Quantification of denitrification in permeable sediments: Insights from a two-dimensional simulation analysis and experimental data

PLM Cook, Frank Wenzhofer, S Rysgaard, OS Galaktionov, FJR Meysman, Bradley D Eyre, J Cornwell, M Huettel, Ronnie Glud

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Using a two-dimensional simulation analysis, we investigated the effects of sediment flushing on denitrification and the implications for two methods commonly used to measure denitrification in intact sediment cores: the N-2:Ar-ratio method and isotope pairing technique (IPT). Our simulations of experimental chamber incubations showed that advective flushing of the sediment can significantly increase sediment denitrification driven by NO3- from the water column (up to a factor of 5), but that nitrification and coupled nitrification-denitrification is reduced under conditions of sediment flushing (up to a factor of 6). N-2 fluxes across SWI may differ significantly from actual rates of denitrification for periods lasting from 1 up to more than 5 d after changes in parameters such as sediment flushing rate and water column NO3- concentrations. Simulations of the isotope pairing technique, showed that the rate of labeled N-2 production, after the addition of (NO3-)-N-15 may take up to similar to 24 h to reach steady state, depending on NO3- concentrations in the water column and sediment flushing rate. Measurements of denitrification in sand using IPT confirmed that short term incubations (11 h) underestimated the actual denitrification. Furthermore, model simulations were able to give a good estimate of measured N-2 fluxes across SWI at different flushing rates under non-steady state conditions, confirming the ability of the model to realistically simulate experimental situations.
Original languageEnglish
Pages (from-to)294-307
Number of pages14
JournalLIMNOL OCEANOGR-METHODS
Issue number4
Publication statusPublished - 2006

Keywords

  • SURFACE SEDIMENTS
  • BURROW VENTILATION
  • EARLY DIAGENESIS
  • REACTIVE TRANSPORT
  • STIRRED BENTHIC CHAMBERS
  • ADVECTIVE TRANSPORT
  • CONTINENTAL-SHELF
  • ISOTOPE-PAIRING METHOD
  • Limnology
  • Oceanography
  • MARINE-SEDIMENTS
  • PORE-WATER EXCHANGE

Fingerprint Dive into the research topics of 'Quantification of denitrification in permeable sediments: Insights from a two-dimensional simulation analysis and experimental data'. Together they form a unique fingerprint.

  • Cite this

    Cook, PLM., Wenzhofer, F., Rysgaard, S., Galaktionov, OS., Meysman, FJR., Eyre, B. D., Cornwell, J., Huettel, M., & Glud, R. (2006). Quantification of denitrification in permeable sediments: Insights from a two-dimensional simulation analysis and experimental data. LIMNOL OCEANOGR-METHODS, (4), 294-307.