Subsurface release and transport of dissolved carbon in a discontinuous permafrost region

Jantze, Elin J.; Lyon, Steve W.; Destouni, Georgia

doi:10.5194/hess-17-3827-2013

Cited by 27 publications

(23 citation statements)

References 59 publications

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“…Furthermore, when considering the long-term annual DOC and DIC loads, Jantze et al (2013) reported no significant trends in the total annual mass flux of either DIC or DOC over the periods considered but a significant decreasing trend in total annual discharge for stream 6. Together, this decreasing trend in discharge and increasing trend in DIC concentration can be shown to be consistent with increasing water travel times through the landscape using a mechanistic modeling approach like that outlined in Lyon et al (2010a) and Jantze et al (2013). There are no direct observations of active layer changes from upland soils in the area but it seems likely that these also are affected similar to the observations from the permafrost mires (e.g., Callaghan et al, 2010).…”

Section: The Role Of Shifting Flow Pathways For Dic and Doc Concentramentioning

confidence: 99%

“…There are a number of arguments favoring that the observed changes are related to changes in water flow pathways such as those seen in time from the long-term monitoring. For instance, recession flow analysis based on long-term flow records from stream 6 suggests that there has been an increase in the effective aquifer depth in the catchment that could be related to permafrost thaw (Lyon et al, 2009), while analyses of the annual discharges matching the period considered here show decreases in annual total discharge (Jantze et al, 2013). Furthermore, when considering the long-term annual DOC and DIC loads, Jantze et al (2013) reported no significant trends in the total annual mass flux of either DIC or DOC over the periods considered but a significant decreasing trend in total annual discharge for stream 6.…”

Section: The Role Of Shifting Flow Pathways For Dic and Doc Concentramentioning

confidence: 99%

“…For instance, recession flow analysis based on long-term flow records from stream 6 suggests that there has been an increase in the effective aquifer depth in the catchment that could be related to permafrost thaw (Lyon et al, 2009), while analyses of the annual discharges matching the period considered here show decreases in annual total discharge (Jantze et al, 2013). Furthermore, when considering the long-term annual DOC and DIC loads, Jantze et al (2013) reported no significant trends in the total annual mass flux of either DIC or DOC over the periods considered but a significant decreasing trend in total annual discharge for stream 6. Together, this decreasing trend in discharge and increasing trend in DIC concentration can be shown to be consistent with increasing water travel times through the landscape using a mechanistic modeling approach like that outlined in Lyon et al (2010a) and Jantze et al (2013).…”

Section: The Role Of Shifting Flow Pathways For Dic and Doc Concentramentioning

confidence: 99%

“…This may have profound effects not only on C losses but also on the forms of C lost (Vonk and Gustafsson, 2013). For instance, although there are indications of increased losses of DOC (Frey and Smith, 2005) from northern latitude ecosystems, changes in hydrological flow pathways may also alter the proportion between organic and dissolved inorganic carbon (DIC) export (Lyon et al, 2010a;Jantze et al, 2013). Loss of permafrost areas due to degradation Klaminder et al, 2008) or a deepening of the active layer may increase the importance of subsurface flow pathways (Striegl et al, 2005;Walvoord and Striegl, 2007;Lyon et al, 2009Lyon et al, , 2010b.…”

Section: R Giesler Et Al: Catchment-scale Dissolved Carbon Concentrmentioning

confidence: 99%

“…For stream 6 (Abiskojokka) considered in the study of Lyon et al (2010a) and Jantze et al (2013), daily stream flows for the entire hydrologic year 1 May 2008 through 30 April 2009 were measured by and available through the Swedish Meteorological and Hydrological Institute (SMHI; Gage ID 957). For the remaining sites, daily stream flow was observed from 1 May 2008 through 1 October 2008.…”

