A5102739565- Atmospheric chemistry and aerosols
- Marine and coastal ecosystems
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Electrocatalysts for Energy Conversion
- Indoor Air Quality and Microbial Exposure
- Air Quality Monitoring and Forecasting
- Microbial Community Ecology and Physiology
- Metalloenzymes and iron-sulfur proteins
- Water Quality Monitoring and Analysis
- Icing and De-icing Technologies
- Marine Biology and Ecology Research
- Marine and coastal plant biology
- Odor and Emission Control Technologies
- CO2 Reduction Techniques and Catalysts
- Fire dynamics and safety research
- Toxic Organic Pollutants Impact
- Fire effects on ecosystems
- Ocean Acidification Effects and Responses
- Microplastics and Plastic Pollution
- Isotope Analysis in Ecology
- Evacuation and Crowd Dynamics
- Pesticide Residue Analysis and Safety
- Mass Spectrometry Techniques and Applications
Colorado State University
2022-2025
University of California, San Diego
2020-2023
William & Mary
2014-2016
Williams (United States)
2014-2016
Colonial Williamsburg Foundation
2015
Significance Sea spray aerosol, produced through breaking waves, is one of the largest sources environmental particles. Once in atmosphere, sea aerosol influences cloud formation, serves as microenvironments for multiphase atmospheric chemical reactions, and impacts human health. All these are affected by acidity. Here we show that freshly emitted particles become highly acidic within minutes they transferred across ocean−air interface. These results have important implications chemistry...
Marine aerosols play a critical role in impacting our climate by seeding clouds over the oceans. Despite decades of research, key questions remain regarding how ocean biological activity changes composition and cloud-forming ability marine aerosols. This uncertainty largely stems from an inability to independently determine potential primary versus secondary complex environments. Here, we present results unique 6-day mesocosm experiment where isolated studied course phytoplankton bloom. The...
Iron complexes containing tetradentate monophenolate ligands have been found to be highly active for the electrocatalytic reduction of protons hydrogen gas. Catalysis occurs at −1.17 V vs SCE in CH3CN with a turnover frequency up 1000 s–1 and 660 mV overpotential. Interestingly, catalyst activity is enhanced presence water, achieving frequencies 3000 an overpotential 800 mV, making it one most iron electrocatalysts currently reported. The also capable generating from purely aqueous buffer...
A series of Fe(III) complexes were recently reported that are stable and active electrocatalysts for reducing protons into hydrogen gas. Herein, we report the incorporation these a photocatalytic system production. Hydrogen evolution is observed when catalysts paired with fluorescein (chromophore) triethylamine (sacrificial electron source) in 1:1 ethanol:water mixture. The highly stable, achieving TONs > 2100 (with respect to catalyst) after 24 h. Catalysis proceeds through reductive...
Abstract. The oxidation of dimethyl sulfide (DMS; CH3SCH3), emitted from the surface ocean, contributes to formation Aitken mode particles and their growth cloud condensation nuclei (CCN) sizes in remote marine environments. It is not clear whether other less commonly measured marine-derived, sulfur-containing gases share similar dynamics DMS contribute secondary aerosol formation. Here, we present measurements gas-phase volatile organosulfur molecules taken with a Vocus...
Wildfires are increasing in frequency, raising concerns that smoke can permeate indoor environments and expose people to chemical air contaminants. To study transformations evaluate mitigation strategies, we added a test house. Many volatile organic compounds (VOCs) persisted days following the injection, providing longer-term exposure pathway for humans. Two time scales control VOC partitioning: faster one (1.0 5.2 hours) describes reach equilibrium between adsorption desorption processes...
The Chemical Assessment of Surfaces and Air (CASA) study aimed to understand how chemicals transform in the indoor environment using perturbations (
A nickel complex containing a conjugated bis-dithiocarbazate ligand is an active catalyst for the reduction of protons into hydrogen gas.
Saccharides are a large class of organic matter in sea spray aerosol (SSA) that can impact its climate-relevant properties. In seawater, saccharides produced, exuded, and consumed by phytoplankton heterotrophic bacteria (HB). Herein, we add the HB strains Alteromonas sp. (AltSIO), Pseudoalteromonas (ATW7), Flavobacteria bacterium (BBFL7) to marine microcosms during blooms directly probe on composition size seawater SSA for first time. Enrichment factors (EFs) saccharide relative were...
The impact of sea spray aerosols (SSAs) on Earth's climate remains uncertain in part due to size-dependent particle-to-particle variability SSA physicochemical properties such as morphology, composition, phase state, and water uptake that can be further modulated by the environment relative humidity (RH). current study investigates these a function particle size RH, while focusing submicrometer nascent (0.1–0.6 μm) collected throughout phytoplankton bloom. Filter-based thermal optical...
