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

Identifying the Transport Pathways of Dissolved Organic Carbon in Contrasting Catchments

“…gave a first indication of the transport mechanisms of DOC present in our catchments. The peak in DOC concentrations observed during peak discharge events in our four catchments is in agreement with what was reported earlier by other researchers (McDowell and Likens, 1988;Hagedorn et al, 2000;Dawson et al, 2002;Kaiser and Guggenberger, 2005;Shanley et al, 2011;Halliday et al, 2012), e.g., rises in DOC concentrations during discharge events up to 350% (Hagedorn et al, 2000) or 450% (Boyer et al, 2000). he accompanying peak in SUVA during a rainfall event, indicating that the increase in DOC goes along with a change in the composition of the organic matter and also reported by Hagedorn et al (2000), gives an indication of the transport mechanisms present in the catchments.…”

Identifying the Transport Pathways of Dissolved Organic Carbon in Contrasting Catchments

“…gave a first indication of the transport mechanisms of DOC present in our catchments. The peak in DOC concentrations observed during peak discharge events in our four catchments is in agreement with what was reported earlier by other researchers (McDowell and Likens, 1988;Hagedorn et al, 2000;Dawson et al, 2002;Kaiser and Guggenberger, 2005;Shanley et al, 2011;Halliday et al, 2012), e.g., rises in DOC concentrations during discharge events up to 350% (Hagedorn et al, 2000) or 450% (Boyer et al, 2000). he accompanying peak in SUVA during a rainfall event, indicating that the increase in DOC goes along with a change in the composition of the organic matter and also reported by Hagedorn et al (2000), gives an indication of the transport mechanisms present in the catchments.…”

Role of Lakes, Flood, and Low Flow Events in Modifying Catchment‐Scale DOC:TN:TP Stoichiometry and Export

“…So far no clear changes in long‐term DOC exports in our catchments have been detected (Wu et al., 2023). The highest fluxes of DOC, TN and TP from our study catchments occurred in spring, during snowmelt, which is similar to other studies reporting the highest share of annual export of TN and DOC during snowmelt, in response to infiltrating meltwater (Boyer et al., 2000; Sebestyen et al., 2009). Similarly, previous studies have shown that export fluxes of DOC, TP and TN change across seasons (Clair et al., 2008; Corriveau et al., 2013; Rattan et al., 2017).…”

“…Consistent with observations in other biomes, the concentrations and ratios of stream water DOC, TN, and TP, exhibit seasonal fluctuations (Bernal et al, 2005;Sebestyen et al, 2009;Shousha et al, 2021). Spring floods were associated with marked decreases in DOC:TN (Figure S8 in Supporting Information S1), as would be expected from infiltration of meltwater flushing N from the soils (Boyer et al, 2000;Crossman et al, 2016). While in northern regions the presence of snowmelt typically contributes to increased DOC in streams (Laudon et al, 2011), our catchment primarily comprised of bedrock, likely resulted in lower in-stream concentrations of DOC during snowmelt.…”

“…Similarly, previous studies have shown that export fluxes of DOC, TP and TN change across seasons (Clair et al, 2008;Corriveau et al, Rattan et al, 2017). Although the export of DOC, and TN and TP changed with discharge (Boyer et al, 2000;Butturini et al, 2006;Fasching et al, 2016), our study is the first to show that the ratios of DOC:TN:TP also varied, likely due to the biological and chemical factors described above, with potential consequences for biogeochemical processing and downstream transport of solutes.…”

First Dynamic Model of Dissolved Organic Carbon Derived Directly from High-Frequency Observations through Contiguous Storms

“…This finding is consistent with the observation that DOC CONC within mobile pore waters at Brianne is greater in the near-surface strata of the podzolic soils compared with deeper strata . In addition, many conceptual models of DOC transport to streams (e.g., Boyer et al, Futter et al) need to route a significant proportion of DOC via a shallow water path to simulate stream DOC CONC consistent with observations. Examining the time constants shows that the rate of exhaustion of the fast component of the DOC LOAD (eq ) is for the most part comparable to the rate of drainage of the fast water flow.…”

Identifying the Transport Pathways of Dissolved Organic Carbon in Contrasting Catchments

“…gave a first indication of the transport mechanisms of DOC present in our catchments. The peak in DOC concentrations observed during peak discharge events in our four catchments is in agreement with what was reported earlier by other researchers (McDowell and Likens, 1988;Hagedorn et al, 2000;Dawson et al, 2002;Kaiser and Guggenberger, 2005;Shanley et al, 2011;Halliday et al, 2012), e.g., rises in DOC concentrations during discharge events up to 350% (Hagedorn et al, 2000) or 450% (Boyer et al, 2000). he accompanying peak in SUVA during a rainfall event, indicating that the increase in DOC goes along with a change in the composition of the organic matter and also reported by Hagedorn et al (2000), gives an indication of the transport mechanisms present in the catchments.…”

Role of Lakes, Flood, and Low Flow Events in Modifying Catchment‐Scale DOC:TN:TP Stoichiometry and Export

