A5090104374- Geology and Paleoclimatology Research
- Groundwater and Isotope Geochemistry
- Methane Hydrates and Related Phenomena
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Geological and Geochemical Analysis
- Hydrology and Watershed Management Studies
- Silicon Effects in Agriculture
- Coal and Its By-products
- Fish Ecology and Management Studies
- Hydrocarbon exploration and reservoir analysis
- CO2 Sequestration and Geologic Interactions
- Electrokinetic Soil Remediation Techniques
- Geological formations and processes
- Soil erosion and sediment transport
- Groundwater flow and contamination studies
- Geochemistry and Geologic Mapping
- Coral and Marine Ecosystems Studies
- Arsenic contamination and mitigation
- Fluoride Effects and Removal
- Groundwater and Watershed Analysis
- Per- and polyfluoroalkyl substances research
- Geological and Geophysical Studies
Rice University
2016-2024
Rice Research Institute
2023
California Institute of Technology
2017-2020
University of Southern California
2013-2019
Bridge University
2019
Southern California Earthquake Center
2014-2019
University of Cambridge
2019
Southern California University for Professional Studies
2015
Pomona College
2011-2013
University of Almería
2004
Connections between glaciation, chemical weathering, and the global carbon cycle could steer evolution of climate over geologic time, but even directionality feedbacks in this system remain to be resolved. Here, we assemble a compilation hydrochemical data from glacierized catchments, use evaluate dominant reactions associated with glacial explore implications for long-term geochemical cycles. Weathering yields catchments our are higher than average, which results, part, runoff glaciated...
Soil contamination is an environmental issue due to increasing anthropogenic activities. Existing processes for soil remediation suffer from long treatment time and lack generality because of different sources, occurrences, properties pollutants. Here, we report a high-temperature electrothermal process rapid, water-free multiple pollutants in soil. The temperature contaminated with carbon additives ramps up 1000 3000 °C as needed within seconds via pulsed direct current input, enabling the...
Abstract. The mass of carbon stored as organic matter in terrestrial systems is sufficiently large to play an important role the global biogeochemical cycling CO2 and O2. Field measurements radiocarbon-depleted particulate (POC) rivers suggest that persists surface environments over millennial (or greater) timescales, but exact mechanisms behind these long storage times remain poorly understood. To address this knowledge gap, we developed a numerical model for radiocarbon content riverine...
The dissolved chemistry of rivers has been extensively studied to elucidate physical and climatic controls chemical weathering at local global spatial scales, as well the impacts on climate over short geologic temporal scales. Within this effort, mixing models with Monte Carlo uncertainty propagation are a common tool for inverting measurements river distinguish among contributions from end-members distinct elemental and/or isotopic compositions. However, methods underlying prior inversion...
The oxidation of organic carbon contained within sedimentary rocks ("petrogenic" carbon, or hereafter OCpetro) emits nearly as much CO2 is released by volcanism, thereby playing a key role in the long-term global C budget. High erosion rates mountains have been shown to increase OCpetro oxidation. However, these settings also export unweathered material that may continue react downstream floodplains. relative importance versus floodplains remains difficult assess disparate methods used...
Abstract Per- and polyfluoroalkyl substances (PFAS) are persistent bioaccumulative pollutants that can easily accumulate in soil, posing a threat to environment human health. Current PFAS degradation processes often suffer from low efficiency, high energy water consumption, or lack of generality. Here, we develop rapid electrothermal mineralization (REM) process remediate PFAS-contaminated soil. With environmentally compatible biochar as the conductive additive, soil temperature increases...
Abstract. The hydrology of tropical mountain catchments plays a central role in ecological function, geochemical and biogeochemical cycles, erosion sediment production, water supply globally important environments. There have been few studies quantifying the seasonal annual budgets montane tropics, particularly cloud forests. We investigated balance hydrologic regime Kosñipata catchment (basin area: 164.4 km2) over period 2010–2011. spans 2500 m elevation eastern Peruvian Andes is dominated...
