A5030018152- Hydrology and Watershed Management Studies
- Groundwater and Isotope Geochemistry
- Climate variability and models
- Isotope Analysis in Ecology
- Atmospheric chemistry and aerosols
- Geology and Paleoclimatology Research
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Soil and Water Nutrient Dynamics
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Spectroscopy and Laser Applications
- Hydrology and Drought Analysis
- Atmospheric aerosols and clouds
- Groundwater flow and contamination studies
- Genetics, Bioinformatics, and Biomedical Research
- Research Data Management Practices
- Plant Water Relations and Carbon Dynamics
- Air Quality and Health Impacts
- Lichen and fungal ecology
- Geochemistry and Geologic Mapping
- Flood Risk Assessment and Management
- Water resources management and optimization
- Radioactive contamination and transfer
Utah Geological Survey
2020-2024
Utah Water Science Center
2020-2024
United States Geological Survey
2024
University of Utah
2016-2022
Dartmouth College
2014-2017
Los Alamos National Laboratory
2012-2016
Dartmouth Hospital
2014
Michigan Technological University
2011
Stable isotope ratios of hydrogen and oxygen have been applied to water cycle research for over 60 years. Over the past two decades, however, new data, data compilations, quantitative methods supported application isotopic address large-scale problems. Recent results demonstrated impact climate variation on atmospheric cycling, provided constraints continental- global-scale land-atmosphere vapor fluxes, revealed biases in sources runoff hydrological models, illustrated regional patterns use...
Abstract Local meteoric water lines (LMWLs) represent the site‐specific long‐term covariation of hydrogen and oxygen stable isotope ratios. LMWLs have practical utility as a hydrologic framework benchmarks for evaluating hydroclimatic processes in isotope‐enabled climate models. In this manuscript, we characterize global distribution compare them to from model data. To evaluate sensitivity covariance ratios data set length, paired time series rarifaction with Bayesian ellipse estimation. We...
Abstract. The detailed molecular composition of laboratory generated limonene ozonolysis secondary organic aerosol (SOA) was studied using ultrahigh-resolution Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. Approximately 1200 formulas were identified in the SOA over range 140 to 850 Da. Four characteristic groups high relative abundance species observed; they indicate an array accretion products that retain a large fraction skeleton. each are related one another by...
Society and the environment in arid southwestern United States depend on reliable water availability, yet current use outpaces supply. Water demand is projected to grow future climate change expected reduce To adapt, managers need robust estimates of regional supply support management decisions. address this need, we estimate streamflow seven resource regions U.S. using a new SPAtially Referenced Regressions On Watershed attributes (SPARROW) model. We present projections corresponding input...
Abstract Continued climate warming is reducing seasonal snowpacks in the western United States, where >50% of historical water supplies were snowmelt‐derived. In Upper Colorado River Basin, declining snow equivalent (SWE) and altered surface input (SWI, rainfall snowmelt available to enter soil) timing magnitude affect streamflow generation availability. To adapt effectively future conditions, we need understand current spatiotemporal distributions SWE SWI how they may change decades. We...
Abstract Baseflow is critical to sustaining streamflow in the Upper Colorado River Basin. Therefore, effective water resources management requires estimates of baseflow response climatic changes. This study provides first projected changes from historical (1984–2012) thirty‐year periods centered around 2030, 2050, and 2080 under warm/wet, median, hot/dry conditions using a hybrid statistical‐deterministic model. Total supplied Lower Basin may decline by up 33%, although this value increase...
The Salt Lake Valley, UT, USA, is proximal to the desiccating Great (GSL). Prior work has found that this lakebed/playa contributes metals-laden dust snow in Wasatch and Uinta Mountains. Dust industrial particulate pollution are also delivered communities along Front, but their sources, compositions, fluxes poorly characterized. In study, we analyzed deposited 18 passive samplers positioned near GSL, cities Valley for total flux, <63 µm fraction,
Stable isotope data have made pivotal contributions to nearly every discipline of the physical and natural sciences. As generation application stable continues grow exponentially, so does need for a unifying repository improve accessibility promote collaborative engagement. This paper provides an overview design, development, implementation IsoBank (www.isobank.org), community-driven initiative create open-access implemented online in 2021. A central goal is provide web-accessible database...
