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  • 1.
    Borg, H
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Wällstedt, T
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Inverkan av kalkning på metaller i sjöar. Redovisning av delprojekt 2a.4 inom IKEU-utvärderingen 20082008Report (Other academic)
  • 2.
    Borg, Hans
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Andrén,
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Sundbom,
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Wilander, A.
    Wällstedt,
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Episodförsurning - Underlag till Naturvårdsverkets handbok för kalkning av sjöar och vattendrag.2007Report (Other (popular science, discussion, etc.))
  • 3. Claremar, Björn
    et al.
    Wällstedt, Teresia
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Rutgersson, Anna
    Omstedt, Anders
    Deposition of acidifying and neutralising compounds over the Baltic Sea drainage basin between 1960 and 20062013In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 18, no 6, p. 425-445Article in journal (Refereed)
    Abstract [en]

    This study produced a gridded database of acidifying and eutrophying deposition in the Baltic Sea and its drainage basin for the period 1960-2006. Data from various data sets were combined to generate monthly atmospheric (wet) deposition of cations (Ca2+, Mg2+, Na+, K+ and NH4+) and anions (SO42-, NO3- and Cl-). Output of a chemical transport model and interpolated measurements were used, and when these were not available, trends and seasonal cycles were constructed from historical emissions and deposition data. These methods lose some spatial patterns, but the mean trends reflect the influence of east-European emissions more than earlier studies with more westerly-centred observations. The calculated depositions of sulphur, nitrogen and calcium (correlated with sulphur emission) increased from 1960 to 1990 and then decreased until 2006. The trend is most evident for sulphur with a 100% increase followed by a 73% decrease.

  • 4.
    Edberg, F
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Wällstedt, T
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Borg, H
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Kalkningsavslut i Tyresta – utvärdering och komplettering av kemi och metaller i vatten och sediment2008Report (Other academic)
  • 5.
    Edberg, Frida
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Hägglund, Anna
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Wällstedt, Teresia
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Borg, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Holmström, Sara J. M.
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Geochemistry of metals in a former uranium open pit mine – size fractionation of the water columnManuscript (preprint) (Other academic)
  • 6.
    Eriksson Hägg, Hanna
    et al.
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre, Baltic Nest Institute.
    Lyon, Steve W.
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre, Baltic Nest Institute.
    Wällstedt, Teresia
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Mörth, Carl-Magnus
    Stockholm University, Faculty of Science, Department of Geological Sciences. Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre, Baltic Nest Institute.
    Claremar, Björn
    Humborg, Christoph
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM). Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre, Baltic Nest Institute.
    Future nutrient load scenarios for the Baltic Sea due to climate and lifestyle changes2014In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 43, no 3, p. 337--351Article in journal (Refereed)
    Abstract [en]

    Dynamic model simulations of the future climate and projections of future lifestyles within the Baltic Sea Drainage Basin (BSDB) were considered in this study to estimate potential trends in future nutrient loads to the Baltic Sea. Total nitrogen and total phosphorus loads were estimated using a simple proxy based only on human population (to account for nutrient sources) and stream discharges (to account for nutrient transport). This population-discharge proxy provided a good estimate for nutrient loads across the seven sub-basins of the BSDB considered. All climate scenarios considered here produced increased nutrient loads to the Baltic Sea over the next 100 years. There was variation between the climate scenarios such that sub-basin and regional differences were seen in future nutrient runoff depending on the climate model and scenario considered. Regardless, the results of this study indicate that changes in lifestyle brought about through shifts in consumption and population potentially overshadow the climate effects on future nutrient runoff for the entire BSDB. Regionally, however, lifestyle changes appear relatively more important in the southern regions of the BSDB while climatic changes appear more important in the northern regions with regards to future increases in nutrient loads. From a whole-ecosystem management perspective of the BSDB, this implies that implementation of improved and targeted management practices can still bring about improved conditions in the Baltic Sea in the face of a warmer and wetter future climate

  • 7. Omstedt, Anders
    et al.
    Edman, Moa
    Claremar, Bjorn
    Frodin, Peter
    Gustafsson, Erik
    Stockholm University, Stockholm Resilience Centre, Baltic Nest Institute.
    Humborg, Christoph
    Stockholm University, Stockholm Resilience Centre, Baltic Nest Institute.
    Hägg, Hanna
    Stockholm University, Stockholm Resilience Centre, Baltic Nest Institute.
    Mörth, Magnus
    Stockholm University, Stockholm Resilience Centre, Baltic Nest Institute.
    Rutgersson, Anna
    Schurgers, Guy
    Smith, Benjamin
    Wällstedt, Teresia
    Stockholm University, Stockholm Resilience Centre, Baltic Nest Institute.
    Yurova, Alla
    Future changes in the Baltic Sea acid-base (pH) and oxygen balances2012In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 64, p. 19586-Article in journal (Refereed)
    Abstract [en]

