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Widerlund, Anders
Publications (10 of 75) Show all publications
Hellman, M., Bonilla-Rosso, G., Widerlund, A., Juhanson, J. & Hallin, S. (2019). External carbon addition for enhancing denitrification modifies bacterial community composition and affects CH4 and N2O production in sub-arctic mining pond sediments. Water Research, 158, 22-33
Open this publication in new window or tab >>External carbon addition for enhancing denitrification modifies bacterial community composition and affects CH4 and N2O production in sub-arctic mining pond sediments
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2019 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 158, p. 22-33Article in journal (Refereed) Published
Abstract [en]

Explosives used in mining operations release reactive nitrogen (N) that discharge into surrounding waters. Existing pond systems at mine sites could be used for N removal through denitrification and we investigated capacity in tailings and clarification pond sediments at an iron-ore mine site. Despite differences in microbial community structure in the two ponds, the potential denitrification rates were similar, although carbon limited. Therefore, a microcosm experiment in which we amended sediment from the clarification pond with acetate, cellulose or green algae as possible carbon sources was conducted during 10 weeks under denitrifying conditions. Algae and acetate treatments showed efficient nitrate removal and increased potential denitrification rates, whereas cellulose was not different from the control. Denitrifiers were overall more abundant than bacteria performing dissimilatory nitrate reduction to ammonium (DNRA) or anaerobic ammonium oxidation, although DNRA bacteria increased in the algae treatment and this coincided with accumulation of ammonium. The algae addition also caused higher emissions of methane (CH4) and nitrous oxide (N2O). The bacterial community in this treatment had a large proportion of Bacteroidia, sulfate reducing taxa and bacteria known as fermenters. Functional gene abundances indicated an imbalance between organisms that produce N2O in relation to those that can reduce it, with the algae treatment showing the lowest relative capacity for N2O reduction. These findings show that pond sediments have the potential to contribute to mitigating nitrate levels in water from mining industry, but it is important to consider the type of carbon supply as it affects the community composition, which in turn can lead to uwanted processes and increased greenhouse gas emissions.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Algae, Clarification pond, Greenhouse gases, Nitrate removal, Tailings pond, Water treatment
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-73689 (URN)10.1016/j.watres.2019.04.007 (DOI)000470047700003 ()31009831 (PubMedID)2-s2.0-85064467376 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-05-03 (johcin)

Available from: 2019-04-17 Created: 2019-04-17 Last updated: 2019-06-20Bibliographically approved
Nilsson, L. & Widerlund, A. (2018). Modelling tool for predicting and simulating nitrogen concentrations in cold-climate mining ponds. Ecological Modelling, 380, 40-52
Open this publication in new window or tab >>Modelling tool for predicting and simulating nitrogen concentrations in cold-climate mining ponds
2018 (English)In: Ecological Modelling, ISSN 0304-3800, E-ISSN 1872-7026, Vol. 380, p. 40-52Article in journal (Refereed) Published
Abstract [en]

A nitrogen model was developed with the aim to trace nitrogen cycling in a cold climate-mining pond at the Aitik copper mine in northern Sweden. The model contains 10 state variables and 19 nitrogen cycling reactions. The model also includes sediment and physical properties of the pond, such as evaporation, freezing and thawing. The model was written in Mathworks MATLAB and was calibrated and validated using environmental monitoring data for the clarification pond at the Aitik mine. The data used comprised monthly values of nitrogen speciation, phosphorous and water flow. The model accurately predicts ammonium (r2 = 0.84) and nitrate (r2 = 0.82) concentrations in a time series from February 2012–August 2014. The model did not accurately predict nitrate concentrations (r2 = 0.11), presumably due to high oxygen concentration in the pond water that prevented denitrification in the water column. The transport of organic material to the sediment was also limiting denitrification in the sediment. When allowing denitrification in the water column as well as increasing the rate of transport of organic material to the sediment the nitrate prediction capacity increased to a satisfactory level (r2 = 0.54). A sensitivity analysis for the system showed that the most sensitive reactions for the water column were oxic mineralisation as well as the nitrification rate.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-68688 (URN)10.1016/j.ecolmodel.2018.04.006 (DOI)000434750500005 ()2-s2.0-85046670027 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-05-09 (andbra)

