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  • A nitrogen fixation estimate for the Baltic Sea based on continuous pCO2 measurements on a cargo ship and total nitrogen data.

    Author(s) : Schneider, B.Kaitala, S.Raateoja, M.Sadkowiak, B.

    Author Affiliation : Leibniz Institute for Baltic Sea Research, Seestrasse 15, D-18119 Warnemuende, Germany.

    Author Email : bernd.schneider@io-warnemuende.de

    Journal article : Continental Shelf Research 2009 Vol.29 No.11/12 pp.1535-1540

    Abstract : Organic matterorganic matterSubject Category: Miscellaneous
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    production and nitrogen fixationnitrogen fixationSubject Category: Natural Processes
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    in the central Baltic Seabaltic seaSubject Category: Geographic Entities
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    were studied on the basis of high-resolution CO2 partial pressure data that were obtained from an automated measurement system deployed on a cargo ship. The net organic carbonorganic carbonSubject Category: Miscellaneous
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    (OC) production was calculated from a surface watersurface waterSubject Category: Miscellaneous
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    CO2 mass balance and used to estimate the nitrogen uptake by organic matter during the period March to August 2005. It was shown that the net OC production continued despite the exhaustion of dissolved inorganic nitrogen (DIN) after the spring bloom in April. The nitrogen demand for this production was calculated on the basis of the C/N ratio of organic matter. It was of the same order of magnitude than the winter DIN concentration that fuelled the spring bloom. Since the atmospheric DIN deposition was negligible and no indications of alternative DIN sources were found, it was assumed that N2 fixation had taken place despite the low temperatures (4-8°C) in April/May. This "cold fixation" amounted to 74 mmol m-2 whereas a value of 99 mmol m-2 was obtained for the summer N2 fixation during June/July. Due to the contribution of the April/May N2 fixation, a total annual rate (173±35 mmol m-2) was obtained for 2005 which is considerably higher than presently accepted estimates. These findings were confirmed by a nitrogen budget based on long-term data (1993-2006) for total nitrogen and total phosphorusphosphorusSubject Category: Chemicals and Chemical Groups
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    concentrations. Furthermore, these data revealed a 30% increase in N2 fixation during the years 1994-2006.

    ISSN : 0278-4343

    DOI : 10.1016/j.csr.2009.04.001

    Record Number : 20093188213

    Publisher : Pergamon Press

    Location of publication : Oxford

    Country of publication : UK

    Language of text : English

    Indexing terms for this abstract:

    Descriptor(s) : algal bloomsalgal bloomsSubject Category: Miscellaneous
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    , carbon dioxidecarbon dioxideSubject Category: Chemicals and Chemical Groups
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    , carbon-nitrogen ratiocarbon-nitrogen ratioSubject Category: Properties
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    , nitrogennitrogenSubject Category: Chemicals and Chemical Groups
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    , nitrogen fixationnitrogen fixationSubject Category: Natural Processes
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    , organic carbonorganic carbonSubject Category: Miscellaneous
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    , organic matterorganic matterSubject Category: Miscellaneous
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    , phosphorusphosphorusSubject Category: Chemicals and Chemical Groups
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    , surface watersurface waterSubject Category: Miscellaneous
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    Geographical Location(s) : Baltic Seabaltic seaSubject Category: Geographic Entities
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    Broader term(s) : Northeast Atlanticnortheast atlanticSubject Category: Geographic Entities
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    , Atlantic Oceanatlantic oceanSubject Category: Geographic Entities
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