Gao, H. et al. (2012) Intensive and extensive nitrogen loss from intertidal permeable sediments of the Wadden Sea. Limnology and Oceanography, 57(1), pp. 185-198. (doi: 10.4319/lo.2012.57.1.0185)
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Abstract
Nitrogen (N) loss rates were determined in permeable sediments of the Wadden Sea using a combination of stable N isotope incubation experiments and model simulation approaches during three seasons. Three different incubation methods that employed the isotope pairing technique were used: intact core incubations simulating either (1) diffusive or (2) advective transport conditions and (3) slurry incubations. N loss rates from core incubations under simulated advective transport conditions exceeded those rates measured under diffusive transport conditions by 1-2 orders of magnitude, but were comparable to those observed in slurry incubations. N loss rates generally showed little seasonal and spatial variation (207 ± 30 µmol m-2 h-1) in autumn 2006 and spring and summer 2007. Utilizing an extensive time series of nutrient concentrations and current velocities obtained from a continuous monitoring station, nitrate and nitrite (i.e., NO−x) flux into the sediment was modeled over a full annual cycle. Fluxes were sufficient to support the experimentally derived N loss rates. Combining the measured rates with the modeled results, an annual N removal rate of 745 ± 109 mmol N m-;2 yr-1 was estimated for permeable sediments of the Wadden Sea. This rate agrees well with previous N loss estimates for the Wadden Sea based on N budget calculations. Permeable sediments, accounting for 58-70% of the continental shelf area, are an important N sink and their contribution to the global N loss budget should be reevaluated.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Collins, Dr Gavin |
Authors: | Gao, H., Matyka, M., Liu, B., Khalili, A., Kostka, J.E., Collins, G., Jansen, S., Holtappels, M., Jensen, M.M., Badewien, T.H., Beck, M., Grunwald, M., de Beer, D., Lavik, G., and Kuypers, M.M.M. |
College/School: | College of Science and Engineering > School of Engineering > Infrastructure and Environment |
Journal Name: | Limnology and Oceanography |
Publisher: | American Society of Limnology and Oceanography, Inc. |
ISSN: | 0024-3590 |
ISSN (Online): | 1939-5590 |
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