Quantifying tidally-driven benthic oxygen exchange across permeable sediments: An aquatic eddy correlation study.

McGinnis, Daniel, Sommer, Stefan, Lorke, Andreas, Glud, Ronnie N. and Linke, Peter (2014) Quantifying tidally-driven benthic oxygen exchange across permeable sediments: An aquatic eddy correlation study. Open Access Journal of Geophysical Research: Oceans, 119 (10). pp. 6918-6932. DOI 10.1002/2014JC010303.

[img]
Preview
Text
McGinnis et.al.pdf - Published Version
Available under License Creative Commons: Attribution 3.0.

Download (1475Kb) | Preview

Supplementary data:

Abstract

Continental shelves are predominately (~70%) covered with permeable, sandy sediments.
While identified as critical sites for intense oxygen, carbon, and nutrient turnover, constituent exchange across permeable sediments remains poorly quantified. The central North Sea largely consists of permeable sediments and has been identified as increasingly at risk for developing hypoxia. Therefore, we investigate
the benthic O2 exchange across the permeable North Sea sediments using a combination of in situ microprofiles, a benthic chamber, and aquatic eddy correlation. Tidal bottom currents drive the variable sediment O2 penetration depth (from ~3 to 8 mm) and the concurrent turbulence-driven 25-fold variation in the benthic sediment O2 uptake. The O2 flux and variability were reproduced using a simple 1-D model linking
the benthic turbulence to the sediment pore water exchange. The high O2 flux variability results from deeper sediment O2 penetration depths and increased O2 storage during high velocities, which is then utilized during low-flow periods. The study reveals that the benthic hydrodynamics, sediment permeability,
and pore water redox oscillations are all intimately linked and crucial parameters determining the oxygen availability. These parameters must all be considered when evaluating mineralization pathways of organic
matter and nutrients in permeable sediments.

Document Type: Article
Additional Information: WOS:000345499700023
Keywords: Eddy-correlation, permeable sediments, benthic oxygen exchange, turbulence, North Sea, CE09013, ROV Kiel 6000, R/V Celtic Explorer
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R07
OceanRep > The Future Ocean - Cluster of Excellence > FO-R05
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2014JC010303
ISSN: 2169-9275
Projects: Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 27 Aug 2014 06:37
Last Modified: 26 Feb 2018 12:51
URI: http://oceanrep.geomar.de/id/eprint/25492

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...