Abstract Variations in riverine solute chemistry with changing runoff are used to interrogate catchment hydrology and investigate chemical reactions Earth's critical zone. This approach requires some understanding of how spatial temporal averaging solute‐generating affect the dissolved load rivers streams. In this study, we concentration‐runoff (C‐Q) dynamics a suite major (Na, Mg, Ca, Si, K, SO 4 ) trace (Al, Ba, Cd, Co, Cr, Cu, Fe, Ge, Li, Mn, Mo, Nd, Ni, Rb, Sr, U, V, Zn) elements nested...
How glaciation affects CO2 drawdown by chemical weathering sets the strength of weathering-climate feedback, which controls exogenic carbon cycle and planetary habitability (Kump et al., 2000). However, exact role glaciers remains elusive as alters multiple factors controlling weathering, net effect is ambiguous even in directionality. While illustrative, modern observations have limited ability to constrain time-dependent behavior, thought be important glacial (Vance 2009; Kemeny 2021). To...
The landscape of academic publishing, including in geochemistry and cosmochemistry, is evolving toward greater openness accessibility. This editorial outlines the vision for Advances Geochemistry Cosmochemistry, a diamond open access journal that eliminates article processing charges prioritizes equitable to scientific knowledge. journal’s commitment Open Science as well diversity authorship representation aims address systemic inequities research publishing. Drawing on success journals like...
Abstract The response of hillslope processes to changes in precipitation may drive the observed solute geochemistry rivers with discharge. This conjecture is most robust when variations key environmental factors that affect (e.g., lithology, erosion rate, and climate) are minimal across a river's catchment area. For heterogenous catchments, temporal relative contributions different tributary subcatchments modulate runoff. In absence dense network hydrologic gauging stations, alternative...
Abstract Silicate minerals represent an important reservoir of nutrients at Earth's surface and a source alkalinity that modulates long‐term geochemical cycles. Due to the slow kinetics primary silicate mineral dissolution potential for nutrient immobilization by secondary precipitation, bioavailability many silicate‐bound may be limited ability micro‐organisms actively scavenge these via redox alteration and/or organic ligand production. In this study, we use targeted laboratory experiments...
Abstract Terrestrial organic carbon (OC) plays an important role in the cycle, but questions remain regarding controls and timescale(s) over which atmospheric CO 2 remains sequestered as particulate OC (POC). Motivated by observations that terrestrial POC is physically stored within soils other shallow sedimentary deposits, we examined sediment storage cycle. Specifically, tested hypothesis impacts age of POC. We focused on Efri Haukadalsá River catchment Iceland it lacks ancient bedrock...
The concentrations of weathering‐derived solutes in rivers and their covariance with discharge are thought to reflect reactive‐transport processes hillslopes reveal the sensitivity solute fluxes climatic change. It is expected that discharge‐driven changes water transit times play some role setting concentration‐discharge (C‐Q) relationships, but knowledge gaps remain. To explore specific shape time distribution discharge, we combine models simulate C‐Q relationships for major cations Si as...
Abstract The costs of COVID-19 are extensive, and, like the fallout most health and environmental crises in US, there is growing evidence that these weigh disproportionately on communities color. We investigated whether county-level racial composition fine particulate pollution (PM 2.5 ) indicators for incidence death rates state Texas. Using data, we ran linear regressions percent minority as well historic 2000–2016 PM levels against cases deaths per capita. found a county's composition,...
Land use and land cover (LULC) can significantly alter river water, which in turn have important impacts on downstream coastal ecosystems by delivering nutrients that promote marine eutrophication hypoxia. Well-documented temperate systems, less is known about the way relates to water quality low-lying zones tropics. Here we evaluate catchment LULC physical chemical characteristics of six rivers contribute flow into a seasonally hypoxic tropical bay Bocas del Toro, Panama. From July 2019...