Available from: 2018-05-09 Created: 2018-05-09 Last updated: 2018-10-25Bibliographically approved
Suteerasak, T., Elming, S.-Å., Possnert, G., Ingri, J. & Widerlund, A. (2017). Deposition rates and 14C apparent ages of Holocene sediments in the Bothnian Bay of the Gulf of Bothnia using paleomagnetic dating as a reference. Marine Geology, 383, 1-13
Open this publication in new window or tab >>Deposition rates and 14C apparent ages of Holocene sediments in the Bothnian Bay of the Gulf of Bothnia using paleomagnetic dating as a reference
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2017 (English)In: Marine Geology, ISSN 0025-3227, E-ISSN 1872-6151, Vol. 383, p. 1-13Article in journal (Refereed) Published
Abstract [en]

Three 6-m-long cores of sediments were collected in the northern, middle and southern part of the Bothnian Bay. The sediments were dated by paleomagnetic dating techniques, constrained by magnetic properties and geochemical data. The results indicate the ages of the sediments in the bottom part of the cores in the northern, middle and southern parts of the Bothnian Bay to be approximately 5300 years BP, 5350 years BP and 3500 years BP, respectively. The deposition rate calculated from the estimated ages at various depths show that the deposition rate was generally in the range 0.5–1.5 mm/year but it was higher in the southern part than in the middle and northern parts of the bay. There was a significant increase in the deposition rate at ca 2200 years BP, recorded in all three cores, a rate varying between 2.47 and 3.07 mm/year and lasting until ca 1840 years BP. A proposed constant uplift rate of the crust during the period ca 5500 years BP to present is thus not reflected by a constant deposition rate. The peaks in deposition rates at ca 2200–1840 years BP were followed by a decrease in salinity. This phenomenon is suggested to be caused by crustal uplift, with a threshold being formed in the southern part of the bay, thereby increasing the reactivation of bottom sediments and reducing the inflow of brackish water from the Bothnian Sea. The14C ages of the sediments reveal differences in age compared with the paleomagnetic ages. In the southern core, the 14C ages are ca 1350 years older, and in the north, the age offset is mixed. The reactivation and re-deposition of sediments is argued to be the reason for the apparent 14C age differences. This finding demonstrates that 14C cannot be used for the dating of Bothnian Bay sediments unless the radiocarbon age offset has been determined.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Geophysics Geochemistry
Research subject
Exploration Geophysics; Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-60431 (URN)10.1016/j.margeo.2016.10.009 (DOI)000392786800001 ()2-s2.0-84996865906 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-12-01 (kribac)

Available from: 2016-11-15 Created: 2016-11-15 Last updated: 2018-09-13Bibliographically approved
Nilsson, L. & Widerlund, A. (2017). Tracing nitrogen cycling in mining waters using stable nitrogen isotope analysis. Applied Geochemistry, 84, 41-51
Open this publication in new window or tab >>Tracing nitrogen cycling in mining waters using stable nitrogen isotope analysis
2017 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 84, p. 41-51Article in journal (Refereed) Published
Abstract [en]

We show how we used stable nitrogen and oxygen isotopes in ammonium and nitrate to identify and quantify nitrogen transformation and nitrogen sources at the LKAB mining site in northern Sweden. Stable nitrogen isotope analysis worked as an excellent tool for tracing nitrogen cycling in rapidly moving process waters. The isotope analysis was performed on the mining process waters at seven different key points along the water flow and we identified nitrification, ammonia volatilisation, and ammonium adsorption as nitrogen transformation processes. The source of nitrogen is historically explained as undetonated ammonium-nitrate based explosives. We used nitrate nitrogen and oxygen isotopes to quantify four nitrogen sources in the accumulated water in the mine as well as three sources in an above ground process water reservoir. The nitrate isotope data showed that most of the nitrate (70–80%) in the accumulated water underground originated from a sampling point located close to the surface and only a minor fraction (5–20%) originated directly from undetonated explosives (direct dissolution of NH4NO3 and nitrification of NH4). Nitrate from natural groundwater formed roughly 12% of mine water nitrate. In the above ground process water reservoir isotope data indicated another source of nitrogen coming from undetonated explosives.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-63724 (URN)10.1016/j.apgeochem.2017.05.025 (DOI)000410673400004 ()2-s2.0-85020263429 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-06-14 (rokbeg)