Section: R Giesler Et Al: Catchment-scale Dissolved Carbon Concentrmentioning

confidence: 99%

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Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden

et al. 2014

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Abstract. Climatic change is currently enhancing permafrost thawing and the flow of water through the landscape in subarctic and arctic catchments, with major consequences for the carbon export to aquatic ecosystems. We studied stream water carbon export in several tundra-dominated catchments in northern Sweden. There were clear seasonal differences in both dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) concentrations. The highest DOC concentrations occurred during the spring freshet while the highest DIC concentrations were always observed during winter baseflow conditions for the six catchments considered in this study. Long-term trends for the period 1982 to 2010 for one of the streams showed that DIC concentrations has increased by 9 % during the 28 yr of measurement while no clear trend was found for DOC. Similar increasing trends were also found for conductivity, Ca and Mg. When trends were discretized into individual months, we found a significant linear increase in DIC concentrations with time for September, November and December. In these subarctic catchments, the annual mass of C exported as DIC was in the same order of magnitude as DOC; the average proportion of DIC to the total dissolved C exported was 61 % for the six streams. Furthermore, there was a direct relationship between total runoff and annual dissolved carbon fluxes for these six catchments. These relationships were more prevalent for annual DIC exports than annual DOC exports in this region. Our results also highlight that both DOC and DIC can be important in highlatitude ecosystems. This is particularly relevant in environments where thawing permafrost and changes to subsurface ice due to global warming can influence stream water fluxes of C. The large proportion of stream water DIC flux also has implications on regional C budgets and needs to be considered in order to understand climate-induced feedback mechanisms across the landscape.

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Section: The Role Of Shifting Flow Pathways For Dic and Doc Concentramentioning

confidence: 99%

Section: The Role Of Shifting Flow Pathways For Dic and Doc Concentramentioning

confidence: 99%

Section: The Role Of Shifting Flow Pathways For Dic and Doc Concentramentioning

confidence: 99%

Section: R Giesler Et Al: Catchment-scale Dissolved Carbon Concentrmentioning

confidence: 99%

Section: R Giesler Et Al: Catchment-scale Dissolved Carbon Concentrmentioning

confidence: 99%

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Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden

et al. 2014

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Impact of degrading permafrost on subsurface solute transport pathways and travel times

Frampton

2015

Water Resour. Res.

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Subsurface solute transport under surface warming and degrading permafrost conditions is studied using a physically based model of coupled cryotic and hydrogeological flow processes combined with a particle tracking method. Changes in the subsurface water and inert solute pathways and travel times are analyzed for different modeled geological configurations. For all simulated cases, the minimum and mean travel times increase nonlinearly with warming irrespective of geological configuration and heterogeneity structure. The timing of the start of increase in travel time depends on heterogeneity structure, combined with the rate of permafrost degradation that also depends on material thermal and hydrogeological properties. The travel time changes depend on combined warming effects of: i) increase in pathway length due to deepening of the active layer, ii) reduced transport velocities due to a shift from horizontal saturated groundwater flow near the surface to vertical water percolation deeper into the subsurface, and iii) pathway length increase and temporary immobilization caused by cryosuction-induced seasonal freeze cycles.

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Transitions in Arctic ecosystems: Ecological implications of a changing hydrological regime

et al. 2016

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Numerous international scientific assessments and related articles have, during the last decade, described the observed and potential impacts of climate change as well as other related environmental stressors on Arctic ecosystems. There is increasing recognition that observed and projected changes in freshwater sources, fluxes, and storage will have profound implications for the physical, biogeochemical, biological, and ecological processes and properties of Arctic terrestrial and freshwater ecosystems. However, a significant level of uncertainty remains in relation to forecasting the impacts of an intensified hydrological regime and related cryospheric change on ecosystem structure and function. As the terrestrial and freshwater ecology component of the Arctic Freshwater Synthesis, we review these uncertainties and recommend enhanced coordinated circumpolar research and monitoring efforts to improve quantification and prediction of how an altered hydrological regime influences local, regional, and circumpolar-level responses in terrestrial and freshwater systems. Specifically, we evaluate (i) changes in ecosystem productivity; (ii) alterations in ecosystem-level biogeochemical cycling and chemical transport; (iii) altered landscapes, successional trajectories, and creation of new habitats; (iv) altered seasonality and phenological mismatches; and (v) gains or losses of species and associated trophic interactions. We emphasize the need for developing a process-based understanding of interecosystem interactions, along with improved predictive models. We recommend enhanced use of the catchment scale as an integrated unit of study, thereby more explicitly considering the physical, chemical, and ecological processes and fluxes across a full freshwater continuum in a geographic region and spatial range of hydroecological units (e.g., stream-pond-lake-river-near shore marine environments).

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Subsurface release and transport of dissolved carbon in a discontinuous permafrost region

Cited by 27 publications

References 59 publications

Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden

Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden

Impact of degrading permafrost on subsurface solute transport pathways and travel times

Transitions in Arctic ecosystems: Ecological implications of a changing hydrological regime

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