We present and compare small sediment‐water fluxes of O 2 determined with the eddy correlation technique, in situ chambers, from vertical sediment microprofiles at a 1450 m deep‐ocean site Sagami Bay, Japan. The average uptake for three approaches, respectively, was 1.62 ± 0.23 (SE, n = 7), 1.65 0.33 ( 2), 1.43 0.15 25) mmol −2 d −1 . very good agreement between flux chamber serves as new, important validation technique. It demonstrates that instrumentation available today is precise can...

Dissolved oxygen (DO) fluxes were measured by eddy correlation to estimate net ecosystem metabolism (NEM) during summer in a restored eelgrass (Zostera marina) meadow and nearby, unvegetated sediment. This technique measures benthic under true situ light hydrodynamic conditions, integrates over large area (typically > 100 m 2 ), captures short‐term variations. DO through eight 24‐h periods showed pronounced temporal variation driven local hydrodynamics on multiple scales: hour‐to‐hour,...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 417:1-12 (2010) - DOI: https://doi.org/10.3354/meps08795 FEATURE ARTICLE Benthic O2 exchange across hard-bottom substrates quantified by eddy correlation in a sub-Arctic fjord Ronnie N. Glud1,2,3,*, Peter Berg4, Andrew Hume1,4, Paul Batty2, Martin E. Blicher2, Kunuk Lennert2, Søren Rysgaard2 1Scottish...

Abstract Eddy correlation (EC) measurements in the benthic boundary layer (BBL) allow estimating O 2 uptake from a point distant to sediment surface. This noninvasive approach has clear advantages as it does not disturb natural hydrodynamic conditions, integrates flux over large foot‐print area and allows many repetitive measurements. A drawback is, however, that measured bottom water is necessarily equal across sediment‐water interface. fundamental assumption of EC technique mean current...

Lay Abstract The Eastern oyster, Crassostrea virginica , often forms intertidal reefs composed of dense assemblages oysters. Because their suspension feeding, oysters clear large quantities particulate matter from the water column, removing not only phytoplankton but also suspended sediment. In addition, because metabolic requirements, can utilize substantial oxygen. An oyster reef was monitored to quantify processes affecting flow, sediment deposition and erosion, exchange oxygen reef. At...

Based on in situ microprofiles, chamber incubations and eddy covariance measurements, we investigated the benthic carbon mineralization nutrient regeneration a ~65-m-deep sedimentation basin of Loch Etive, UK. The sediment hosted considerable amount infauna that was dominated by brittle star A. filiformis. numerous burrows were intensively irrigated enhancing O2 uptake ~50 %, inducing highly variable redox conditions distribution surface as also documented complementary laboratory-based...

A low‐cost self‐contained underwater particle image velocimetry (UWPIV) system has been developed to measure small‐scale turbulent flow structures in situ. The UWPIV employs a compact continuous‐wave laser and an optical scanner deliver light sheet that illuminates naturally occurring particles. Particle images are taken by CCD camera along with ultra‐compact PC. nontethered design can be fit two small housings all components powered batteries: ideal for variety of situ deployments....

Three approaches, Eddy Correlation (EC), Turbulent Kinetic Energy (TKE), and Inertial Dissipation (ID) methods, were compared to evaluate their potential for estimation of friction velocity in a Scottish sea loch. As an independent assessment parameter, we used simultaneous O 2 recordings the diffusive boundary layer (DBL) that with theoretical distribution as derived from respective estimates. Friction velocities calculated based on three approaches using continuously measured turbulent...

International development country classifications are important for achieving goals by directing differential support to a group of countries facing common constraints. The small island developing States (SIDS) classification is widely used supporting nations. Some nations now self-identifying as "large ocean states" (LOS), citing the central role their development. Here we show need new ocean-based LOS highlighting limitations current classifications. We analyze this further enumerating 15...

Abstract Rising ocean temperatures threaten marine ecosystems and food security worldwide. Yet, our current understanding of how climate change affects global fisheries often overlooks critical seasonal dynamics that govern ecosystem function. To address this gap, we compiled a dataset for 187 countries between 1950 to 2018 employed fixed effects regression assess the effect intra-annual sea surface temperature (SST) variation on annual catches. We detect significant non-linear response with...

Major advances in base technologies of computer processors and low cost communications have paved the way for a resurgence interest unattended ground sensors. Networks sensors offer potential persistent surveillance capability any area that sensor network can be placed. Key to this is choice on each node. If system randomly deployed then nonline sight become necessity. Acoustic potentially greatest level will considered here. As passive sensor, only time arrival or bearing information...

This work describes the development of a tool that predicts coverage and performance sensor networks. Specifically it examines weapon locating radars acoustic sensors in different terrain weather conditions. The computer environment multiple models are presented. Fusion takes predicted accuracy metrics from single combines them to show networked performance. Calculations include Cramer-Rao lower bound computation fused sensors' source location error. Results presented showing outputs form...

In response to the needs of UK MOD QinetiQ have designed, developed and trialled an ad-hoc, self organising network acoustic nodes for in-depth deployment that can detect track military targets in a range environments all types weapon locating. Research conducted has shown disposable technologies are sufficiently mature provide useful capability. Work this year included 3 month series trials exercise prototype equipment provided indication in-service capability across broad environments....