Available from: 2017-06-05 Created: 2017-06-05 Last updated: 2018-10-25Bibliographically approved
Chlot, S., Widerlund, A. & Öhlander, B. (2015). Nitrogen uptake and cycling in Phragmites australis in a lake-receiving nutrient-rich mine water: a 15 N tracer study (ed.). Paper presented at . Environmental Earth Sciences, 74(7), 6027-6038
Open this publication in new window or tab >>Nitrogen uptake and cycling in Phragmites australis in a lake-receiving nutrient-rich mine water: a 15 N tracer study
2015 (English)In: Environmental Earth Sciences, ISSN 1866-6280, E-ISSN 1866-6299, Vol. 74, no 7, p. 6027-6038Article in journal (Refereed) Published
Abstract [en]

Uptake and cycling of nitrogen (N) in the littoral zone of a lake-receiving nutrient-rich mine water located in Boliden, northern Sweden, was investigated. Stable isotope tracer solutions of 15N as NH4 + (NAM mesocosm) or NO3 − (NOX mesocosm) were added to mesocosms enclosing plants of common reed (Phragmites australis). The 15N abundance in various plant parts was measured at pre-defined time intervals over an experimental period of 22 days. During the course of the experiment, plant parts from the NAM mesocosms were significantly more enriched in 15N than plant parts from the NOX mesocosms. On day 13, Δδ15N values of the fine roots from the NAM mesocosms had reached +8220 ‰, while the maximum Δδ15N value in NOX roots was considerably lower at +4430 ‰. Using 15N values in macrophyte tissues present at the end of the experiment enabled calculations of uptake rates and % of tracer N recovered in the plant (%tracerNrecov). Maximum tracer uptake rates were higher for the NAM mesocosms (1.4 µg g−1 min−1 or 48 mg N m−2 d−1) compared to the NOX mesocosms (0.23 µg g−1 min−1 or 8.5 mg N m−2 d−1). Calculations of %tracerNrecov indicated that 1–8 and 25–44 % of added N was assimilated by plants in the NOX and NAM mesocosms, respectively. Hence, P. australis was more effective in assimilating NH4 +, and a larger portion of the tracer N accumulated in the roots compared to the other plant parts. Consequently, macrophyte N removal is most effective for cold-climate aquatic systems receiving mine water dominated by NH4 +. For permanent removal of N, the whole plant (including the roots) should be harvested.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-10862 (URN)10.1007/s12665-015-4626-x (DOI)000362016100046 ()2-s2.0-84941181251 (Scopus ID)9bc7a66e-8365-4d40-9919-24931086f974 (Local ID)9bc7a66e-8365-4d40-9919-24931086f974 (Archive number)9bc7a66e-8365-4d40-9919-24931086f974 (OAI)
Note
Validerad; 2015; Nivå 2; 20150625 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ingri, J., Widerlund, A., Suteerasak, T., Bauer, S. & Elming, S.-å. (2014). Changes in trace metal sedimentation during freshening of a coastal basin (ed.). Paper presented at . Marine Chemistry, 167, 2-12
Open this publication in new window or tab >>Changes in trace metal sedimentation during freshening of a coastal basin
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2014 (English)In: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 167, p. 2-12Article in journal (Refereed) Published
Abstract [en]

