A5006041950- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Marine and environmental studies
- Coastal and Marine Management
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Fish Ecology and Management Studies
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Coral and Marine Ecosystems Studies
- Ocean Waves and Remote Sensing
- Arctic and Antarctic ice dynamics
- Mercury impact and mitigation studies
- Coastal wetland ecosystem dynamics
- Wind Energy Research and Development
- Atmospheric and Environmental Gas Dynamics
- Aquatic and Environmental Studies
- Tropical and Extratropical Cyclones Research
- Maritime Transport Emissions and Efficiency
- demographic modeling and climate adaptation
- Species Distribution and Climate Change
Helmholtz-Zentrum Hereon
2017-2024
Philips (United Kingdom)
2020-2021
University of Strathclyde
2020
University of St Andrews
2020
Nansen Environmental and Remote Sensing Center
2014-2019
Uni Research (Norway)
2014-2017
Nansen International Environmental and Remote Sensing Center
2016
University of Bergen
2010-2015
Naval Postgraduate School
2015
Bjerknes Centre for Climate Research
2011-2015
Abstract Ocean warming can modify the ecophysiology and distribution of marine organisms, relationships between species, with nonlinear interactions ecosystem components potentially resulting in trophic amplification. Trophic amplification (or attenuation) describe propagation a hydroclimatic signal up food web, causing magnification depression) biomass values along one or more pathways. We have employed 3‐D coupled physical‐biogeochemical models to explore responses climate change focus on...
Abstract There is growing interest in models of marine ecosystems that deal with the effects climate change through higher trophic levels. Such end‐to‐end combine physicochemical oceanographic descriptors and organisms ranging from microbes to higher‐trophic‐level (HTL) organisms, including humans, a single modeling framework. The demand for such approaches arises need quantitative tools ecosystem‐based management, particularly can bottom‐up top‐down controls operate simultaneously vary time...
Regional seas are potentially highly vulnerable to climate change, yet the most directly societally important regions of marine environment. The combination widely varying conditions mixing, forcing, geography (coastline and bathymetry) exposure open-ocean makes these subject a wide range physical processes that mediates how large scale change impacts on seas' ecosystems. In this paper we explore response five regional sea areas potential future acting via atmospheric, oceanic terrestrial...
Abstract The wind wake effect of offshore farms affects the hydrodynamical conditions in ocean, which has been hypothesized to impact marine primary production. So far only little is known about ecosystem response wakes under premisses large farm clusters. Here we show, via numerical modeling, that associated North Sea provoke large-scale changes annual production with local up ±10% not at clusters, but also distributed over a wider region. model projects an increase sediment carbon deeper...
The potential impact of offshore wind farms through decreasing sea surface speed on the shear forcing and its consequences for ocean dynamics are investigated. Based unstructured-grid model SCHISM, we present a new cross-scale hydrodynamic setup southern North Sea, which enables high-resolution analysis in marine environment. We introduce an observational-based empirical approach to parameterize atmospheric wakes simulate seasonal cycle summer stratification consideration recent state farm...
The aphorism, ‘All models are wrong, but some useful’, originally referred to statistical models, is now used for scientific in general. When presenting results from a marine simulation model, this statement effectively stops discussions about the quality of as there always another observation mismatch, and thereby confirmation why model cannot be trusted. It common that observations less challenged often viewed ‘gold standard’ judging whereas proper interpretations true value overlooked....
A novel pan-European marine model ensemble was established, covering nearly all seas under the regulation of Marine Strategy Framework Directive (MSFD), with aim providing a consistent assessment potential impacts riverine nutrient reduction scenarios on eutrophication indicators. For each sea region, up to five coupled biogeochemical models from institutes over Europe were brought together for first time. All systems followed harmonised scenario approach and ran two simulations, which...
Structure drag from offshore wind turbines and its physical impacts on the marine environment of German Bight are investigated in this study. The flow past vertical cylinders, such as turbine foundations, associated turbulent mixing has long been studied, but questions remain about anticipated regional implications infrastructure biogeochemical conditions. Here, we present two existing modeling approaches for simulating foundation effects ocean models discuss problematic use very high...
Abstract. The simultaneous occurrence of extreme events gained more and attention from scientific research in the last couple years. Compared to single events, co-occurring or compound extremes may substantially increase risks. To adequately address such risks, improving our understanding flood Europe is necessary requires reliable estimates their probability together with potential future changes. In this study northern central were studied using a Monte Carlo-based approach that avoids use...
Abstract To investigate the impact of changing environmental conditions in North Sea on distribution and survival early life stages a marine fish species, we employed suite coupled model components: (i) an Eulerian hydrodynamic/ecosystem (Nutrients, Phyto‐, Zooplankton, Detritus) to provide both 3‐D fields hydrographical properties, spatially temporally variable prey fields; (ii) Lagrangian transport simulate temporal changes cohort distribution; (iii) individual‐based (IBM) depict foraging,...