“…So far no clear changes in long‐term DOC exports in our catchments have been detected (Wu et al., 2023). The highest fluxes of DOC, TN and TP from our study catchments occurred in spring, during snowmelt, which is similar to other studies reporting the highest share of annual export of TN and DOC during snowmelt, in response to infiltrating meltwater (Boyer et al., 2000; Sebestyen et al., 2009). Similarly, previous studies have shown that export fluxes of DOC, TP and TN change across seasons (Clair et al., 2008; Corriveau et al., 2013; Rattan et al., 2017).…”

“…Consistent with observations in other biomes, the concentrations and ratios of stream water DOC, TN, and TP, exhibit seasonal fluctuations (Bernal et al, 2005;Sebestyen et al, 2009;Shousha et al, 2021). Spring floods were associated with marked decreases in DOC:TN (Figure S8 in Supporting Information S1), as would be expected from infiltration of meltwater flushing N from the soils (Boyer et al, 2000;Crossman et al, 2016). While in northern regions the presence of snowmelt typically contributes to increased DOC in streams (Laudon et al, 2011), our catchment primarily comprised of bedrock, likely resulted in lower in-stream concentrations of DOC during snowmelt.…”

“…Similarly, previous studies have shown that export fluxes of DOC, TP and TN change across seasons (Clair et al, 2008;Corriveau et al, Rattan et al, 2017). Although the export of DOC, and TN and TP changed with discharge (Boyer et al, 2000;Butturini et al, 2006;Fasching et al, 2016), our study is the first to show that the ratios of DOC:TN:TP also varied, likely due to the biological and chemical factors described above, with potential consequences for biogeochemical processing and downstream transport of solutes.…”

First Dynamic Model of Dissolved Organic Carbon Derived Directly from High-Frequency Observations through Contiguous Storms

“…This finding is consistent with the observation that DOC CONC within mobile pore waters at Brianne is greater in the near-surface strata of the podzolic soils compared with deeper strata . In addition, many conceptual models of DOC transport to streams (e.g., Boyer et al, Futter et al) need to route a significant proportion of DOC via a shallow water path to simulate stream DOC CONC consistent with observations. Examining the time constants shows that the rate of exhaustion of the fast component of the DOC LOAD (eq ) is for the most part comparable to the rate of drainage of the fast water flow.…”

Identifying the Transport Pathways of Dissolved Organic Carbon in Contrasting Catchments

“…gave a first indication of the transport mechanisms of DOC present in our catchments. The peak in DOC concentrations observed during peak discharge events in our four catchments is in agreement with what was reported earlier by other researchers (McDowell and Likens, 1988;Hagedorn et al, 2000;Dawson et al, 2002;Kaiser and Guggenberger, 2005;Shanley et al, 2011;Halliday et al, 2012), e.g., rises in DOC concentrations during discharge events up to 350% (Hagedorn et al, 2000) or 450% (Boyer et al, 2000). he accompanying peak in SUVA during a rainfall event, indicating that the increase in DOC goes along with a change in the composition of the organic matter and also reported by Hagedorn et al (2000), gives an indication of the transport mechanisms present in the catchments.…”

Role of Lakes, Flood, and Low Flow Events in Modifying Catchment‐Scale DOC:TN:TP Stoichiometry and Export

“…So far no clear changes in long‐term DOC exports in our catchments have been detected (Wu et al., 2023). The highest fluxes of DOC, TN and TP from our study catchments occurred in spring, during snowmelt, which is similar to other studies reporting the highest share of annual export of TN and DOC during snowmelt, in response to infiltrating meltwater (Boyer et al., 2000; Sebestyen et al., 2009). Similarly, previous studies have shown that export fluxes of DOC, TP and TN change across seasons (Clair et al., 2008; Corriveau et al., 2013; Rattan et al., 2017).…”

“…Consistent with observations in other biomes, the concentrations and ratios of stream water DOC, TN, and TP, exhibit seasonal fluctuations (Bernal et al, 2005;Sebestyen et al, 2009;Shousha et al, 2021). Spring floods were associated with marked decreases in DOC:TN (Figure S8 in Supporting Information S1), as would be expected from infiltration of meltwater flushing N from the soils (Boyer et al, 2000;Crossman et al, 2016). While in northern regions the presence of snowmelt typically contributes to increased DOC in streams (Laudon et al, 2011), our catchment primarily comprised of bedrock, likely resulted in lower in-stream concentrations of DOC during snowmelt.…”

“…Similarly, previous studies have shown that export fluxes of DOC, TP and TN change across seasons (Clair et al, 2008;Corriveau et al, Rattan et al, 2017). Although the export of DOC, and TN and TP changed with discharge (Boyer et al, 2000;Butturini et al, 2006;Fasching et al, 2016), our study is the first to show that the ratios of DOC:TN:TP also varied, likely due to the biological and chemical factors described above, with potential consequences for biogeochemical processing and downstream transport of solutes.…”

First Dynamic Model of Dissolved Organic Carbon Derived Directly from High-Frequency Observations through Contiguous Storms

“…This finding is consistent with the observation that DOC CONC within mobile pore waters at Brianne is greater in the near-surface strata of the podzolic soils compared with deeper strata . In addition, many conceptual models of DOC transport to streams (e.g., Boyer et al, Futter et al) need to route a significant proportion of DOC via a shallow water path to simulate stream DOC CONC consistent with observations. Examining the time constants shows that the rate of exhaustion of the fast component of the DOC LOAD (eq ) is for the most part comparable to the rate of drainage of the fast water flow.…”