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

Giesler, Reiner; Lyon, Steve W.; Mörth, Carl‐Magnus; Karlsson, Jan; Karlsson, Elin; Jantze, Elin J.; Destouni, Georgia; Humborg, Christoph

doi:10.5194/bg-11-525-2014

Cited by 64 publications

(96 citation statements)

References 68 publications

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“…Sampling campaigns were conducted from February to August 2015, focusing on hydrology as a complement to ongoing biogeochemical cycling investigations and monitoring in the region (Giesler et al 2014;Lundin et al 2016). The campaigns focused on assessing isotopic composition and variability across the catchment inputs as snow and rain, and catchment outputs through the stream water.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Lessons learned from monitoring the stable water isotopic variability in precipitation and streamflow across a snow-dominated subarctic catchment

Lyon

Ploum

Velde³

et al. 2018

Arctic, Antarctic, and Alpine Research

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Lessons learned from monitoring the stable water isotopic variability in precipitation and streamflow across a snow-dominated subarctic catchment Arctic, Antarctic and Alpine research, 50(1): e1454778 https://doi.org/10. 1080/15230430.2018.1454778 Access to the published version may require subscription. N.B. When citing this work, cite the original published paper. This empirical study explores shifts in stable water isotopic composition for a subarctic catchment located in northern Sweden as it transitions from spring freshet to summer low flows. Relative changes in the isotopic composition of streamflow across the main catchment and fifteen nested subcatchments are characterized in relation to the isotopic composition of precipitation. With our sampling campaign, we explore the variability in stream-water isotopic composition that originates from precipitation as the input shifts from snow to rain and as landscape flow pathways change across scales. The isotopic similarity of high-elevation snowpack water and early season rainfall water seen through our sampling scheme made it difficult to truly isolate the impact of seasonal precipitation phase change on stream-water isotopic response. This highlights the need to explicitly consider the complexity of arctic and alpine landscapes when designing sampling strategies to characterize hydrological variability via stable water isotopes. Results show a potential influence of evaporation and source water mixing both spatially (variations with elevation) and temporally (variations from post-freshet to summer flows) on the composition of stream water across Miellajokka. As such, the data collected in this empirical study allow for initial conceptualization of the relative importance of, for example, hydrological connectivity within this mountainous, subarctic landscape. ARTICLE HISTORY

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Section: Sample Collection and Analysismentioning

confidence: 99%

Lessons learned from monitoring the stable water isotopic variability in precipitation and streamflow across a snow-dominated subarctic catchment

Lyon

Ploum

Velde³

et al. 2018

Arctic, Antarctic, and Alpine Research

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“…lands make up a large portion of the landscape mosaic and regional-scale differences exist in carbon fluxes (Giesler et al, 2014).…”

Section: Y Sjöberg Et Al: Geophysical Mapping Of Palsa Peatland Permentioning

confidence: 99%

Geophysical mapping of palsa peatland permafrost

et al. 2015

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Abstract. Permafrost peatlands are hydrological and biogeochemical hotspots in the discontinuous permafrost zone. Non-intrusive geophysical methods offer a possibility to map current permafrost spatial distributions in these environments. In this study, we estimate the depths to the permafrost table and base across a peatland in northern Sweden, using ground penetrating radar and electrical resistivity tomography. Seasonal thaw frost tables (at ∼ 0.5 m depth), taliks (2.1-6.7 m deep), and the permafrost base (at ∼ 16 m depth) could be detected. Higher occurrences of taliks were discovered at locations with a lower relative height of permafrost landforms, which is indicative of lower ground ice content at these locations. These results highlight the added value of combining geophysical techniques for assessing spatial distributions of permafrost within the rapidly changing sporadic permafrost zone. For example, based on a back-ofthe-envelope calculation for the site considered here, we estimated that the permafrost could thaw completely within the next 3 centuries. Thus there is a clear need to benchmark current permafrost distributions and characteristics, particularly in under studied regions of the pan-Arctic.

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“…10). The areanormalized DOC export of 1.0 ton km -2 year -1 , is comparable to that of many arctic or temperate watersheds, but less than many tropical or peatdominated watersheds (Table 1, Aitkenhead and McDowell 2000;Giesler et al 2014;Jones and Schilling 2012;Khadka et al 2014;Lopez et al 2012;Wilson et al 2013). The portion of DOC calculated to be groundwater-derived ranged from 67 % for the upper watershed to 94 % in the lower watershed, both recorded during higher flow conditions.…”

Section: Riverine Carbon Exportmentioning

confidence: 75%

Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA

et al. 2014

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To understand role of biogeochemical reactions in controlling the amount and molecular form of dissolved carbon exported from carbonate terrains, spatiotemporal variations in dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) were observed over one year in the Santa Fe River system, a period of base flow or below. A water mixing model developed using concentrations of Na ? , Cl -, and SO 4 -2 identified three major water sources: soil water, groundwater and deep aquifer water. After accounting for mixing of these water sources, additional chemical signatures resulting from biogeochemical processes in the riparian zone were identified. Net mineralization of DOC occurred throughout the Santa Fe River watershed, particularly during the lowest flow conditions and in the upper watershed. However, natural dissolved organic matter was more labile during low flow and in the lower watershed, and predominantly derived from groundwater (rather than soil water) in all samples, likely via releases during carbonate dissolution. Carbonate dissolution commonly occurred in the upper watershed during low flow conditions, while carbonate minerals precipitated during baseflow, as well as in the lower watershed during very low flow conditions. Thus, riparian zone biogeochemical processes were strongly mediated by watershed hydrology, whose spatiotemporal variations resulted in greater inorganic and organic C export production in the lower watershed than the upper watershed, and during higher flow versus lower flow periods. During this lower flow period, the Santa Fe River watershed exported *1.0 and 10.3 ton km -2 year -1 DOC and DIC, respectively, representing higher C yields than many other types of watersheds.

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

Cited by 64 publications

References 68 publications

Lessons learned from monitoring the stable water isotopic variability in precipitation and streamflow across a snow-dominated subarctic catchment

Lessons learned from monitoring the stable water isotopic variability in precipitation and streamflow across a snow-dominated subarctic catchment

Geophysical mapping of palsa peatland permafrost

Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA

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