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  • 1. Buffam, Ishi
    et al.
    Laudon, Hjalmar
    Temnerud, Johan
    Örebro University, Department of Natural Sciences.
    Morth, Carl-Magnus
    Bishop, Kevin
    Landscape-scale variability of acidity and dissolved organic carbon during spring flood in a boreal stream network2007In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 112, no G1, p. G01022-Article in journal (Refereed)
    Abstract [en]

    Acidity is well known to influence stream biota, but the less well-studied spatial and temporal distributions of acidity are likely to play a larger ecological role than average values. We present data on spatial variability of chemical parameters contributing to acidity during winter baseflow and spring flood periods in Krycklan, a fourth-order boreal stream network in northern Sweden. Fifteen stream sites were monitored in subcatchments spanning 3 orders of magnitude in size and representing a wide range of percent wetland. At baseflow, pH ranged from 3.9 to 6.5 at the different sites. Baseflow dissolved organic carbon (DOC) concentration varied by an order of magnitude and was positively correlated with subcatchment percent wetland, resulting in high spatial variability in dissociated organic acids (OA(-)). During spring flood, DOC and OA(-) increased in forested sites and decreased in wetland sites, resulting in reduced spatial variability in their concentrations. In contrast, base cations and strong acid anions diluted throughout the stream network, resulting in decreased acid neutralizing capacity (ANC) at all sites. The spatial variability of base cations increased slightly with high flow. As a result of the changes in OA(-) and ANC, pH dropped at all but the most acidic site, giving a slightly narrowed pH range during spring flood (4.2-6.1). The transition from winter to spring flood stream chemistry could largely be explained by: (1) a shift from mineral to upper riparian organic soil flow paths in forested catchments and (2) dilution of peat water with snowmelt in wetland catchments.

  • 2.
    Koch, Alina
    et al.
    Örebro University, School of Science and Technology.
    Kärrman, Anna
    Örebro University, School of Science and Technology.
    Yeung, Leo W. Y.
    Örebro University, School of Science and Technology.
    Jonsson, Micael
    Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
    Ahrens, Lutz
    Section for Organic Environmental Chemistry and Ecotoxicology, Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden.
    Wang, Thanh
    Örebro University, School of Science and Technology.
    Point source characterization of per- and polyfluoroalkyl substances (PFASs) and extractable organofluorine (EOF) in freshwater and aquatic invertebrates2019In: Environmental Science: Processes & Impacts, ISSN 2050-7887, E-ISSN 2050-7895, Vol. 21, no 11, p. 1887-1898Article in journal (Refereed)
    Abstract [en]

    Major point sources of per- and polyfluoroalkyl substances (PFASs) cause ubiquitous spread of PFASs in the environment. In this study, surface water and aquatic invertebrates at three Swedish sites impacted by PFAS point sources were characterized, using homologue, isomer and extractable organofluorine (EOF) profiling as well as estimation of bioaccumulation factors (BAFs) and mass discharge. Two sites were impacted by fire training (sites A and R) and the third by industrial runoff (site K). Mean Σ25PFASs concentration in water was 1920 ng L-1 at site R (n = 3), which was more than 20- and 10-fold higher than those from sites A and K, respectively. PFOS was the most predominant PFAS in all waters samples, constituting 29-79% of Σ25PFAS concentrations. Several branched isomers were detected and they substantially contributed to concentrations in surface water (e.g. 49-78% of ΣPFOS) and aquatic invertebrates (e.g. 15-28% of ΣPFOS). BAFs in the aquatic invertebrates indicated higher bioaccumulation for long chain PFASs and lower bioaccumulation for branched PFOS isomers compared to linear PFOS. EOF mass balance showed that Σ25target PFASs in water could explain up to 55% of EOF at site R. However, larger proportions of EOF (>92%) remained unknown in water from sites A and K. Mass discharges were for the first time estimated for EOF and revealed that high amounts of EOF (e.g. 8.2 g F day-1 at site A) could be transported by water to recipient water bodies relative to Σ25PFASs (e.g. 0.15 g day-1 at site A). Overall, we showed that composition profiling, BAFs and EOF mass balance can improve the characterization of PFASs around point sources.

