liu.seSök publikationer i DiVA
Ändra sökning
Avgränsa sökresultatet
1 - 16 av 16
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Mayr, Magdalena J.
    et al.
    Univ Vienna, Austria.
    Besemer, Katharina
    WasserCluster Lunz, Austria.
    Sieczko, Anna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Univ Vienna, Austria.
    Demeter, Katalin
    Univ Vienna, Austria.
    Peduzzi, Peter
    Univ Vienna, Austria.
    Bacterial community composition and function along spatiotemporal connectivity gradients in the Danube floodplain (Vienna, Austria)2020Ingår i: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 82, nr 2, artikel-id 28Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is well recognized that river-floodplain systems contribute significantly to riverine ecosystem metabolism, and that bacteria are key players in the aquatic organic carbon cycle, but surprisingly few studies have linked bacterial community composition (BCC), function and carbon quality in these hydrologically highly dynamic habitats. We investigated aquatic BCC and extracellular enzymatic activity (EEA) related to dissolved organic carbon quality and algae composition, including the impact of a major flood event in one of the last remaining European semi-natural floodplain-systems. We found that surface connectivity of floodplain pools homogenizes BCC and EEA, whereas low connectivity led to increased BCC and EEA heterogeneity, supported by their relationship to electrical conductivity, an excellent indicator for surface connection strength. Hydrogeochemical parameters best explained variation of both BCC and EEA, while the algal community and chromophoric DOM properties explained only minor fractions of BCC variation. We conclude that intermittent surface connectivity and especially permanent isolation of floodplain pools from the main river channel may severely alter BCC and EEA, with potential consequences for nutrient cycling, ecological services and greenhouse gas emissions. Disentangling microbial structure-function coupling is therefore crucial, if we are to understand and predict the consequences of human alterations on these dynamic systems.

    Ladda ner fulltext (pdf)
    fulltext
  • 2.
    Pajala, Gustav
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tema, Tema Miljöförändring.
    Gålfalk, Magnus
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Melack, John Michael
    University of California, Santa Barbara, CA, United States.
    Macintyre, Sally
    University of California, Santa Barbara, CA, United States.
    Karlsson, Jan
    Umeå University, Umeå, Sweden.
    Sawakuchi, Henrique Oliveira
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ekologisk och miljövetenskaplig modellering. Linköpings universitet, Tekniska fakulteten.
    Sundgren, Ingrid
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nguyen, Thanh Duc
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Source data for ” Higher apparent gas transfer velocities for CO2 compared to CH4 in small lakes”2023Dataset
    Ladda ner fulltext (xlsx)
    dataset
  • 3.
    Pajala, Gustav
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Gålfalk, Magnus
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Melack, John Michael
    Univ Calif Santa Barbara, CA 93117 USA; Univ Calif Santa Barbara, CA 93106 USA.
    Macintyre, Sally
    Univ Calif Santa Barbara, CA 93117 USA; Univ Calif Santa Barbara, CA 93106 USA; Univ Calif Santa Barbara, CA 93117 USA.
    Karlsson, Jan
    Umea Univ, Sweden.
    Sawakuchi, Henrique
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sundgren, Ingrid
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nguyen, Thanh Duc
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Higher Apparent Gas Transfer Velocities for CO2 Compared to CH4 in Small Lakes2023Ingår i: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 57, nr 23, s. 8578-8587Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Highergas transfer velocities for CO2 than CH4 inlakes challenge previous results and commonly made assumptionsand highlight the importance of gas-specific transport in aquaticgreenhouse gas exchange. Large greenhousegas emissions occur via the release of carbondioxide (CO2) and methane (CH4) from the surfacelayer of lakes. Such emissions are modeled from the air-watergas concentration gradient and the gas transfer velocity (k). The links between k and the physicalproperties of the gas and water have led to the development of methodsto convert k between gases through Schmidt numbernormalization. However, recent observations have found that such normalizationof apparent k estimates from field measurements canyield different results for CH4 and CO2. Weestimated k for CO2 and CH4 from measurements of concentration gradients and fluxes in fourcontrasting lakes and found consistently higher (on an average 1.7times) normalized apparent k values for CO2 than CH4. From these results, we infer that several gas-specificfactors, including chemical and biological processes within the watersurface microlayer, can influence apparent k estimates.We highlight the importance of accurately measuring relevant air-watergas concentration gradients and considering gas-specific processeswhen estimating k.

