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Ocean Dynamics

, Volume 59, Issue 2, pp 263–275 | Cite as

Distributions and characteristics of dissolved organic matter in temperate coastal waters (Southern North Sea)

  • Andrea LübbenEmail author
  • Olaf Dellwig
  • Sandra Koch
  • Melanie Beck
  • Thomas H. Badewien
  • Sibylle Fischer
  • Rainer Reuter
Article

Abstract

The spatial and temporal distributions of chromophoric dissolved organic matter (CDOM) and dissolved organic carbon (DOC) was studied in the East-Frisian Wadden Sea (Southern North Sea) during several cruises between 2002 and 2005. The spatial distribution of CDOM in the German Bight shows a strong gradient towards the coast. Tidal and seasonal variations of dissolved organic matter (DOM) identify freshwater discharge via flood-gates at the coastline and pore water efflux from tidal flat sediments as the most important CDOM sources within the backbarrier area of the Island of Spiekeroog. However, the amount and pattern of CDOM and DOC is strongly affected by various parameters, e.g. changes in the amount of terrestrial run-off, precipitation, evaporation, biological activity and photooxidation. A decoupling of CDOM and DOC, especially during periods of pronounced biological activity (algae blooms and microbial activity), is observed in spring and especially in summer. Mixing of the endmembers freshwater, pore water, and open sea water results in the formation of a coastal transition zone. Whilst an almost conservative behaviour during mixing is observed in winter, summer data point towards non-conservative mixing.

Keywords

CDOM Gelbstoff DOM DOC Fluorescence Wadden Sea German Bight 

Notes

Acknowledgements

The authors would like to thank the crews of R/V Senckenberg and R/V Heincke for their assistance and facilitation during the cruises. We wish to thank I. Ötken and A. Braun for their helpful assistance with the sample collection and analysis. We are also grateful to L. Aden (Niedersächsischer Landesbetrieb für Wasserwirtschaft, Küsten- und Naturschutz, NLWKN) and J. Meinen-Hieronimus for providing the terrestrial run-off volumes via the flood-gates of Neuharlingersiel. The investigations are part of the research programme BioGeoChemistry of Tidal Flats funded by the Deutsche Forschungsgemeinschaft (DFG) through grants FOR 432/1-1, RE 624/5 and BR 775/14-1/2.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Andrea Lübben
    • 1
    • 5
    Email author
  • Olaf Dellwig
    • 2
    • 4
  • Sandra Koch
    • 3
  • Melanie Beck
    • 4
  • Thomas H. Badewien
    • 1
  • Sibylle Fischer
    • 4
  • Rainer Reuter
    • 1
  1. 1.Institute of PhysicsCarl von Ossietzky University of OldenburgOldenburgGermany
  2. 2.Leibniz Institute for Baltic Sea ResearchRostockGermany
  3. 3.Faculty of TechnologyUniversity of Applied Sciences Fachhochschule Oldenburg/Ostfriesland/WilhelmshavenEmdenGermany
  4. 4.Institute for Chemistry and Biology of the Marine EnvironmentCarl von Ossietzky University of OldenburgOldenburgGermany
  5. 5.OceanWaveS GmbHLüneburgGermany

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