Organic emissions from coastal waters play an important but poorly understood role in atmospheric chemistry regions. A mesocosm experiment focusing on facilitated biological blooms seawater, SeaSCAPE (Sea Spray Chemistry and Particle Evolution), was performed to study emission of volatile gases, primary sea spray aerosol, formation secondary marine aerosol as a function ocean chemical processes. Here, we report observations aerosol-phase benzothiazoles context with complementary measurements...
ConspectusOcean–atmosphere interactions control the composition of atmosphere, hydrological cycle, and temperature our planet affect human ecosystem health. Our understanding impact ocean emissions on atmospheric chemistry climate is limited relative to terrestrial systems, despite fact that oceans cover majority (71%) Earth. As a result, marine aerosols clouds represents one largest uncertainties in climate, which limiting ability accurately predict future temperatures planet. The emission...
The organic composition of coastal sea spray aerosol is important for both atmospheric chemistry and public health but remains poorly characterized. Coastal waters contain an material derived from anthropogenic processes, such as wastewater discharge, biological including blooms. Here, we probe the chemical fraction over course 2019 SeaSCAPE mesocosm experiment, in which a phytoplankton bloom was facilitated natural water La Jolla, California. We apply untargeted two-dimensional gas...
Sea spray aerosol (SSA) represents the largest flux of mass annually, impacting Earth's climate and hydrological cycle by acting as cloud condensation ice nuclei. The phase state (viscosity, η) particles is important for impacts on air quality, but viscosity SSA chemical biological drivers have not been evaluated. We measured variability in relative humidity (RH)-dependent states (with a peak number-weighted aerodynamic diameter ∼0.2 μm) based particle bounce factors (BFs) calculated glass...
Ice nucleating particles (INPs) in sea spray aerosol (SSA) are important for ice formation clouds over oceans. We found that SSA INP concentrations during a phytoplankton bloom were degraded with exposure to 3 8 days of atmospheric oxidation.
The effects of atmospheric aging on single-particle nascent sea spray aerosol (nSSA) physicochemical properties, such as morphology, composition, phase state, and water uptake, are important to understanding their impacts the Earth's climate. present study investigates these properties by focusing aged SSA (size range 0.1–0.6 μm) comparing with a similar size nSSA, both generated at peak phytoplankton bloom during mesocosm study. SSAs were exposing nSSA OH radicals exposures equivalent 4–5...
The chemical composition of indoor air is strongly driven by the and properties surfaces. At Chemical Assessments Surfaces Air (CASA) campaign, we performed controlled additions ammonia (reaching up to 297 ppb 662 ppb) investigate impacts changing surface basicity on fate gaseous particulate acids bases in an unoccupied house. In response injections, nitrogen-containing compounds (C2–7H3–11N1O0–3) were emitted from surfaces gas phase with signals increasing 101% 104% compared their prior...
Sea spray is a significant global aerosol source with impacts on marine cloud formation and climate. The physical properties atmospheric fate of the sea (SSA) depend its chemical composition, but current understanding sources composition or SSA remains limited particularly for smallest aerosol. ultrafine (<100 nm diameter) particles controls critical diameter activation to droplets. This study presents online measurements salt organic mass fractions in an measured during Spray Chemistry...
Marine chromophoric dissolved organic matter (m-CDOM) mediates many vital photochemical processes at the ocean's surface. Isolating m-CDOM within chemical complexity of marine has remained an analytical challenge. The SeaSCAPE campaign, a large-scale mesocosm experiment, provided unique opportunity to probe in situ production across phytoplankton and microbial blooms. Results from mass spectrometry coupled with UV-VIS spectroscopy reveal chemodiverse set compounds well-correlated increases...
Abstract Humic‐like substances (HULIS) are present in every environmental reservoir, including the ocean and atmosphere. Ocean‐derived HULIS can be transferred to atmosphere form of sea spray aerosols (SSA). Little information exists on factors controlling this transfer process or how alter SSA physicochemical properties, cloud‐forming ability, atmospheric reactions. Here, using excitation‐emission matrix spectroscopy isolated ocean‐atmosphere systems, we investigated biology affects...
Marine aerosols strongly influence climate through their interactions with solar radiation and clouds. However, significant questions remain regarding the influences of biological activity seawater chemistry on flux, chemical composition, climate-relevant properties marine gases. Wave channels, a traditional tool physical oceanography, have been adapted for large-scale ocean-atmosphere mesocosm experiments in laboratory. These enable study under controlled conditions which isolate system...
Abstract. The oxidation of dimethyl sulfide (DMS; CH3SCH3), emitted from the surface ocean, contributes to formation Aitken mode particles and their growth cloud condensation nuclei (CCN) sizes in remote marine environments. It is not clear whether other, less commonly measured marine-derived, sulfur-containing gases share similar dynamics DMS contribute secondary aerosol formation. Here, we present measurements gas-phase volatile organosulfur molecules taken with a Vocus proton transfer...
Previous time-integrated (2 h to 4 h) measurements show that total gas-phase water-soluble organic carbon (WSOC