    Ladda ner fulltext (pdf)
    fulltext
  • 4.
    Pajala, Gustav
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique Oliveira
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tema, Tema Miljöförändring.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Seekell, David
    Sundgren, Ingrid
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nguyen, Thanh Duc
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Tekniska fakulteten.
    Karlsson, Jan
    Umeå University.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Source data for “The effects of water column dissolved oxygen concentrations on lake methane emissions: Results from a whole-lake oxygenation experiment”2022Dataset
    Ladda ner fulltext (xlsx)
    dataset version 2.0
  • 5.
    Pajala, Gustav
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Gålfalk, Magnus
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Seekell, David
    Umea Univ, Sweden.
    Sundgren, Ingrid
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nguyen, Thanh Duc
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Karlsson, Jan
    Umea Univ, Sweden.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    The Effects of Water Column Dissolved Oxygen Concentrations on Lake Methane Emissions-Results From a Whole-Lake Oxygenation Experiment2023Ingår i: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 128, nr 11, artikel-id e2022JG007185Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Lakes contribute 9%-19% of global methane (CH4) emissions to the atmosphere. Dissolved molecular oxygen (DO) in lakes can inhibit the production of CH4 and promote CH4 oxidation. DO is therefore often considered an important regulator of CH4 emissions from lakes. Presence or absence of DO in the water above the sediments can affect CH4 production and emissions by (a) influencing if methane production can be fueled by the most reactive organic matter in the top sediment layer or rely on deeper and less degradable organic matter, and (b) enabling CH4 accumulation in deep waters and potentially large emissions upon water column turnover. However, the relative importance of these two DO effects on CH4 fluxes is still unclear. We assessed CH4 fluxes from two connected lake basins in northern boreal Sweden where one was experimentally oxygenated. Results showed no clear difference in summer CH4 emissions attributable to water column DO concentrations. Large amounts of CH4 accumulated in the anoxic hypolimnion of the reference basin but little of this may have been emitted because of incomplete mixing, and effective methane oxidation of stored CH4 reaching oxic water layers. Accordingly, <= 24% of the stored CH4 was likely emitted in the experimental lake. Overall, our results suggest that hypolimnetic DO and water column CH4 storage might have a smaller impact on CH4 emissions in boreal forest lakes than previous estimates, yet potential fluxes associated with water column turnover events remain a significant uncertainty in lake CH4 emission estimates.

  • 6.
    Rudberg, David
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Duc, N. T.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique Oliveira
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Department of Ecology and Environmental Sciences, Umeå Universitet, Umeå, Sweden.
    Verheijen, H. A.
    Department of Ecology and Environmental Sciences, Umeå Universitet, Umeå, Sweden.
    Melack, J. M.
    Department of Ecology, Evolution, and Marine Biology, University of California Santa Barbara, Santa Barbara, CA, USA University of California Santa Barbara, Earth Research Institute, Santa Barbara, CA, USA.
    MacIntyre, S.
    Department of Ecology, Evolution, and Marine Biology, University of California Santa Barbara, Santa Barbara, CA, USA University of California Santa Barbara, Earth Research Institute, Santa Barbara, CA, USA University of California Santa Barbara, Marine Science Institute, Santa Barbara, CA, USA.
    Karlsson, J.
    Department of Ecology and Environmental Sciences, Umeå Universitet, Umeå, Sweden.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Diel Variability of CO2 Emissions From Northern Lakes2021Ingår i: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 126, nr 10, artikel-id e2021JG006246Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Lakes are generally supersaturated in carbon dioxide (CO2) and emitters of CO2 to the atmosphere. However, estimates of CO2 flux (FCO2) from lakes are seldom based on direct flux measurements and usually do not account for nighttime emissions, yielding risk of biased assessments. Here, we present direct FCO2 measurements from automated floating chambers collected every 2-3 hr and spanning 115 24 hr periods in three boreal lakes during summer stratification and before and after autumn mixing in the most eutrophic lake of these. We observed 40%-67% higher mean FCO2 in daytime during periods of surface water CO2 supersaturation in all lakes. Day-night differences in wind speed were correlated with the day-night FCO2 differences in the two larger lakes, but in the smallest and most wind-sheltered lake peaks of FCO2 coincided with low-winds at night. During stratification in the eutrophic lake, CO2 was near equilibrium and diel variability of FCO2 insignificant, but after autumn mixing FCO2 was high with distinct diel variability making this lake a net CO2 source on an annual basis. We found that extrapolating daytime measurements to 24 hr periods overestimated FCO2 by up to 30%, whereas extrapolating measurements from the stratified period to annual rates in the eutrophic lake underestimated FCO2 by 86%. This shows the importance of accounting for diel and seasonal variability in lake CO2 emission estimates.