Holocene freshening has turned the Bothnian Bay, northern Baltic Sea into an oligotrophic basin. Sequestering of trace elements has changed significantly during the oligotrophication process. In principle, trace metals have been transferred from permanently buried sulfides to Fe–Mn-oxyhydroxides in the top layers of the sediment. The oxyhydroxide layers restrict the flux of trace metals from the sediment to the oxic bottom water. Hence, Fe–Mn cycling in the suboxic sediment enriches a number of trace metals in the surface sediment. Arsenic, Sn, Ge and Bi show enrichment in the Fe-oxyhydroxide layer, whereas Mo, Cd, Ni, Co, Cu, and Sb are enriched in the uppermost Mn-oxyhydroxide layer. This natural redox cycling in the sediment obscures pollution effects.The oligotrophication process started approximately 3500 years ago, reflected in decreasing deposition of Zn, a proxy for phytoplankton production, and formation of Mn oxyhydroxide layers. Similarly, Ba/Al data indicate a decrease in the pelagic input of plankton. Barium data also suggest that dissolved sulfide in the sediment never reached high concentrations. Germanium is closely related to Ba, suggesting that Ge can be used as a proxy for phytoplankton production. Vanadium, U, Re, and Mo all indicate that the bottom water never has been significantly sulfidic during the last 5500 years. Rhenium data indicate that the organic carbon oxidation rate has decreased during the last 5500 years. Cadmium follows the organic matter distribution, but started to increase 1000 YBP (years before present). The reason for this enhanced input of Cd is unclear.

Keywords
Earth sciences - Exogenous eart sciences, Geovetenskap - Exogen geovetenskap
National Category
Geochemistry Geophysics
Research subject
Applied Geology; Exploration Geophysics
Identifiers
urn:nbn:se:ltu:diva-5774 (URN)10.1016/j.marchem.2014.06.010 (DOI)000345805700002 ()2-s2.0-84910049803 (Scopus ID)3f465607-16e1-43ab-b560-6484e509aba7 (Local ID)3f465607-16e1-43ab-b560-6484e509aba7 (Archive number)3f465607-16e1-43ab-b560-6484e509aba7 (OAI)
Note
Validerad; 2014; 20140812 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Siergieiev, D., Widerlund, A., Ingri, J., Lundberg, A. & Öhlander, B. (2014). Flow regulation effects on the hydrogeochemistry of the hyporheic zone in boreal rivers (ed.). Paper presented at . Science of the Total Environment, 499, 424-436
Open this publication in new window or tab >>Flow regulation effects on the hydrogeochemistry of the hyporheic zone in boreal rivers
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2014 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 499, p. 424-436Article in journal (Refereed) Published
Abstract [en]

River-aquifer interfaces are essential for ecosystem functioning in terms of nutrient exchange and biological habitat, but are greatly threatened world-wide. This study examined geochemical aspects of river-aquifer interaction in one regulated and one unregulated boreal river in Northern Sweden to determine whether the geochemical functioning of the hyporheic zone is affected by hydrological alterations, e.g. regulated river discharge and river-aquifer connectivity. In the unregulated Kalix River, the hyporheic pore water was well-oxygenated with orthogonal fluxes (≈0.6-0.7 m d-1) and acted as a sink for Fe, Mn, Al, NH4, and Ca, with fractional losses of 95%, 92%, 45%, 31%, and 15%, respectively. A corresponding elevation in the concentrations of these elements in the hyporheic sediment was observed, with higher saturation indices of Fe-, Mn-, and Al-bearing secondary minerals in hyporheic waters. In the regulated Lule River, hydraulic connectivity at the river-aquifer interface was altered by the presence of a clogging layer (0.04 m d–1). In addition, the river discharge oscillated daily, severely reducing exchange flows across the riverbed (<0.01 m d-1). As a result, the hyporheic pore water was suboxic, with elevated concentrations of filtered Fe and Mn (fractional increase of ≈3700% and ≈2500%, respectively) and other solutes (NH4, Si, S, Ca). A conceptual model revealed functional differences between geochemical features of the hyporheic zone of regulated and unregulated rivers. Overall, the results showed that hyporheic processes are altered along regulated rivers, with resulting impacts on the geochemistry of riverine, riparian and related marine ecosystems.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-11343 (URN)10.1016/j.scitotenv.2014.06.112 (DOI)000343613200045 ()25022722 (PubMedID)2-s2.0-84921724312 (Scopus ID)a4aafd39-c324-465e-9b6d-7e25ce8a3dfc (Local ID)a4aafd39-c324-465e-9b6d-7e25ce8a3dfc (Archive number)a4aafd39-c324-465e-9b6d-7e25ce8a3dfc (OAI)
Note
Validerad; 2014; 20140701 (dmysie)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Siergieiev, D., Lundberg, A. & Widerlund, A. (2014). Hyporheic water exchange in a large hydropower regulated boreal river: directions and rates (ed.). Paper presented at . Hydrology Research, 45(3), 334-348
Open this publication in new window or tab >>Hyporheic water exchange in a large hydropower regulated boreal river: directions and rates
2014 (English)In: Hydrology Research, ISSN 1998-9563, Vol. 45, no 3, p. 334-348Article in journal (Refereed) Published
Abstract [en]