We employed a suite of coupled models to estimate the influence environmental variability in North Sea on early life stages sprat ( Sprattus sprattus ), small pelagic clupeid, and Atlantic cod Gadus morhua demersal gadoid. Environmentally driven changes bottom-up processes were projected impact survival growth eggs larvae these marine fish species markedly different ways. utilized spatially explicit, individual-based model (IBM) larval 3D ecosystem (ECOSMO) provide variable prey fields. The...
Abstract. The depletion of sedimentary organic carbon stocks by the use bottom-contacting fishing gear and potential climate impacts resulting from remineralization to CO2 have recently been heavily debated. An issue that has remained unaddressed thus far regards fate resuspended into water column following disturbance gear. To resolve this, a 3D-coupled numerical ocean sediment macrobenthos model is used in this study quantify bottom trawling on North Sea sediments. Using available...
Abstract Bottom trawling represents the most widespread anthropogenic physical disturbance to seafloor sediments on continental shelves. While trawling-induced changes benthic ecology have been widely recognized, impacts long-term organic carbon storage in marine remains uncertain. Here we combined datasets of sediment and bottom for a heavily trawled region, North Sea, explore their potential mutual dependency. A pattern emerges when comparing surface carbon-to-mud ratio with intensity...
Variations in the elemental ratios of carbon, nitrogen, and phosphorus marine organic matter (OM) their influence on carbon cycling remain uncertain both open coastal oceans. While observations consistently show enrichment depletion relative to Redfield ratios, many biogeochemical models assume fixed stoichiometry. As a result, they often underestimate biological fixation, limiting ability accurately represent fluxes. Here, we provide comprehensive assessment effects variable OM...
This study demonstrates a proof of concept for two-way coupling between generic higher-trophic-level (HTL) biomass models —fish and macrobenthos— three lower-trophic-level (LTL) used by Copernicus Marine Services. The ECOSMO E2E model is functional group type ecosystem with fish macrobenthos within standard NPZD (nutrient–phytoplankton–zooplankton–detritus) framework. By reprogramming into independent modules (ECOSMO-E2E v2.0), we can now...
As global warming progresses, sedimentary carbon sinks are becoming increasingly important in climate change mitigation measures. Thus, there is a need for in-depth knowledge of both the dynamics and vulnerabilities sinks, as well legal political options to protect restore their natural sequestration efficiency. Here, we report on transdisciplinary research project APOC, which addressed Anthropogenic impacts cycling Particulate Organic Carbon North Sea. Important results include...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 347:221-232 (2007) - DOI: https://doi.org/10.3354/meps06980 Hydrodynamic backtracking of fish larvae by individual-based modelling Asbjørn Christensen1,*, Ute Daewel2, Henrik Jensen1, Mosegaard1, Mike St. John2, Corinna Schrum1,3 1Danish Institute Fisheries Research (DIFRES), Charlottenlund Slot, 2920...
Predicting fish stock variations on interannual to decadal time scales is one of the major issues in fisheries science and management. Although field marine ecological predictions still its infancy, it understood that a source multi-year predictability resides ocean. Here we show first highly skilful long-term commercially valuable Barents Sea cod stock. The 7-year are based propagation ocean temperature anomalies from subpolar North Atlantic toward Sea, strong co-variability between these...
The Elbe estuary is a substantially engineered tidal water body that receives high loads of organic matter from the eutrophied river. entering at weir dominated by diatom populations collapse in deepened freshwater reach. Although estuary’s reach considered to manifest vertically homogenous density distribution (i.e., be well-mixed), several indicators like trapping particulate matter, near-bottom oxygen depletion and ammonium accumulation suggest vertical exchange particles dissolved...
High biological productivity and the efficient export of carbon-enriched subsurface waters to open ocean via continental shelf pump mechanism make mid-latitude shelves like northwest European (NWES) significant sinks for atmospheric CO 2 . Tidal forcing, as one regionally dominant physical forcing mechanisms, regulates mixing-stratification status water column that acts a major control on NWES. Because complexity system spatial heterogeneity tidal impacts, there still are large knowledge...
Abstract. Here we present results from a long-term model simulation of the 3-D coupled ecosystem ECOSMO II for North Sea and Baltic set-up. The allows both multi-decadal hindcast marine system specific process studies under controlled environmental conditions. Model have been analysed with respect to variability in physical biological parameters help empirical orthogonal function (EOF) analysis. analysis 61-year (1948–2008) reveals quasi-decadal variation salinity, temperature current fields...