    Ladda ner fulltext (pdf)
    fulltext
  • 7.
    Rudberg, David
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ekologisk och miljövetenskaplig modellering. Linköpings universitet, Tekniska fakulteten.
    Sundgren, Ingrid
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nguyen, Thanh Duc
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Karlsson, Jan
    Umea Univ, Sweden.
    Macintyre, Sally
    Univ Calif Santa Barbara, CA USA.
    Melack, John
    Univ Calif Santa Barbara, CA USA.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Contribution of gas concentration and transfer velocity to CO2 flux variability in northern lakes2024Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The CO( 2)flux (FCO2) from lakes to the atmosphere is a large component of the global carbon cycle anddepends on the air-water CO2concentration gradient (Delta CO2) and the gas transfer velocity (k). Both Delta CO2 and k can vary on multiple timescales and understanding their contributions toFCO(2)is important for explaining var-iability influxes and developing optimal sampling designs. We measuredFCO2 and Delta CO(2 )and derivedkforone full ice-free period in 18 lakes usingfloating chambers and estimated the contributions of Delta CO2 and k to FCO2 variability. Generally, kcontributed more than Delta CO2to short-term (1-9d) FCO2 variability. With in creased temporal period, the contribution of k to FCO2 variability decreased, and in some lakes resulted in Delta CO2 contrib-uting more thank to FCO2 variability over the full ice-free period. Increased contribution of Delta CO2 to FCO2 vari-ability over time occurred across all lakes but was most apparent in large-volume southern-boreal lakes and indeeper (>2m) parts of lakes, whereaskwas linked to FCO(2 )variability in shallow waters. Accordingly, knowing the variability of bothk and Delta CO(2 )over time and space is needed for accurate modeling of F CO2 from these vari-ables. We conclude that priority in FCO(2 )assessments should be given to direct measurements of FCO2 at multiplesites when possible, or otherwise from spatially distributed measurements of Delta CO(2 )combined with k- models that incorporate spatial variability of lake thermal structure and meteorology.

  • 8.
    Rudberg, David
    et al.
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tema, Tema Miljöförändring.
    Thanh Duc, Nguyen
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Tekniska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten.
    Gustav, Pajala
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique Oliveira
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Verheijen, Hendricus
    Institutionen för ekologi, miljö och geovetenskap, Umeå Universitet, Umeå.
    Melak, John
    Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California, US; Earth Research Institute, University of California, Santa Barbara, California, USA .
    MacIntyre, Sally
    Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California, US; Earth Research Institute, University of California, Santa Barbara, California, USA; Marine Science Institute, University of California, Santa Barbara, California, USA .
    Karlsson, Jan
    Institutionen för ekologi, miljö och geovetenskap, Umeå Universitet, Umeå.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Source data for "Diel variability of CO2 emissions from Northern lakes and the effect of lake mixing"2020Dataset
    Ladda ner fulltext (xlsx)
    dataset
  • 9.
    Schenk, Jonathan
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique Oliveira
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Hagberg, Emelie
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Fors, Kjell
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Laudon, Hjalmar
    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
    Karlsson, Jan
    Department of Ecology and Environmental Science, Climate Impacts Research Centre, Umeå University, Umeå, Sweden.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Data associated with the manuscript "Methane in Lakes: Variability in Stable Carbon Isotopic Composition and the Potential Importance of Groundwater Input"2021Dataset
    Ladda ner fulltext (csv)
    data set 1
    Ladda ner fulltext (csv)
    data set 2
    Ladda ner fulltext (csv)
    data set 3
  • 10.
    Schenk, Jonathan
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique Oliveira
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Hagberg, Emelie
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Fors, Kjell
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Laudon, Hjalmar
    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
    Karlsson, Jan
    Climate Impacts Research Centre, Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Methane in Lakes: Variability in Stable Carbon Isotopic Composition and the Potential Importance of Groundwater Input2021Ingår i: Frontiers in Earth Science, E-ISSN 2296-6463, Vol. 9, artikel-id 722215Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Methane (CH4) is an important component of the carbon (C) cycling in lakes. CH4 production enables carbon in sediments to be either reintroduced to the food web via CH4 oxidation or emitted as a greenhouse gas making lakes one of the largest natural sources of atmospheric CH4. Large stable carbon isotopic fractionation during CH4 oxidation makes changes in 13C:12C ratio (δ13C) a powerful and widely used tool to determine the extent to which lake CH4 is oxidized, rather than emitted. This relies on correct δ13C values of original CH4 sources, the variability of which has rarely been investigated systematically in lakes. In this study, we measured δ13C in CH4 bubbles in littoral sediments and in CH4 dissolved in the anoxic hypolimnion of six boreal lakes with different characteristics. The results indicate that δ13C of CH4 sources is consistently higher (less 13C depletion) in littoral sediments than in deep waters across boreal and subarctic lakes. Variability in organic matter substrates across depths is a potential explanation. In one of the studied lakes available data from nearby soils showed correspondence between δ13C-CH4 in groundwater and deep lake water, and input from the catchment of CH4 via groundwater exceeded atmospheric CH4 emissions tenfold over a period of 1 month. It indicates that lateral hydrological transport of CH4 can explain the observed δ13C-CH4 patterns and be important for lake CH4 cycling. Our results have important consequences for modelling and process assessments relative to lake CH4 using δ13C, including for CH4 oxidation, which is a key regulator of lake CH4 emissions.

