A5001172642- Oceanographic and Atmospheric Processes
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Marine and fisheries research
- Coral and Marine Ecosystems Studies
- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Microplastics and Plastic Pollution
- Geology and Paleoclimatology Research
- Fish Ecology and Management Studies
- Isotope Analysis in Ecology
- Soil and Water Nutrient Dynamics
- Polar Research and Ecology
- Ocean Acidification Effects and Responses
- earthquake and tectonic studies
- Underwater Acoustics Research
- Hydrocarbon exploration and reservoir analysis
- Geological and Geochemical Analysis
- Water Quality and Pollution Assessment
- Aeolian processes and effects
- Arctic and Antarctic ice dynamics
- Air Quality Monitoring and Forecasting
- Geological formations and processes
University of Koblenz and Landau
2020-2024
University of Kaiserslautern
2023-2024
Federal Institute of Hydrology
2024
Universität Koblenz
2020-2023
Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
2023
University of Southern Denmark
2016-2022
Scottish Association For Marine Science
2015-2018
GEOMAR Helmholtz Centre for Ocean Research Kiel
2009-2016
Swiss Federal Institute of Aquatic Science and Technology
2009
Headwater streams are natural sources of methane but suffering severe anthropogenic disturbance, particularly land use change and climate warming. The widespread intensification agriculture since the 1940s has increased export fine sediments from to streams, systematic assessment their effects on stream is lacking. Here we show that excess sediment delivery in UK (n = 236) and, set against a pre-1940s baseline, markedly streambed organic matter (23 100 g m-2), amplified production ultimately...
[1] A natural carbon dioxide (CO2) seep was discovered during an expedition to the southern German North Sea (October 2008). Elevated CO2 levels of ∼10–20 times above background were detected in seawater a salt dome ∼30 km north East-Frisian Island Juist. single elevated value 53 higher than measured, indicating possible point source from seafloor. Measured pH values around 6.8 support modeled for observed high concentration. These results are presented context seepage detection, light...
The aquatic application of the eddy correlation (EC) technique is growing more popular and gradually becoming a standard method for resolving benthic O 2 fluxes. By including effects local hydrodynamics, EC provides greater insight into nature exchange than traditional methods (i.e., chambers lander microprofilers). popularity has led to demand easily accessible robust instrumentation. Currently, instrumentation limited two commercially available systems that are still in development stage....
We report on newly discovered mud volcanoes located at ~4500 m water depth ~90 km west of the deformation front accretionary wedge Gulf Cadiz, and thus outside their typical geotectonic environment.Seismic data suggest that fluid flow is mediated by a >400-km-long strike-slip fault marking transcurrent plate boundary between Africa Eurasia.Geochemical (Cl, B, Sr, 87 Sr/ 86 δ 18 O, δD) reveal fluids originate in oceanic crust older than 140 Ma.On rise to surface, these receive strong...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 525:97-104 (2015) - DOI: https://doi.org/10.3354/meps11211 Benthic O2 uptake of two cold-water coral communities estimated with non-invasive eddy correlation technique Lorenzo Rovelli1,*, Karl M. Attard2,3, Lee D. Bryant4,8, Sascha Flögel4, Henrik Stahl1,9, J. Murray Roberts1,5,6, Peter Linke4, Ronnie N....
Abstract Small headwater streams are recognized for intense outgassing to the atmosphere of climate‐relevant carbon dioxide (CO 2 ) and methane (CH 4 ). Though these headwaters markedly oversaturated both CO CH , origins controls over fate two carbon‐gases still poorly constrained, especially stronger greenhouse gas . Here, by measuring stream‐based production concurrently with their rates atmosphere, we identify distinct biophysical control mechanisms each gas. We show that while is largely...
Cold-water coral (CWC) reefs are distributed globally and form complex three-dimensional structures on the deep seafloor, providing habitat for numerous species. Here, we measured community O2 dissolved inorganic nitrogen (DIN) flux of CWC reef habitats with different cover bare sediment (acting as reference site) in Logachev Mound area (NE Atlantic). Two methodologies were applied: non-invasive situ aquatic eddy co-variance (AEC) technique, ex whole box core (BC) incubations. The AEC system...
Abstract Prediction of the complex cyanobacteria-environment interactions is vital for understanding harmful bloom formation. Most previous studies on these considered specific properties cyanobacterial cells as representative entire population (e.g. growth rate, mortality, and photosynthetic capacity (Pmax)), assumed that they remained spatiotemporally unchanged. Although, at level, alteration such traits can be driven by intraspecific competition, little known about how their plasticity...
Due to climate change, Microcystis blooms occur at increasing frequencies in aquatic ecosystems worldwide. Wind-generated turbulence is a crucial environmental stressor that can vertically disperse the surface scum, reducing its light availability. Yet, interactions of scum with wind-generated hydrodynamic processes, particularly those air-water interface, remain poorly understood. Here, we explore response (including colony size and migration dynamics) varying magnitudes durations...
Organic carbon drives key processes in estuaries and rivers like (micro)biological production, oxygen consumption, transport of pollutants, the flocculation/agglomeration suspended particulate matter. The OrgCarbon project aims for an in‑depth characterization organic field samples by using both established innovative methods. Oxygen microbial respiration, potential sorption origin composition matter will be determined. By testing a variety cross-disciplinary methods, we aim to...