Widespread river regulation is known to modify river-aquifer interactions, influencing entire watersheds, but knowledge of the hyporheic flowpath along regulated rivers is limited. This study measured the hydraulic conductivity of the river bed and the aquifer, water levels and seepage fluxes in the heavily regulated Lule River in Northern Sweden, with the aim of characterising water exchange across the river-aquifer interface. While pristine rivers in the area are gaining, the Lule River was recharging the aquifer during 10% of the time. Daily river level fluctuations (typically ±0.25 m) directed ~3% of the total orthogonal flux across the river bed towards the aquifer, while during ~2% of the time the orthogonal fluxes were negligible (≤10–4 m d–1). A clogging layer on the river bed, most likely formed due to the modified river discharge, restricted river-aquifer exchange. The hyporheic zone had higher electrical conductivity than the river and the aquifer and electrical conductivity occasionally decreased following rising river water levels, with 3–5 hours delay. Overall, hydropower regulation has severely altered the hydrological regime of the hyporheic zone in the Lule River.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-13258 (URN)10.2166/nh.2013.011 (DOI)000338913600004 ()2-s2.0-84906216277 (Scopus ID)c73b5337-89c0-4af3-b7b5-2cb5cc78f1dd (Local ID)c73b5337-89c0-4af3-b7b5-2cb5cc78f1dd (Archive number)c73b5337-89c0-4af3-b7b5-2cb5cc78f1dd (OAI)
Note
Validerad; 2014; 20130706 (dmysie)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Siergieiev, D., Widerlund, A., Lundberg, A., Drugge, L., Collomp, M., Ingri, J. & Öhlander, B. (2014). Impact of Hydropower Regulation on River Water Composition in Northern Sweden (ed.). Paper presented at . Aquatic geochemistry, 20(1), 59-80
Open this publication in new window or tab >>Impact of Hydropower Regulation on River Water Composition in Northern Sweden
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2014 (English)In: Aquatic geochemistry, ISSN 1380-6165, E-ISSN 1573-1421, Vol. 20, no 1, p. 59-80Article in journal (Refereed) Published
Abstract [en]