    Ladda ner fulltext (pdf)
    fulltext
  • 11.
    Schenk, Jonathan
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tema, Tema Miljöförändring.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique Oliveira
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Gålfalk, Magnus
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sundgren, Ingrid
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Thanh Duc, Nguyen
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Tekniska fakulteten.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Evaluating Empirical Models of Lake Methane Emission and Surface Water Concentration across Hemiboreal to Subarctic Regions2022Dataset
    Ladda ner fulltext (xlsx)
    Table 1 in the corresponding manuscript
    Ladda ner fulltext (xlsx)
    Table 2 in the corresponding manuscript
  • 12.
    Sieczko, Anna Katarzyna
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Supporting data for "Diel variability of methane emissions from lakes"2020Dataset
    Ladda ner fulltext (csv)
    Flux ratios
    Ladda ner fulltext (csv)
    Mean hourly values
    Ladda ner fulltext (csv)
    dataset
  • 13.
    Sieczko, Anna Katarzyna
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Dang, Nguyen Thong
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Umea Univ, Sweden.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Diel variability of methane emissions from lakes2020Ingår i: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 117, nr 35, s. 21488-21494Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Lakes are considered the second largest natural source of atmospheric methane (CH4). However, current estimates are still uncertain and do not account for diel variability of CH4 emissions. In this study, we performed high-resolution measurements of CH4 flux from several lakes, using an automated and sensor-based flux measurement approach (in total 4,580 measurements), and demonstrated a clear and consistent diel lake CH4 flux pattern during stratification and mixing periods. The maximum of CH4 flux were always noted between 10:00 and 16:00, whereas lower CH4 fluxes typically occurred during the nighttime (00:00-04:00). Regardless of the lake, CH4 emissions were on an average 2.4 higher during the day compared to the nighttime. Fluxes were higher during daytime on nearly 80% of the days. Accordingly, estimates and extrapolations based on daytime measurements only most likely result in overestimated fluxes, and consideration of diel variability is critical to properly assess the total lake CH4 flux, representing a key component of the global CH4 budget. Hence, based on a combination of our data and additional literature information considering diel variability across latitudes, we discuss ways to derive a diel variability correction factor for previous measurements made during daytime only.

