A5006536606- Seismic Waves and Analysis
- Methane Hydrates and Related Phenomena
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- GNSS positioning and interference
- Solar and Space Plasma Dynamics
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Hydrology and Watershed Management Studies
- Metabolomics and Mass Spectrometry Studies
- Fish Ecology and Management Studies
- Isotope Analysis in Ecology
- Water Quality Monitoring and Analysis
- Smart Materials for Construction
- Atmospheric and Environmental Gas Dynamics
- Hydrological Forecasting Using AI
- Fire effects on ecosystems
- Groundwater and Isotope Geochemistry
- Wastewater Treatment and Nitrogen Removal
- Groundwater flow and contamination studies
- Hydrology and Sediment Transport Processes
- Water Quality Monitoring Technologies
- Advanced Chemical Sensor Technologies
Pacific Northwest National Laboratory
2018-2025
Parallel Consulting (United States)
2024
Washington State University
2022-2023
Environmental Molecular Sciences Laboratory
2022-2023
Battelle
2020
University of New Mexico
2020
Predictive biogeochemical modeling requires data-model integration that enables explicit representation of the sophisticated roles microbial processes transform substrates. Data from high-resolution organic matter (OM) characterization are increasingly available and can serve as a critical resource for this purpose, but their incorporation into models is often prohibited due to an over-simplified description reaction networks. To fill gap, we proposed new concept modeling—termed...
Organic matter (OM) metabolism in freshwater ecosystems is a critical source of uncertainty global biogeochemical cycles, yet the processes regulating aerobic respiration aquatic environments remain poorly understood. Aerobic typically predicted through kinetic controls such as organic carbon and oxygen concentrations, while assuming thermodynamic regulation has no influence. The role OM thermodynamics been mainly explored under anaerobic conditions; however, recent observations have...
River corridor metabolomes reflect organic matter (OM) processing that drives aquatic biogeochemical cycles. Recent work highlights the power of ultrahigh-resolution mass spectrometry for understanding metabolome composition and river metabolism. However, there have been no studies on global chemogeography surface water sediment using techniques. Here, we describe a community science effort from Worldwide Hydrobiogeochemistry Observation Network Dynamic Systems (WHONDRS) consortium to...
Abstract. Shifting phosphorus (P) dynamics after wildfires can have cascading impacts from terrestrial to aquatic environments. However, it is unclear if post-fire responses are primarily driven by changes the molecular composition of charred material or transport P-containing compounds. We used laboratory leaching experiments Douglas-fir forest and sagebrush shrubland chars examine how potential mobility P compounds influenced different burn severities. Burning produced a 6.9- 29- fold...
Dissolved organic matter (DOM) is vital to ecosystem functions, influencing nutrient cycles and water quality. Understanding the processes driving DOM chemistry variation remains a challenge. By examining these through community ecology perspective, we aim understand balance between stochastic forces (e.g., random mixing of DOM) deterministic systematic loss certain types molecules) shaping chemistry. Previous research on influences over applied null models aquatic environments subsurface...
Abstract. Understanding aquatic ecosystem metabolism involves the study of two key processes: carbon fixation via primary production and organic C mineralization as total respiration (ERtot). In streams rivers, ERtot includes in water column (ERwc) sediments (ERsed). While literature surveys suggest that ERsed is often a dominant contributor to ERtot, recent studies indicate relative influence sediment-associated processes versus can fluctuate along river continuum. Still, comprehensive...
Abstract. Although most field and modeling studies of river corridor exchange have been conducted at scales ranging from tens to hundreds meters, results these are used predict their ecological hydrological influences the scale networks. Further complicating prediction, exchanges expected vary with hydrologic forcing local geomorphic setting. While we desire predictive power, lack a complete spatiotemporal relationship relating discharge variation in geologic setting that is across basin....
Radioiodine (129I) poses a risk to the environment due its long half-life, toxicity, and mobility. It is found at U.S. Department of Energy Hanford Site legacy releases nuclear wastes subsurface where 129I predominantly present as iodate (IO3-). To date, cost-effective scalable cleanup technology for has not been identified, with hydraulic containment implemented remedial approach. Here, novel high-performing sorbents remediation capacity reduce concentrations or below US Environmental...
Abstract. River corridors are fundamental components of the Earth system, and their biogeochemistry can be heavily influenced by processes in subsurface zones immediately below riverbed, referred to as hyporheic zone. Within zone, organic matter (OM) fuels microbial respiration, OM chemistry influences aerobic anaerobic biogeochemical processes. The link between respiration has been hypothesized mediated molecular diversity, whereby is predicted decrease with increasing diversity. Here we...