Abstract Freshwater salinization is a growing global concern impacting human and ecosystem needs with impacts to water availability for ecological uses. In the Upper Colorado River Basin (UCRB), dissolved solids in streams compound ongoing supply challenges further limit cause economic damages. Much effort has been dedicated understanding solid sources, transport, management region, yet temporal variability loading from key sources such as irrigated lands influence of climate on remains...
Abstract As atmospheric dust deposition continues to increase across the southwestern United States, it has potential alter ecosystem productivity and structure by delivering nutrients, base cations, pollutants remote mountain sites. Due sparse distribution of monitoring sites, open questions remain about spatial temporal variability fluxes composition mountainous terrain. We present a 1 year (November 2017 November 2018) record seasonal from an elevation transect Colorado Front Range...
Abstract. In this study, precipitation isotopic variations at Barrow, AK, USA, are linked to conditions the moisture source region, along transport path, and site. Seventy events between January 2009 March 2013 were analyzed for δ2H deuterium excess. For each event, vapor regions identified with hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) air parcel tracking program in back-cast mode. The results show that region migrated annually, most distal (proximal) southerly...
Abstract The North American Monsoon (NAM) is an important source of precipitation across the southwestern United States. approximate northern boundary this feature crosses Navajo Nation (NN), in Four Corners region, where NAM rains have long been to livelihoods Native Americans. Relatively little known about characteristics and hydrological significance region. Here, we report a new 4 yr record stable H O isotope ratios monsoon‐season rainfall water resources NN. Monthly samples collected at...
Abstract. The hydrogen and oxygen stable isotope ratios of water have been used to identify sources, transport pathways, phase-change processes within the cycle, supporting hydrologic, forensic, ecologic, hydroclimatic investigations. Here, we introduce a unique, open-access, global database (δ18O, δ17O, δ2H) from various types. This facilitates data preservation, supports standardized metadata collection, decreases time investment for meta-analytic research reference dataset discovery. As...
We evaluated the Virgin, Verde, Salt, and Gila Rivers in Lower Colorado River Basin. The watersheds have extents Arizona, Utah, New Mexico, US Sonora, MX. calculated trends total dissolved solids (TDS) concentrations fluxes with Weighted Regressions on Time, Discharge Season model. modeling framework leverages daily streamflow discrete water quality observations at specific monitoring sites. for a common period (1976–2008) whole of record each site terms climate anthropogenic controls. Three...
Resilience is often invoked to address systemic marginalization (e.g. racism) in academia but inadvertently maintains harmful systems. We argue that the ability transform systems, as opposed persevering within them, must be prioritized make real, lasting change.
Abstract. The National Water Model (NWM) provides critical analyses and projections of streamflow that support water management decisions. However, the NWM performs poorly in lower elevation rivers western United States (US). accuracy depends on fidelity model inputs representation calibration processes sources. To evaluate NWM, we performed a isotope (δ18O δ2H) mass balance using long term mean summer hydrologic fluxes between 2000 2019, gridded precipitation groundwater ratios. We compared...
Stream water-quality and its drivers vary across time space, but we only monitor a small fraction of streams consistently over long periods time. Such limited monitoring necessitates the development application spatially explicit dynamic models to predict water quality at unmonitored locations. Historically, data computational limitations have hindered temporally variable prediction efforts large spatial scales. However, hybrid statistical process models, such as Spatially Referenced...
The National Water Model (NWM) provides critical analyses and projections of streamflow that support water management decisions. However, the NWM performs poorly in lower-elevation rivers western United States (US). accuracy depends on fidelity model inputs representation calibration processes sources. To evaluate performance US, we compared observations river isotope ratios (
Abstract Estimating snow conditions is often done using numerical snowpack evolution models at spatial resolutions of 500 m and greater; however, depth in complex terrain varies on sub‐meter scales. This study investigated how the distribution simulated varied across seven model from 30 to 1,000 over two meteorological data sets, coarser (≈12 km) finer (4 km). Simulated covered area (SCA) was compared remotely sensed SCA watershed mean peak water equivalent (SWE) four streamflow statistics...
Abstract Stable isotope ratios of precipitation trace mechanisms hydroclimatic change in the modern and paleoclimate record. Patterns drivers isotopic at multidecadal timescales have remained unclear, however, due to limitations observational Here, we use a 65‐year global data compilation estimate solstial season δ 18 O p trends. Spatially organized regions suggest divergent controls, propose that changes atmospheric water balance dominate trends moisture‐limited areas, whereas upwind source...