Publications

Publications

Kinetics of Methylmercury Production Revisited

Journal: Environmental Science & Technology

Laboratory measurements of the biologically mediated methylation of mercury (Hg) to the neurotoxin monomethylmercury (MMHg) often exhibit kinetics that are inconsistent with first-order kinetic models. Using time-resolved measurements of filter passing Hg and MMHg during methylation/demethylation assays, a multisite...

Differential ecophysiological responses and resilience to heat wave events in four co-occurring temperate tree species

Journal: IOP Science

Extreme summer heat waves are known to induce foliar and stem mortality in temperate forest ecosystems, yet our mechanistic knowledge of physiological thresholds for damage is lacking. Current spatiotemporal simulations of forest growth responses to climate change fail to explain the variability between co-...

2017 Hydropower Market Report

The 2017 Hydropower Market Report provides industry, policy makers, and other interested stakeholders with important data and information on the distribution, characteristics, and trends of the hydropower industry in the United States. Hydropower currently accounts for 7% of installed generation capacity, and 43...

Molecular Insights into Arctic Soil Organic Matter Degradation under Warming

Journal: Environmental Science & Technology

Molecular composition of the Arctic soil organic carbon (SOC) and its susceptibility to microbial degradation are uncertain due to heterogeneity and unknown SOC compositions. Using ultrahigh-resolution mass spectrometry, we determined the susceptibility and compositional changes of extractable dissolved organic matter...

Ecosystem warming extends vegetation activity but heightens vulnerability to cold temperatures

Journal: Nature

Shifts in vegetation phenology are a key example of the biological effects of climate change1,2,3. However, there is substantial uncertainty about whether these temperature-driven trends will continue, or whether other factors—for example, photoperiod—will become more important as warming exceeds the bounds of...

A physical catalyst for the electrolysis of nitrogen to ammonia

Journal: Science Advances

Ammonia synthesis consumes 3 to 5% of the world’s natural gas, making it a significant contributor to greenhouse gas emissions. Strategies for synthesizing ammonia that are not dependent on the energy-intensive and methane-based Haber-Bosch process are critically important for reducing global energy consumption and...

The role of bioenergy in a climate -changing world

Journal: Environmental Development

Bioenergy has been under intense scrutiny over the last ten years with significant research efforts in many countries taking place to define and measure sustainable practices. We describe here the main challenges and policy issues and provide policy recommendations for scaling up sustainable bioenergy approaches...

Organ and effective dose rate coefficients for submersion exposure in occupational settings

Journal: Radiation and Environmental Biophysics

External dose coefficients for environmental exposure scenarios are often computed using assumption on infinite or semi-infinite radiation sources. For example, in the case of a person standing on contaminated ground, the source is assumed to be distributed at a given depth (or between various depths) and extending...

Comparison of photon organ and effective dose coefficients for PIMAL stylized phantom in bent positions in standard irradiation geometries

Journal: Radiation and Environmental Biophysics

Computational phantoms with articulated arms and legs have been constructed to enable the estimation of radiation dose in different postures. Through a graphical user interface, the Phantom wIth Moving Arms and Legs (PIMAL) version 4.1.0 software can be employed to articulate the posture of a phantom and generate a...

Root and Phizosphere Bacterial Phosphatase Activity Varies with Tree Species and Soil Phosphorus Availability in Puerto Rico Tropical Forest

Journal: Frontiers in Plant Science

Climatic conditions in tropical forests combined with the immobility of phosphorus due to sorption on mineral surfaces or result in soils typically lacking in the form of phosphorus (orthophosphate) most easily metabolized by plants and microbes. In these soils, mineralization of organic phosphorus can be the major...

Networking our science to characterize the state, vulnerabilities, and management opportunities of soil organic matter

Journal: Global Change Biology

Soil organic matter (SOM) supports the Earth's ability to sustain terrestrial ecosystems, provide food and fiber, and retains the largest pool of actively cycling carbon. Over 75% of the soil organic carbon (SOC) in the top meter of soil is directly affected by human land use. Large land areas have lost SOC as a...

The Sphagnome Project: enabling ecological and evolutionary insights through a genus-level sequencing project

Journal: New Phytologist

Considerable progress has been made in ecological and evolutionary genetics with studies demonstrating how genes underlying plant and microbial traits can influence adaptation and even ‘extend’ to influence community structure and ecosystem level processes.Progress in this area is limited to model systems with deep...

Drought impacts on photosynthesis, isoprene emission and atmospheric formaldehyde in a mid-latitude forest

Journal: Atmospheric Environment

Isoprene plays a critical role in air quality and climate. Photosynthesis (gross primary productivity, GPP)and formaldehyde (HCHO) are both related to isoprene emission at large spatiotemporal scales, but neither is a perfect proxy. We apply multiple satellite products and site-level measurements to examine the impact...

Estimated dose rates to members of the public form external exposure to patients with 131I thyroid treatment

Journal: Medical Physics

Estimated dose rates that may result from exposure to patients who had been administered iodine-131 (131I) as part of medical therapy were calculated. These effective dose rate estimates were compared with simplified assumptions under the United States Nuclear Regulatory Commission Regulatory Guide 8.39, which does not...

Identifying non-reference sites to guide stream restoration and long-term monitoring

Journal: Science of The Total Environment

The reference condition paradigm has served as the standard for assessing the outcomes of restoration projects, particularly their success in meeting project objectives. One limitation of relying solely on the reference condition in designing and monitoring restoration projects is that reference conditions do not...

Predicting total dissolved gas travel time in hydropower reservoirs

Journal: Journal of Environmental Engineering

Large spills at hydropower facilities can produce environmentally unfavorable supersaturated total dissolved gas (TDG) conditions. Enhanced coordination between adjacent hydropower facilities is required when a large, brief spill creates a pulse of TDG that is transported into a downstream reservoir. A premium is...

Development and implementation of an optimization model for hydropower and total dissolved gas in the mid-Columbia river system

Journal: Journal of Water Resources Planning and Managment

Managing energy, water, and environmental priorities and constraints within a cascade hydropower system is a challenging multi-objective optimization effort that requires advanced modeling and forecasting tools. Within the mid-Columbia River system, there is currently a lack of specific solutions for predicting how...

Wetland ecosystem health assessment through integrating remote sensing and inventory data with an assessment model for the Hangzhou Bay, China

Journal: The Science of the Total Environment

Due to rapid urbanization, industrialization and population growth, wetland area in China has shrunk rapidly and many wetland ecosystems have been reported to degrade during recent decades. Wetland health assessment could raise the public awareness of the wetland condition and guide policy makers to make reasonable...

A quantile-based scenario analysis approach to biomass supply chain optimization under uncertainty

Journal: Computers and Chemical Engineering

Supply chain optimization for biomass-based power plants is an important research area due to greater emphasis on renewable power energy sources. Biomass supply chain design and operational planning models are often formulated and studied using deterministic mathematical models. While these models are beneficial for...

Structure and thermochemistry of perrhenate sodalite and mixed guest perrhenate/pertechnetate sodalite

Journal: Environmental Science and Technology

Treatment and immobilization of technetium-99 (99Tc) contained in reprocessed nuclear waste and present in contaminated subsurface systems represents a major environmental challenge. One potential approach to managing this highly mobile and long-lived radionuclide is immobilization into micro- and meso-porous...

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