    Ladda ner fulltext (pdf)
    fulltext
  • 14.
    Sieczko, Anna Katarzyna
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ekologisk och miljövetenskaplig modellering. Linköpings universitet, Tekniska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för tema, Tema Miljöförändring.
    Nguyen, Thanh Duc
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Tekniska fakulteten.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Data set associated with the manuscript submitted to Science of the Total Environment by Sieczko et.al 20232023Dataset
    Ladda ner fulltext (xlsx)
    Data set
  • 15.
    Sieczko, Anna
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Schenk, Jonathan
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Rudberg, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nguyen, Thanh Duc
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Pajala, Gustav
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Sawakuchi, Henrique
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Bastviken, David
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Minor impacts of rain on methane flux from hemiboreal, boreal, and subarctic lakes2023Ingår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 895, artikel-id 164849Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Methane (CH4) emissions (FCH4) from northern freshwater lakes are not only significant but also highly variable in time and one driver variable suggested to be important is precipitation. Rain can have various, potentially large effects on FCH4 across multiple time frames, and verifying the impact of rain on lake FCH4 is key to understand both contemporary flux regulation, and to predict future FCH4 related to possible changes in frequency and intensity of rainfall from climate change. The main objective of this study was to assess the short-term impact of typically occurring rain events with different intensity on FCH4 from various lake types located in hemiboreal, boreal, and subarctic Sweden. In spite of high time resolution automated flux measurements across different depth zones and covering numerous commonly types of rain events in northern areas, in general, no strong impact on FCH4 during and within 24 h after the rainfall could be observed. Only in deeper lake areas and during longer rain events FCH4 was weakly related to rain (R2 = 0.29, p < 0.05), where a minor FCH4 decrease during the rain was identified, suggesting that direct rainwater input, during greater rainfall, may decrease FCH4 by dilution of surface water CH4. Overall, this study indicates that typical rain events in the studied regions have minor direct short-term effects on FCH4 from northern lakes and do not enhance FCH4 from shallow and deeper parts of lakes during and up to 24-h after the rainfall. Instead, other factors such as wind speed, water temperature and pressure changes were more strongly correlated with lake FCH4.

    Ladda ner fulltext (pdf)
    fulltext
  • 16.
    Sieczko, Anna
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ekologisk och miljövetenskaplig modellering. Linköpings universitet, Tekniska fakulteten.
    van de Vlasakker, Paulien
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ekologisk och miljövetenskaplig modellering. Linköpings universitet, Tekniska fakulteten.
    Tonderski, Karin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten.
    Metson, Genevieve
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ekologisk och miljövetenskaplig modellering. Linköpings universitet, Tekniska fakulteten.
    Seasonal nitrogen and phosphorus leaching in urban agriculture: Dominance of non-growing season losses in a Southern Swedish case study2023Ingår i: Urban Forestry & Urban Greening, ISSN 1618-8667, E-ISSN 1610-8167, Vol. 79, artikel-id 127823Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Urban agriculture, as most agriculture, can potentially contribute to eutrophication via losses to ground and surface water. Few published studies have empirically measured nitrogen and phosphorus losses (including leaching) from urban agriculture, and even fewer have examined losses in real-world settings throughout the year. Here we investigated year-round (May 2020-2021) weekly nitrogen and phosphorus leaching from allot-ment gardens in Linko center dot ping, southern Sweden. We installed eight lysimeters (8 plots) and collected water 0.3 m below the soil surface in four gardens (2 plots per garden), each with their own gardening practices (organic fertilizers, irrigation, and crops). The gardens exhibited large nutrient leaching per area cultivated compared to observed nutrient leachate in rural agriculture in similar climates. There was a large variability among studied plots, where nitrogen leaching reached 39-191 kg ha-1 y-1 and phosphorus 0.9-2.4 kg ha-2 y-1. Importantly, the non-growing season, especially snowmelt, was a key period for leaching. Most of the nitrogen (78-91 %) and phosphorus (45-97 %) leaching occurred from November to April when the soil was bare, suggesting that mineralization of organic matter was important. Three of the gardens received high amounts of organic fertil-izers, though no clear relation between inputs and leaching could be discerned. One plot deviated from the pattern, with less than 40 % of the nutrient leaching occurring in the non-growing season. This gardener had a fine net covering the plot to deter insects. This protected from precipitation as the water volume collected was the lowest, with only 26 % collected in the non-growing season, and nitrogen leaching was also the lowest. Our results illustrate that additional monitoring studies should occur year-round and in several gardens to account for high temporal and spatial heterogeneity and avoid under-estimating leaching losses from urban agriculture. Providing guidance on fertilization, irrigation, and soil covering may be a way to minimize leaching.

    Ladda ner fulltext (pdf)
    fulltext
1 - 16 av 16
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf