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  • 1.
    Andersson, Lars
    et al.
    Ocean. Lab. SMHI.
    Rahm, Lars
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Thermally driven circulation within an experimental enclosure1990In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 30, p. 111-129Article in journal (Refereed)
    Abstract [en]

      

  • 2.
    Conley, D.J.
    et al.
    DMU.
    Stockenberg, A.
    SU.
    Johnstone, R.
    University of Queensland.
    Wulff, F.
    SU.
    Rahm, Lars
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Sediment-water nutrient fluxes along a eutrophicated gradient in the Gulf of Finland, Baltic Sea1997In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 45, p. 591-598Article in journal (Refereed)
  • 3.
    Danielsson, Åsa
    et al.
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Carman, R.
    SU.
    Rahm, Lars
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Aigars, J.
    SU.
    Spatial estimation of nutrient distributions in the Gulf of Riga sediments using cokriging.1998In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 46, p. 713-722Article in journal (Refereed)
  • 4.
    Humborg, Christoph
    et al.
    SU.
    Danielsson, Åsa
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Sjöberg, Björn
    GU.
    Gren, Mattias
    GU.
    Nutrient land-sea fluxes in oligothrophic and pristine estuaries of the Gulf of Bothnia, Baltic Sea2003In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 56, no 3-4, p. 781-793Article in journal (Refereed)
    Abstract [en]

    Estuaries are often seen as important filters between land and the sea for inorganic and organic nutrients. This paper aims at estimating the estuarine fluxes of dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP) and dissolved silicate for the major oligothrophic and pristine rivers running into the Bothnian Bay (BB) and the Bothnian Sea (BS), the northern subarctic subbasins of the Baltic Sea. Long-term data sets for these rivers and their estuaries as well as for the BB and BS were analyzed to assess whether these estuaries are sinks for inorganic nutrients. Most studied estuaries can be characterized as salt wedge estuaries with little exchange between the fresh seaward-flowing river water and the inward-flowing seawater. Estimates of water transit times ranged between 1 and 14 days. In most estuaries of the BB, N-depleted river water meets P-depleted seawater during the growth period. These findings were corroborated by mixing diagrams showing that the inner areas of the estuaries were N-depleted in summer. In the BS, on the other hand, both rivers and seawater were mostly N-depleted during summer. Thus, for most estuaries of this region of the Baltic Sea, primary productivity is presumably lower than or equal to that of offshore. The low productivity is also reflected in the sediments. The coastal sediments did not differ from the offshore stations in accumulation rates as well as the content of organic matter and nutrients, indicating that estuarine nutrient burial is not always higher as normally observed in other temperate systems. Finally, the estuaries of the pristine rivers in the northernmost part of the BB import DIN during summer, whereas the estuaries of the rivers in the BS import DIP during winter, from the sea. ⌐ 2003 Elsevier Science B.V. All rights reserved.

  • 5.
    Papush, Liana
    et al.
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Danielsson, Åsa
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Silicon in the marine environment: Dissolved silica trends in the Baltic Sea2006In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 67, no 1-2, p. 53-66Article in journal (Refereed)
    Abstract [en]

    Dissolved silica (DSi) is an important nutrient for primary production. During the last decades, negative trends in DSi concentrations have been observed in coastal areas globally, with implications for the marine ecosystem. This tendency is mainly attributed to two processes: decrease in river loadings (as a result of water regulation and building of dams) and eutrophication in the coastal zone, with subsequent silica depletion. One such area affected by both an intensive water regulation and eutrophication is the Baltic Sea. The present study focused on the pelagic DSi trends in different parts of the Baltic Sea for the last three decades. It was found that there are decreasing trends for most of areas and water depths ranging between -0.05 and -1.2 μmol Si l -1 yr-1. The trends are levelling out during the last decade. Since the riverine load of dissolved silica has not changed at a corresponding rate during the time period, the decrement is assumed to be mainly a result of the ongoing eutrophication within the marine water body. This assumption was strengthened by the increasing trends of inorganic nitrogen and phosphorus. © 2005 Elsevier Ltd. All rights reserved.

