Matthew J. Cohen
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View article: Centennial changes in forest cover and water yield in a flatwoods watershed
Centennial changes in forest cover and water yield in a flatwoods watershed Open
Forest cover has changed globally over the last century, with important impacts on catchment hydrological function. To better quantify changes in forest density, we integrated in-situ leaf area index (LAI) measurements, historical aerial i…
View article: Sampling Regime Effects on Detecting Spatial Stability of Water Quality
Sampling Regime Effects on Detecting Spatial Stability of Water Quality Open
Protecting surface water quality can be complicated by high spatiotemporal variability. Pollutant sources and transport pathways may be identified through sufficiently high‐density monitoring sites and high‐frequency sampling, but practica…
View article: A decision support tool for predicting water yield in North Florida forests
A decision support tool for predicting water yield in North Florida forests Open
We present a geospatial decision support tool for predicting water yield (precipitation minus evapotranspiration) impacts of forest management strategies across North Florida. Our tool assembles geographic data layers on forest structure, …
View article: Spatial and Temporal Variability of River Water Quality
Spatial and Temporal Variability of River Water Quality Open
The deterioration of stream water quality threatens ecosystems and human water security worldwide. Effective risk assessment and mitigation requires spatial and temporal data from water quality monitoring networks (WQMNs). However, it rema…
View article: ChemLotUS: A Benchmark Data Set of Lotic Chemistry Across US River Networks
ChemLotUS: A Benchmark Data Set of Lotic Chemistry Across US River Networks Open
We present a curated water chemistry data set for lotic systems across the contiguous US containing 35,000,000 records from 290,000 locations. These records are spatially joined to high‐resolution national hydrography data sets, providing …
View article: Nutrient Limitation Induces a Productivity Decline From Light‐Controlled Maximum
Nutrient Limitation Induces a Productivity Decline From Light‐Controlled Maximum Open
Nutrient impacts on productivity in stream ecosystems can be obscured by light limitation imposed by canopy cover and water turbidity, thereby creating uncertainties in linking nutrient and productivity regimes. Evaluations of nutrient lim…
View article: Controls of space-time variance of water chemistry in river networks
Controls of space-time variance of water chemistry in river networks Open
River water quality is essential for ecosystem function and human well-being, yet anthropogenic impacts, such as pollutant input from agricultural activities or waste water, threaten water resources. An effective design of water quality mo…
View article: Spatial variability and temporal changes in inter-catchment groundwater flow across the contiguous United States
Spatial variability and temporal changes in inter-catchment groundwater flow across the contiguous United States Open
The assumption of a closed water balance in catchments is central to many hydrological applications. However, emerging evidence suggests that catchments can lose water to surrounding areas, extending their influence beyond topographic boun…
View article: A Simple Model of Flow Reversals in Florida’s Karst Springs
A Simple Model of Flow Reversals in Florida’s Karst Springs Open
North Florida's karst springs are among the largest and most abundant in the world. Despite relatively stable spring discharges, flow reversals can episodically occur in some springs when river waters backflow into the aquifer during flood…
View article: The role of mindfulness in stress, productivity and wellbeing of foundation year doctors: a mixed-methods feasibility study of the mindful resilience and effectiveness training programme
The role of mindfulness in stress, productivity and wellbeing of foundation year doctors: a mixed-methods feasibility study of the mindful resilience and effectiveness training programme Open
Background Medical Foundation Year (FY) doctors demonstrate greater psychological distress compared with the general population and other student groups. This feasibility study investigated FY doctors’ perceptions of mindfulness and the im…
View article: Energy inputs imprint seasonality and fractal structure on river metabolic regimes
Energy inputs imprint seasonality and fractal structure on river metabolic regimes Open
The temporal structures of gross primary production (GPP) and ecosystem respiration (ER) vary across time scales in response to complex interactions among dynamic drivers (e.g., flow, light, temperature, organic matter supply). To explore …
View article: Divergence Between Long‐Term and Event‐Scale Nitrate Export Patterns
Divergence Between Long‐Term and Event‐Scale Nitrate Export Patterns Open
The mechanisms driving catchment nitrogen storage and release operate at multiple spatiotemporal scales. Consequently, analyses grounded in different observational timescales can yield discrepant interpretations of underlying mechanisms. T…
View article: Carbon Cycling and Nutrient Storage in Supraglacial Environments on the western margin of the Greenland Ice sheet
Carbon Cycling and Nutrient Storage in Supraglacial Environments on the western margin of the Greenland Ice sheet Open
During summer, exposed ice on the surface of glaciers becomes weathered by solar radiation, creating a ~1 m water-saturated layer of porous ice referred to as the weathering crust aquifer. Here we present results from a hydrological, bioge…
View article: Patterns of Wetland Hydrologic Connectivity Across Coastal‐Plain Wetlandscapes
Patterns of Wetland Hydrologic Connectivity Across Coastal‐Plain Wetlandscapes Open
Depressional wetlands influence the functions of wetlandscapes by storing and releasing water, providing critical habitat, amplifying carbon and nutrient cycling, and influencing microclimate. Despite persistent subsurface connectivity, de…
