A5080737384- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Fecal contamination and water quality
- Hydrocarbon exploration and reservoir analysis
- Soil and Water Nutrient Dynamics
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Urban Stormwater Management Solutions
- Water Treatment and Disinfection
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Air Quality and Health Impacts
- Marine and fisheries research
- Geochemistry and Geologic Mapping
- Wastewater Treatment and Reuse
- Spectroscopy and Laser Applications
- Marine Bivalve and Aquaculture Studies
- Arctic and Antarctic ice dynamics
- Geological formations and processes
- Microbial Community Ecology and Physiology
- Wind and Air Flow Studies
- Atmospheric chemistry and aerosols
- Oceanographic and Atmospheric Processes
- Historical Studies of British Isles
- Evolutionary Psychology and Human Behavior
Northumbria University
2025
University of Koblenz and Landau
2015-2020
Universität Koblenz
2016-2020
Cawthron Institute
2007-2009
Aberystwyth University
2004-2008
University of Wales
2004-2008
Flinders University
2003-2006
Flinders Medical Centre
2003
University of South Australia
2003
Institute of Hydrology of the Slovak Academy of Sciences
1995
Methane (CH4) strongly contributes to observed global warming. As natural CH4 emissions mainly originate from wet ecosystems, it is important unravel how climate change may affect these emissions. This especially true for ebullition (bubble flux sediments), a pathway that has long been underestimated but generally dominates Here we show remarkably strong relationship between and temperature across wide range of freshwater ecosystems on different continents using multi-seasonal data the...
Parallel policy developments driven in the USA by Clean Water Act and Europe Framework Directive have focused attention on need for quantitative information fluxes of faecal indicator bacteria catchment systems. Data are required point diffuse source loadings, fate transport these non-conservative parameters, land surface, within soil systems, groundwater, streams, impoundments nearshore waters. This new is needed regulators to inform Total Maximum Daily Load estimates Programmes Measures...
Laboratory sediment incubations and continuous ebullition monitoring over an annual cycle in the temperate Saar River, Germany confirm that impounded river zones can produce emit methane at high rates (7 to 30 (g CH4 m–3 d–1) 25 °C 270 700 m–2 yr–1), respectively). Summer (ME) peaks were a factor of 4 10 times winter minima, formation was dominated by upper (depths 0.14 0.2 m). The key driver seasonal ME dynamics temperature. An empirical model relating temperature depth, derived from...
Abstract Ebullition is an important pathway for methane emission from inland waters. However, the mechanisms controlling bubble formation and release in aquatic sediments remain unclear. A laboratory incubation experiment was conducted to investigate dynamics of formation, storage, response hydrostatic head drops three different types natural sediment. Homogenized clayey, silty, sandy (initially quasi‐uniform through depth columns) were incubated chambers 3 weeks. We observed distinct stages...
Methane bubble formation and transport is an important component of biogeochemical carbon cycling in aquatic sediments. To improve understanding how sediment mechanical properties influence growth freshwater sediments, a 20-day laboratory incubation experiment using homogenized natural clay sand was performed. development at high resolution characterized by μCT. Initially, capillary invasion microbubbles (<0.1 mm) dominated formation, with continued gas production (4 days for clay; 8 sand),...
Abstract Emissions of the potent greenhouse gas methane (CH 4 ) from streams and rivers are a significant component global freshwater emissions. The distribution CH production oxidation within stream sections in vertical sediment profiles is not well understood, environmental controls on emission such systems create challenge for assessing larger‐scale dynamics. Here we investigate factors driving spatial variability potential (PMP) (PMO) temperate network Germany. PMP was highly variable,...
The use of cavity ring-down spectrometer (CRDS) based portable greenhouse gas analyzers (PGAs) in closed-loop configuration to measure small sample volumes (< 1 l) for CH4 and CO2 concentrations is increasing offers certain advantages over conventional measurement methods terms speed as well the ability directly field locations. This first systematic assessment uncertainties, problems issues associated with achieving reliable repeatable this technique presents adaptation, range, calibration...
Abstract Management of the effects water quality and flow on fisheries requires an understanding factors that control fish movements. We used radiotelemetry to monitor movements adult brown trout Salmo trutta in a New Zealand river over 11 months (September 2004 August 2006) linked those changes temperature. Individual moved up 41 km during study. However, most less than 1 km. All showed little movement throughout summer were living relatively deep pools presumably provided cover. The rates...
Background. There were four purposes of the current study, including investigation the: ( i ) adequacy a multidimensional measure body image; ii genetic and environmental epidemiology this measure; iii shared variance between risk factors for mass index (BMI) iv Equal Environment Assumption (EEA) as it related to attitudes. Method. Six types attitudes, measured by Body Attitudes Questionnaire (BAQ) reported 894 complete female–female twin pairs (mean age 32·35 years, S . D .=41·8) from...
1. SERCON is a technique for assessing the conservation value of rivers in terms criteria such as naturalness, physical diversity and species richness. Part process involves gathering information on features their corridors, which accurate survey data are essential. 2. has been developed parallel with River Habitat Survey (RHS), method compiling an inventory classifying habitat quality based surveys discrete river reaches. 3. A study was carried out to compare scores derived from RHS those...