    Possible future changes in Baltic Sea acid-base (pH) and oxygen balances were studied using a catchment-sea coupled model system and numerical experiments based on meteorological and hydrological forcing datasets and scenarios. By using objective statistical methods, climate runs for present climate conditions were examined and evaluated using Baltic Sea modelling. The results indicate that increased nutrient loads will not inhibit future Baltic Sea acidification; instead, the seasonal pH cycle will be amplified by increased biological production and mineralization. All examined scenarios indicate future acidification of the whole Baltic Sea that is insensitive to the chosen global climate model. The main factor controlling the direction and magnitude of future pH changes is atmospheric CO2 concentration (i.e. emissions). Climate change and land-derived changes (e. g. nutrient loads) affect acidification mainly by altering the seasonal cycle and deep-water conditions. Apart from decreasing pH, we also project a decreased saturation state of calcium carbonate, decreased respiration index and increasing hypoxic area - all factors that will threaten the marine ecosystem. We demonstrate that substantial reductions in fossil-fuel burning are needed to minimise the coming pH decrease and that substantial reductions in nutrient loads are needed to reduce the coming increase in hypoxic and anoxic waters.

  • 8.
    Sundbom,
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Andrén,
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Borg, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Edberg, Frida
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Persson, G.
    Wällstedt,
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Kalkningsavslut - Underlag till Naturvårdsverkets handbok för kalkning av sjöar och vattendrag.2007Report (Other (popular science, discussion, etc.))
  • 9.
    Wallstedt, Teresia
    et al.
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Björkvald, Louise
    Gustafsson, Jon Petter
    Increasing concentrations of arsenic and vanadium in (southern) Swedish streams2010In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 25, no 8, p. 1162-1175Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to investigate temporal trends and controlling factors of As and V in running waters throughout Sweden. For this purpose, data on stream water chemistry from 62 streams of varying catchment size and characteristics, included in the Swedish environmental monitoring programmes were evaluated. The geochemical software Visual MINTEQ was used to model the speciation and trend analyses were performed on total concentrations of As and Vas well as modelled fractions (dissolved species as well as arsenate and vanadate adsorbed to ferrihydrite). The trend analyses showed increasing total concentrations of As and V in southern Sweden. Concentrations of As and V correlated significantly to Fe concentrations in 59 and 60 of the 62 streams respectively, indicating that Fe is an important determining factor for As and V concentrations in Swedish streams. This was confirmed by the geochemical modelling that indicated that the adsorbed fraction is the dominant form of As and V and that the concentrations of As and V in Swedish streams are thus highly determined by concentrations of colloidal or particulate Fe. It is therefore suggested that the increasing trends of As and V are to a large extent due to increasing concentrations of colloidal Fe, which is stabilised by increasing concentrations of DOC. Further the geochemical modelling indicates that the dissolved fraction of As and V generally is small, with the exception of a few streams with high pH and/or phosphate concentrations.

  • 10.
    Wällstedt,
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Fastläggning av metaller i sediment i överkalkade sjöar2007Report (Other (popular science, discussion, etc.))
  • 11.
    Wällstedt,
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Oförbrukade kalkdepåer i sjösediment2007Report (Other (popular science, discussion, etc.))
  • 12.
    Wällstedt, T
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Borg, H
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Meili, M
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Mörth, C.M.
    Influence of liming on metal sequestration in lake sediments over recent decades.2008In: Sci. Tot. Environ., Vol. 407, p. 405-417Article in journal (Refereed)
  • 13.
    Wällstedt, Teresia
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Lime Residues and Metal Sequestration in Sediments of Excessively Limed Lakes2011In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 219, no 1-4, p. 535-546Article in journal (Refereed)
    Abstract [en]

    Sediment profiles from ten excessively limed lakes were used to study the occurrence of lime residues as a result of incomplete lime dissolution and the influence of treatment with very high lime doses on the sequestration of metals in lake sediments. The sediment profiles were subjected to multi-element analysis and compared to sediment profiles from previous studies of lakes limed with normal lime doses and untreated reference lakes. The high lime doses were found to result in large lime residues in the sediment, with lime concentrations of up to 70% of the dry sediment in the studied lakes. Excessive liming, like liming with normal doses, was found to cause increased sequestration in sediments of, e.g. Cd, Co, Ni and Zn, metals where the mobility is known to be highly pH dependent, compared to non-limed reference lakes. No effect of liming on the sequestration of Cu, Cr, Pb and V could be shown. The size of the lime dose did not seem to influence the metal sequestration in the sediment, since no difference between the excessively limed lakes and lakes limed with normal doses was found. On the contrary, the large lime residues were found to cause a dilution of the metal concentrations in the sediments, since lime products used for lake liming generally have lower metal concentrations compared to the sediments.

1 - 13 of 13
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