A5089495810- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- nanoparticles nucleation surface interactions
- Air Quality and Health Impacts
- Indoor Air Quality and Microbial Exposure
- Icing and De-icing Technologies
- Fire dynamics and safety research
- Marine and coastal ecosystems
- Advanced Chemical Sensor Technologies
- Particle Dynamics in Fluid Flows
- Spaceflight effects on biology
- Fire effects on ecosystems
- Spectroscopy and Quantum Chemical Studies
- Air Quality Monitoring and Forecasting
- Odor and Emission Control Technologies
- Microplastics and Plastic Pollution
- Material Dynamics and Properties
University of Colorado Boulder
2023-2025
University of Colorado System
2025
University of California, San Diego
2018-2023
This work investigates the transport of fine particulate matter (PM2.5) in a multi-story test house using cooking emissions as point source. The was instrumented with 13 PM2.5 monitors, and particle sources included pan air frying, well ambient penetration during periods no indoor activity. In absence sources, we observed about 10 % concentrations penetrating indoors time lag 1 h. Similar peak were for frying same food ingredients. A cross-correlation analysis showed that it took 2 to 4 min...
The Chemical Assessment of Surfaces and Air (CASA) study aimed to understand how chemicals transform in the indoor environment using perturbations (
Ice nucleating particles (INPs) in sea spray aerosols (SSAs) are critical estimating cloud radiative forcing and precipitation with implications climate change. Laboratory experiments simulating the ocean-atmosphere environment becoming increasingly popular for studying nature of INPs SSAs. Understanding ice characteristics bulk seawater surface microlayer (SSML) can provide valuable information about emitted Samples this study were collected from a waveflume during phytoplankton bloom...
Abstract The impacts of wildfires along the wildland urban interface (WUI) on atmospheric particulate concentrations and composition are an understudied source air pollution exposure. To assess residual 2021 Marshall Fire (Colorado), a wildfire that predominantly burned homes other human-made materials, within fire perimeter escaped fire, we performed combination fine matter (PM 2.5 ) filter sampling chemical analysis, indoor dust collection community scale PurpleAir PM particle number...
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.
In the atmosphere, there are several different trajectories by which particles can nucleate ice; two of major pathways deposition and immersion freezing. Single particle depositional freezing has been widely studied with spectroscopic methods while predominantly either for within bulk aqueous solutions or using optical imaging single particles. Of few existing that monitor freezing, limited opportunities investigating impact heterogeneous chemistry on Herein, we describe a method couples...
Well-mixed atmospheric aqueous aerosol droplets containing multiple chemical species can undergo processes such as liquid–liquid phase separation (LLPS) and crystallization depending on the ambient temperature relative humidity (RH). So far, only a handful of single droplet studies have examined effect in conjunction with organic to inorganic ratio (OIR) RH for LLPS. In this work, we present temperature-controlled microfluidic static trap approach study LLPS efflorescence phenomenon ternary...
Quantifying changes in the properties of smoke aerosols under varying conditions is important for understanding health and environmental impacts exposure to smoke. Smoke composition, aerosol liquid water content, effective density (ρeff), other can change significantly as travels through areas different ambient over time. During this study, we measured composition physical due oxidative aging humidity. We found that led SOA formation increases ratios organic carbon elemental carbon. Aerosol...
The interaction of water vapor and the uptake behavior atmospheric particles are often investigated as a function relative humidity (0-100% RH) at ambient temperature. However, lower temperature studies important to understand how nucleate ice through various mechanisms including immersion freezing. Immersion freezing requires formation condensed droplet temperatures prior To better low-temperature marine biologically relevant particles, we have single using micro-Raman spectrometer coupled...
Herein, we measure the water structure for individual micron-sized droplets of water, salt and containing biologically marine relevant atmospheric inclusions as a function temperature. Individual droplets, formed on hydrophobic substrate, are analyzed with micro-Raman spectroscopy. Analysis Raman spectra in O-H stretching region shows that equilibrium partially fully hydrogen-bonding interactions change temperature decreases up until there is phase transition to form ice. Using these...
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...
Previous time-integrated (2 h to 4 h) measurements show that total gas-phase water-soluble organic carbon (WSOC
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...