Using hydrogeochemical analysis of two large boreal rivers (pristine Kalix and hydropower regulated Lule) discharging into the Gulf of Bothnia, the major impacts of regulation on water discharge, element transport, and their seasonal redistribution have been assessed. The pre-regulation hydrogeochemical features were assumed to be similar for the two rivers. For the Lule River, the average maximum runoff was almost halved, while the average minimum was tripled as a result of the regulation. The fraction of winter transport of total organic carbon (TOC), Fe, Si, suspended Mn and P in the Lule River was, according to a conservative estimate, two to three times higher than in the pristine river. Longer residence time in the Lule River delayed arrival of the suspended Mn peak and dissolved Si decline to the river mouth. During summer, the suspended C/N ratio in the regulated river was 10-20 compared to <10 for the pristine, suggesting presence of predominantly old organic material. This was supported by a virtually constant suspended P/Fe ratio throughout the year in the Lule River, indicating low abundance of phytoplankton. TOC varied irregularly in the Lule River suggesting temporal disconnection between the river and the upper riparian zone. The disappearance of the spring flow maximum, a shift of element transport from spring to winter, and supply of mainly old organic material during the vegetation growth season may have a pronounced impact on the ecosystem of the Gulf of Bothnia and the river itself.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-6401 (URN)10.1007/s10498-013-9215-6 (DOI)000330974700004 ()2-s2.0-84893752154 (Scopus ID)4a0ccc97-fce7-45d3-b568-98f31d8af904 (Local ID)4a0ccc97-fce7-45d3-b568-98f31d8af904 (Archive number)4a0ccc97-fce7-45d3-b568-98f31d8af904 (OAI)
Projects
Groundwater and Dependent Ecosystems: New Scientific and Technological Basis for Assessing Climate Change and Land-use Impacts on Groundwater
Note
Validerad; 2014; 20131031 (dmysie)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Öhlander, B., Land, M., Ingri, J. & Widerlund, A. (2014). Mobility and transport of Nd isotopes in the Vadose zone during weathering of granitic till in a boreal forest (ed.). Paper presented at . Aquatic geochemistry, 20(1), 1-17
Open this publication in new window or tab >>Mobility and transport of Nd isotopes in the Vadose zone during weathering of granitic till in a boreal forest
2014 (English)In: Aquatic geochemistry, ISSN 1380-6165, E-ISSN 1573-1421, Vol. 20, no 1, p. 1-17Article in journal (Refereed) Published
Abstract [en]

There is a broad correlation between the εNd values for rivers (including both the water and the particulate material it carries) and the age of the source terrain. This paper presents Nd isotope distribution data for soil, soil water, groundwater, and stream water samples gathered in a small catchment in northern Sweden. The results show that the release of Nd and Sm from boreal forests into streams and, eventually, into the oceans is more complicated than previously realized. The weathering of till causes changes in both the Nd isotopic composition and Sm/Nd ratios. Both the Sm/Nd ratio and εNd were higher in strongly weathered soils horizons than in less weathered till, since minerals with high Sm/Nd ratios were, on average, more resistant to weathering than those with low Sm/Nd ratios. In contrast to the situation for the main minerals and the major elements, the weathering of rare earth elements (REE) was not restricted to the E-horizon: the measured REE concentrations continued to increase with depth in the C-horizon. In addition, REE released by weathering in the upper parts of the soil profile were partly secondarily retained at deeper levels. Therefore, the dissolved Nd released by weathering in the upper soil horizons was trapped and did not enter the groundwater directly. Rather, the Nd in the groundwater largely originated from weathering within the groundwater zone. However, this was not the only source of Nd in the stream water. The Nd isotope composition and Sm/Nd ratio were determined by the mixing between of Nd and Sm in the groundwater and REE-carrying organic material washed out of the soil profile. The groundwater close to the stream reaches the upper soil horizons during high discharge events such as snowmelts, and organic matter carrying Nd and Sm is washed out of the soils and thus released into the stream. Therefore, the Nd exported from catchment is derived from both the weathering within the groundwater zone, and the organic matter washed out from the soil. If longer timescales with more advanced weathering stages in the groundwater zone are considered, it cannot be ruled out that there will be a shift towards more radiogenic values in the exported Nd. Recorded shifts in the Nd isotopic composition in the ocean may thus not only reflect changed source regions, but also the weathering history of the same source region

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-7787 (URN)10.1007/s10498-013-9203-x (DOI)000330974700001 ()2-s2.0-84893734440 (Scopus ID)635df114-5f58-49cb-bc02-faba88f8d9a4 (Local ID)635df114-5f58-49cb-bc02-faba88f8d9a4 (Archive number)635df114-5f58-49cb-bc02-faba88f8d9a4 (OAI)
Note
Validerad; 2014; 20130916 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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