed process-based model of DOC operating at the catchment scale, and (2) The Riparian Integration Model (RIM), a simple dynamic hillslope scale model of stream [DOC]. All RCMs project a consistent increase in temperature and precipitation as well as a shift in spring runoff peaks from May to April. However, they present a considerable range of possible future runoff conditions with an ensemble median increase of 31 % between current and future (2061-2090) conditions. Both biogeochemical models perform well in describing the dynamics of presentday stream [DOC] and fluxes, but disagree in their future projections. Here, we assess possible futures in three boreal catchments representative of forest, mire and mixed landscape elements. INCA-C projects a wider range of stream [DOC] due to its temperature sensitivity, whereas RIM gives consistently larger inter-annual variation and a wider range of exports due to its sensitivity to hydrological variations. The uncertainties associated with modeling complex processes that control future DOC dynamics in boreal and temperate catchments are still the main limitation to our understanding of DOC mechanisms under changing climate conditions. Novel, currently overlooked or unknown drivers may appear that will present new challenges to modelling DOC in the future.

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Effects of asynchronous snowmelt on flushing of dissolved organic carbon: a mixing model approach

Cited by 115 publications

References 19 publications

Event controlled DOC export from forested watersheds

Event controlled DOC export from forested watersheds

Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements

Cross-scale ensemble projections of dissolved organic carbon dynamics in boreal forest streams

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