View article: Bedrock mediates responses of ecosystem productivity to climate variability
Bedrock mediates responses of ecosystem productivity to climate variability Open
Sensitivity of ecosystem productivity to climate variability is a critical component of ecosystem resilience to climate change. Variation in ecosystem sensitivity is influenced by many variables. Here we investigate the effect of bedrock l…
View article: Scaling up quality-assured psychotherapy: The role of therapist competence on perinatal depression and anxiety outcomes
Scaling up quality-assured psychotherapy: The role of therapist competence on perinatal depression and anxiety outcomes Open
Our study highlights the importance of demonstrating psychological treatment skills through standardized role-plays over knowledge-based competence to predict perinatal patient outcomes. Using well-defined evidence-based tools is critical …
View article: Water Level Data in Coastal Plain Wetlandscapes
Water Level Data in Coastal Plain Wetlandscapes Open
datasets for Lee, Epstein, and Cohen, WRR 2023 (submitted) wetland data.mat / wetland data.xslx: hourly wetland water level data for each wetlandscape that is used to identify surface connectivity threshold, rates of water export via surfa…
View article: Water Level Data in Coastal Plain Wetlandscapes
Water Level Data in Coastal Plain Wetlandscapes Open
datasets for Lee, Epstein, and Cohen, WRR 2023 (submitted) wetland data.mat: hourly wetland water level data for each wetlandscape that is used to identify surface connectivity threshold, rates of water export via surface and subsurface co…
View article: Spatial vs temporal variability in German river water quality
Spatial vs temporal variability in German river water quality Open
River water quality is degraded by a multitude of diffuse and point sources impeding ecosystem functioning and constituting a severe risk for human water security all over the world. Monitoring campaigns are the basis of evaluating water q…
View article: Surprising consistency in event-scale nitrate export patterns across catchments
Surprising consistency in event-scale nitrate export patterns across catchments Open
High nitrate concentrations in groundwater and surface water threaten drinking water quality and the integrity of aquatic ecosystems. Discharge events can play a disproportionate role in nitrate mobilization and transport from source to st…
View article: River Corridor Sources Dominate CO<sub>2</sub> Emissions From a Lowland River Network
River Corridor Sources Dominate CO<sub>2</sub> Emissions From a Lowland River Network Open
Rivers and streams are control points for CO 2 emission to the air ( f CO 2 ), with emission rates often exceeding internal metabolism (net ecosystem production, NEP). The difference is usually attributed to CO 2 ‐supersaturated groundwate…
View article: Extent, patterns, and drivers of hypoxia in the world's streams and rivers
Extent, patterns, and drivers of hypoxia in the world's streams and rivers Open
Hypoxia in coastal waters and lakes is widely recognized as a detrimental environmental issue, yet we lack a comparable understanding of hypoxia in rivers. We investigated controls on hypoxia using 118 million paired observations of dissol…
View article: Light and hydrologic connectivity drive dissolved oxygen synchrony in stream networks
Light and hydrologic connectivity drive dissolved oxygen synchrony in stream networks Open
Stream dissolved oxygen (DO) dynamics are an outcome of metabolic activity and subsequently regulate ecosystem functions such as in‐stream solute and sediment reactions. The synchronization of DO signals in and across stream networks is bo…
View article: Timed Creatinine Clearance and Measured Glomerular Filtration Rate in Living Kidney Donors
Timed Creatinine Clearance and Measured Glomerular Filtration Rate in Living Kidney Donors Open
Assessment of predonation glomerular filtration rate (GFR) is a key aspect of the evaluation of potential living kidney donors. In the United States, measurement of donor GFR is a regulatory requirement and most commonly assessed using 24-…
View article: Stream metabolism sources a large fraction of carbon dioxide to the atmosphere in two hydrologically contrasting headwater streams
Stream metabolism sources a large fraction of carbon dioxide to the atmosphere in two hydrologically contrasting headwater streams Open
Headwater streams are control points for carbon dioxide (CO 2 ) emissions to the atmosphere, with relative contributions to CO 2 emission fluxes from lateral groundwater inputs widely assumed to overwhelm those from in‐stream metabolic pro…
View article: Prognostic indicators and outcomes of hospitalised COVID-19 patients with neurological disease: An individual patient data meta-analysis
Prognostic indicators and outcomes of hospitalised COVID-19 patients with neurological disease: An individual patient data meta-analysis Open
Background Neurological COVID-19 disease has been reported widely, but published studies often lack information on neurological outcomes and prognostic risk factors. We aimed to describe the spectrum of neurological disease in hospitalised…
View article: The warmer the better?: the relationship between ecosystem metabolism and temperature, possible implications under climate change &#8211; a meta-analysis
The warmer the better?: the relationship between ecosystem metabolism and temperature, possible implications under climate change – a meta-analysis Open
<p>River and stream metabolism have been proposed as an important tool to determine ecological status, as it encompasses most of the environmental interactions. However, some of the factors influencing it have not been studied with e…
View article: Light and flow regimes regulate the metabolism of rivers
Light and flow regimes regulate the metabolism of rivers Open
Significance This paper provides a comprehensive analysis of the annual patterns of ecosystem productivity and respiration for more than 200 rivers, comparing the magnitude and phenology of river metabolic regimes with annual estimates fro…