Abstract This study presents a novel approach resulting in the first cold-water coral reef biomass maps, used to assess associated ecosystem functions, such as carbon (C) stock and turnover. We focussed on two dominant engineers at Mingulay Reef Complex, Lophelia pertusa (rubble, live dead framework) sponge Spongosorites coralliophaga . Firstly, from combining biological (high-definition video, collected specimens), environmental (extracted multibeam bathymetry) function (oxygen consumption...
Dredging of the fairway in Ems estuary was driven by need to accommodate increasing draft ships. This modification has had negative effects on sediment balance and ecology estuary. The deepening results strong alterations tidal dynamics, such as amplitude duration, well hydrodynamics current velocity turbulence. increased fine input, which, at high suspended concentrations, contributes formation fluid mud—a mixture silt, clay, organic matter. dynamics mud, particularly differences...
Despite advances in understanding methane dynamics dry inland waters, the potential of riverbeds to act as sinks methane, soils do, and controlling factors remain unclear. Here, we tested three main oxidation freshwater ecosystems sediments from a riverbed (decreasing modulation degree): gravimetric water content (GWC), temperature, light quality intensity. We measured rates (PMO) along gradient GWC (1%, 5%, 8%, 10%, 100%), temperature (10 ºC, 20 30 ºC) (in darkness, at...
Intrinsically floating microplastics (MP) such as polyethene (PE) or polypropylene (PP) are among the most common MPs found in aquatic sediments. There must hence be mechanisms that cause lighter-than-water to deposit despite them being buoyant. How these end up sediment bed is only partly understood. This study explores how turbulence water can affect vertical movement of buoyant MP and bring contact with bed. The deposition PE (995 kg m-3) slow-flowing (average flow velocities 1.85 4.17 cm...
We investigated the seasonal dynamics of in-stream metabolism at reach scale (∼ 150 m) headwaters across contrasting geological sub-catchments: clay, Greensand, and Chalk upper River Avon (UK). Benthic metabolic activity was quantified by aquatic eddy co-variance while water column assessed bottle incubations. Seasonal reaches were specific for three types geologies. During spring, all net autotrophic, with rates up to 290 mmol C m-2 d-1 in clay reach. remaining seasons, Greensand...
Rocky benthic communities are common in Antarctic coastal habitats; yet little is known about their carbon turnover rates. Here, we performed a broad survey of shallow ( < 65 m depth) rocky ice-scoured habitats South Bay (Doumer Island, Western Peninsula), combining (i) biodiversity assessments from imaging, and (ii) situ dissolved oxygen (O2) exchange rates quantified by the aquatic eddy covariance technique. The 18 study sites revealed gradual transition macroalgae coralline-dominated at...
Cold-water corals (CWCs) thrive in areas with complex and rough topography favoring the development of highly diverse benthic communities. Several biotic abiotic factors including organic matter supply, temperature, bottom roughness currents are important drivers ecosystem structure functioning deep-sea environments at different spatial temporal scales. Little is known, however, how basin-scale changes ocean climate affect these local Here, we use high-resolution implementations hydrodynamic...
Abstract. In recent decades, the central North Sea has been experiencing a general trend of decreasing dissolved oxygen (O2) levels during summer. To understand potential causes driving lower O2, we investigated 3-day period summertime turbulence and O2 dynamics in thermocline bottom boundary layer (BBL). The study focuses on coupling biogeochemical with physical transport processes to identify key drivers organic carbon turnover within BBL. Combining our flux observations an analytical...
Gas fluxes from aquatic ecosystems are a significant component of the carbon cycle. exchange across air-water interface is regulated by near-surface turbulence and can be controlled different atmospheric forcing conditions, with wind speed surface buoyancy flux being most recognized drivers in empirical studies modeling approaches. The effect rainfall on has rarely been studied consistent relationship between rain rate not yet established. In this study, we addressed some limitations still...
Artificial channels, common features of inland waters, have been suggested as significant contributors to methane (CH4) and carbon dioxide (CO2) dynamics emissions; however, the magnitude drivers their CH4 CO2 emissions (diffusive ebullitive) remain unclear. They are characterized by reduced flow compared donor river, which results in suspended organic matter (OM) accumulation. We propose that such systems hydrological controls will be OM accumulation control promoting production outgassing....
Sea-ice ecosystems are among the most extensive of Earth’s habitats; yet its autotrophic and heterotrophic activities remain poorly constrained. We employed in situ aquatic eddy-covariance (AEC) O2 flux method laboratory incubation techniques (H14CO3−, [3H] thymidine leucine) to assess productivity Arctic sea-ice using different methods, conditions ranging from land-fast ice during winter, pack within central Ocean summer. Laboratory tracer measurements resolved rates bacterial C demand...
Abstract Headwater streams are important in the carbon cycle and there is a need to better parametrize quantify exchange of carbon‐relevant gases. Thus, we characterized variability gas coefficient ( k 2 ) dissolved oxygen (O transfer velocity two lowland headwaters River Avon (UK). The traditional one‐station open‐water method was complemented by situ quantification riverine sources sinks O (i.e., groundwater inflow, photosynthesis, respiration both water column benthic compartment)...