1 INTRODUCTION:Climate change is driving earlier seasonal onset of wildfire, increased fire frequency, and larger fires in many regions globally (Flannigan et al., 2009; Westerling, 2016). Wildfires induce changes ecohydrological processes, including reduced infiltration from soil hydrophobicity (DeBano, 2000), canopy cover that diminishes evapotranspiration interception precipitation (Guo 2023; Wine 2018). The resulting streamflow terrestrial-aquatic connectivity these shifts processes...
Abstract. Surface water quality along river corridors can be modulated by hyporheic zones (HZs) that are ubiquitous and biogeochemically active. Watershed management practices often ignore the potentially important role of HZs as a natural reactor. To investigate effect hydrological exchange biogeochemical processes on fate nutrients in surface HZs, novel model, SWAT-MRMT-R, was developed coupling Soil Water Assessment Tool (SWAT) watershed model reaction module from flow reactive transport...
Abstract. Conceptual frameworks linking microbial community membership, properties, and processes with the environment emergent function have been proposed but remain untested. Here we refine test a recent conceptual framework using hyporheic zone sediments exposed to wetting–drying transitions. Our refined includes relationships between cumulative properties of (e.g., assembly biogeochemical rates), environmental features organic matter thermodynamics), ecosystem function. primary aim was...
Changes in climate, season, and vegetation can alter organic export from watersheds. While an accepted tradeoff to protect public health, disinfection processes during drinking water treatment adversely react with compounds form byproducts (DBPs). By extension, DBP monitoring yield insights into hydrobiogeochemical dynamics within watersheds their implications for resource management. In this study, we analyzed temporal trends a facility that sources Coal Creek Crested Butte, Colorado. These...
Introduction Dissolved organic matter (DOM) composition varies over space and time, with a multitude of factors driving the presence or absence each compound found in complex DOM mixture. Compounds ubiquitously present across wide range river systems (hereafter termed core compounds) may differ chemical reactivity from compounds only few settings satellite compounds). Here, we investigated spatial patterns molecular formulae (occupancy) surface water sediments 97 corridors at continental...
The intensity and frequency of ecosystem disturbances are shifting with climate change, multiple in close succession have the potential to compound their independent effects strongly alter structure function. In this paper, we examine an extreme precipitation event on a montane forest landscape that was previously decimated by wildfire (37 months prior) relative unburned site same ecosystem. We assessed responses soil edaphic properties, bacterial community composition assembly, enzyme...
A large amount of dissolved organic matter (DOM) is transported to the ocean from terrestrial inputs each year (~0.95 Pg C per year) and undergoes a series abiotic biotic reactions, causing significant release CO 2 . Combined, these reactions result in variable DOM characteristics (e.g., nominal oxidation state carbon, double-bond equivalents, chemodiversity) which have demonstrated impacts on biogeochemistry ecosystem function. Despite this importance, however, comparatively few studies...
Abstract Advancing our understanding of dissolved organic matter (DOM) chemistry in aquatic systems necessitates the integration data streams from multiple analytical platforms. Some measurements require pretreatment with solid phase extraction (SPE), while others are performed directly on whole water samples. Evidence has suggested that SPE will be biased against select DOM fractions, leading to concerns over ability establish linkages across platforms variable needs for pretreatment, such...
Abstract. A comprehensive set of measurements and calculated metrics describing physical, chemical, biological conditions in the river corridor is presented. These data were collected a catchment-wide, synoptic campaign H. J. Andrews Experimental Forest (Cascade Mountains, Oregon, USA) summer 2016 during low-discharge conditions. Extensive characterization 62 sites including surface water, hyporheic streambed sediment was conducted spanning 1st- through 5th-order reaches network. The...
Abstract Predictive biogeochemical modeling requires data-model integration that enables explicit representation of the sophisticated roles microbial processes transform substrates. Data from high-resolution organic matter (OM) characterization are increasingly available and can serve as a critical resource for this purpose, but their incorporation into models is often prohibited due to an over-simplified description reaction networks. To fill gap, we proposed new concept modeling—termed...
Abstract. Biochemical transformations of organic matter (OM) are a primary driver river corridor biogeochemistry, thereby modulating ecosystem processes at local to global scales. OM driven by diverse biotic and abiotic processes, but we lack knowledge how the diversity those varies across corridors surface subsurface components corridors. To fill this gap quantified number putative molecules using ultra-high-resolution mass spectrometry. The unique is used here as proxy for biochemical...
Abstract. Pyrogenic organic matter (PyOM) from wildfires impacts river corridors globally and is widely regarded as resistant to biological degradation. Though recent work suggests PyOM may be more bioavailable than historically perceived, estimating bioavailability across its chemical spectrum remains elusive. To address this knowledge gap, we assessed potential of representative compounds relative ubiquitous dissolved (DOM) with a substrate-explicit model. The range was greater natural...