  • 6.
    Pettersson, Carina
    et al.
    Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute, Technology and Social Change.
    Allard, Bert
    Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute, Department of Water and Environmental Studies.
    Borén, Hans
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Organic Analytical Chemistry .
    River Discharge of Humic Substances and Humic-bound Metals to the Gulf of Bothnia1997In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 44, no 5, p. 533-541Article in journal (Refereed)
  • 7.
    Rahm, Lars
    et al.
    Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute, Department of Water and Environmental Studies.
    Andersson, Lars
    Ocean. Lab. SMHI.
    Heat balance in a shallow cove1986In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 23, p. 705-724Article in journal (Refereed)
  • 8.
    Rahm, Lars
    et al.
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Danielsson, Åsa
    Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
    Spatial heterogeneity of nutrients in the Baltic Proper, Baltic Sea2007In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 73, no 1-2, p. 268-278Article in journal (Refereed)
    Abstract [en]

    The Baltic Proper shows many signs of eutrophication. Nutrient changes over time have been discernable, and also within the Sea there are large spatial patterns. Present study analyses the spatial patterns of dissolved inorganic nitrogen and phosphorus as well as dissolved silicate (DSi) in the euphotic zone for the period 1990-2001. The focus is on the spatial heterogeneity with the aim to identify areas significantly different from the overall mean.

    Three regions are clearly discernible, the interior, the western and the eastern coastal zones. This is further complicated by the Gulfs of Finland and Riga with distinct different behaviour compared to the other ones. While the coastal zones are re-supplied by their terrestrial sources, the exchange with the interior is limited by geophysical constraints. The western border shows permanently high DSi but low DIN and DIP concentrations. The riverine loads of DIN, DIP and DSi are low but a large transport of DSi probably takes place from the Bothnian Sea to the Kattegat along the western coast with only minor retention. The eastern region, on the other hand, is characterised by both high nutrient loads and high production. These spatial patterns agree well with a conceptual model where the spring bloom leads to an interior generally low in DIN. This favours N-fixating cyanobacteria blooms at the expense of diatoms. This view is supported by decreasing DIP concentrations but unaffected DSi levels. The spatial patterns observed well reflect the riverine nutrient loads. This should be regarded in future remedy plans for the eutrophic Baltic Sea. The terrestrial load can have very different impacts on the ecosystems depending on which coastal section is involved.

  • 9.
    Yang, P.
    et al.
    Fujian Normal University, Peoples R China.
    Bastviken, David
    Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
    Lai, D. Y. F.
    Chinese University of Hong Kong, Peoples R China.
    Jin, B. S.
    Fujian Normal University, Peoples R China.
    Mou, X. J.
    Chinese Academic Science, Peoples R China.
    Tong, C.
    Fujian Normal University, Peoples R China; Fujian Normal University, Peoples R China; Fujian Normal University, Peoples R China.
    Yao, Y. C.
    Chinese Academic Science, Peoples R China.
    Effects of coastal marsh conversion to shrimp aquaculture ponds on CH4 and N2O emissions2017In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 199, p. 125-131Article in journal (Refereed)
    Abstract [en]

    In this study, we compared the CH4 and N2O fluxes from a tidal brackish Cyperus malaccensis marsh ecosystem and nearby shrimp ponds, converted from C malaccensis marsh in the last 3-4 years, in the Min River estuary of southeast China over the aquaculture period of the year. Significant differences in CH4 and N2O fluxes were observed in space (between brackish marsh and shrimp ponds) and in time (between sampling occasions that were distributed over the aquaculture period). CH4 fluxes from the shrimp ponds were on an average 10-fold higher than from the brackish marsh. N2O emissions, on the other hand, were lower from the shrimp pond (25% of the emissions from the brackish marsh). Accessory data indicates that these patterns were primarily linked to water level variability and temperature (all fluxes), sediment porewater sulfate concentrations (CH4 flux) and total nitrogen concentrations (N2O flux). Our research demonstrates that the coastal marsh ecosystem converted to aquaculture ponds considerably alter emissions of CH4 and N2O and provides input to the global discussion on how to account for emissions from various types of flooded land in greenhouse gas inventories. (C) 2017 Elsevier Ltd. All rights reserved.

  • 10.
    Yurkovskis, A.
    et al.
    University of Latvia.
    Wulff, F.
    Dept. of Systems Ecology Stockholm University.
    Rahm, Lars
    Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute, Department of Water and Environmental Studies.
    Rodrigues-Medina, M.
    Dept. of Systems Ecology Stockholm University.
    Androzaitis, A.
    Dept. of Biology University of Latvia.
    A nutrient budget of the Gulf of Riga, Baltic Sea.1993In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 37, p. 113-127Article in journal (Refereed)
1 - 10 of 10
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