  • 3.
    Kucner, Tomasz Piotr
    et al.
    Örebro University, School of Science and Technology.
    Lilienthal, Achim
    Örebro University, School of Science and Technology.
    Magnusson, Martin
    Örebro University, School of Science and Technology.
    Palmieri, L.
    Corporate Research, Robert Bosch GmbH, Renningen, Germany.
    Swaminathan, Chittaranjan Srinivas
    Örebro University, School of Science and Technology.
    Modelling Motion Patterns with Conditional Transition Map2020In: Probabilistic Mapping of Spatial Motion Patterns for Mobile Robots, Springer, 2020, p. 33-64Chapter in book (Refereed)
    Abstract [en]

    The key idea of modelling flow of discrete objects is to capture the way they move through the environment. One method to capture the flow is to observe changes in occupancy caused by the motion of discrete objects. In this chapter, we present a method to model and learn occupancy shifts caused by an object moving through the environment. The key idea is observe temporal changes changes in the occupancy of adjacent cells, and based on the temporal offset infer the direction of the occupancy flow.

  • 4. Long, A J
    et al.
    Smith, D E
    Mörner, Nils-Axel
    Dawson, S
    Final Report of the INQUA Shorelines Subcommission on Western Europe2005In: Journal of Coastal Research, ISSN 0749-0208, E-ISSN 1551-5036, p. 43-51Article in journal (Refereed)
    Abstract [en]

    We provide a short report on the final year of the INQUA Shorelines Subcommission on Western Europe (2002-3). This includes a review of activities under four themes: sea-level changes in the next century; sea-level changes along a north-south transect from the uplifting coasts of Fennoseandanvia to the subsiding coasts of the North Sea and the Baltic, and the meta stable areas such as Portugal and France; comparisons between modeled and empirical observations of relative sea-level (RSL) change, and palaeo-tsunami and storm records. We conclude by providing a report on the final 2002 Annual Meeting including its field meeting at Greifswald and Mecklenburg-West Pomerania and provide a list of some recent publications by members of the INQUA Shorelines Subcommission.

  • 5. Mörner, Nils-Axel
    Some problems in the reconstruction of mean sea level and its changes with time2010In: Quaternary International, ISSN 1040-6182, E-ISSN 1873-4553, Vol. 221, no 1-2, p. 3-8Article in journal (Refereed)
    Abstract [en]

    The ocean level is constantly changing and there are many different forcing functions. Today, we realize that a rise in one area may, in fact, correspond to a fall in another area. A number of problems or pit-falls in sea level analyses are highlighted; viz, the significance of shore morphology, the multiple possible causes of coastal erosion, the necessity to consider cyclic changes, not least the 18.6 tidal cycle and its relation to our tide-gauge records, the effects of redistribution of ocean water masses, the problems with many sea level curves based solely on isolation levels, and the problems of transferring time/depth graphs into rates of sedimentation and sea level rise without having investigated and calibrated for ongoing consolidation in the top-part of the sediment sequence; i.e. the zone of active compaction. Therefore, the necessity of multi-parameter analyses is strongly proposed. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.

  • 6. Mörner, Nils-Axel
    et al.
    Laborel, Jacques
    Dawson, Sue
    Submarine "Sandstorms" and Tsunami Events in the Indian Ocean2008In: Journal of Coastal Research, ISSN 0749-0208, E-ISSN 1551-5036, Vol. 24, no 6, p. 1608-1611Article in journal (Refereed)
    Abstract [en]

    The December 26, 2004, disastrous tsunami event in the Indian Ocean may have come as a shock and even a surprise to the communities outside geosciences. However, tsunami events are a natural part of the geosystems in regions of submarine earthquakes, and they will continue to hit the region even in the future. Here we present evidence of former tsunami events both on Sri Lanka and on the Maldives. Submarine "sandstorms" driven by tsunami waves brought littoral deposits down into eaves 21 to 38 m below sea level. Radiocarbon dates allow the comparison with related tsunami signals in fens and lagoons, and historical documentation. The terrible December 26 event has raised a general awareness of tsunami events. It has also generated the installation of necessary warning systems. We are in urgent need, however, of a long-term tsunami chronology for a realistic tsunami hazards assessment.

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