Christopher D. Cappa
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View article: Reconciling measurements of black carbon in a cold and dark urban environment: Insights from the ALPACA 2022 campaign in Fairbanks, Alaska
Reconciling measurements of black carbon in a cold and dark urban environment: Insights from the ALPACA 2022 campaign in Fairbanks, Alaska Open
View article: Airborne Hexavalent Chromium Nanoparticles Detected Around Cleanup Zones for the 2025 Los Angeles Wildfires
Airborne Hexavalent Chromium Nanoparticles Detected Around Cleanup Zones for the 2025 Los Angeles Wildfires Open
The 2025 Eaton and Palisades fires in Los Angeles exemplify destructive wildfires that increasingly threaten cities across the globe. The dangers during active burning are obvious, but the threats to public health during the post-burn clea…
View article: Wind-driven emission of marine ice-nucleating particles in the Scripps Ocean-Atmosphere Research Simulator (SOARS)
Wind-driven emission of marine ice-nucleating particles in the Scripps Ocean-Atmosphere Research Simulator (SOARS) Open
Sea spray aerosol (SSA) represents one of the most abundant natural aerosol types, contributing significantly to global aerosol mass and aerosol optical depth, as well as to both the magnitude of and the uncertainty in aerosol radiative fo…
View article: Kinetic Modeling of Secondary Organic Aerosol in a Weather-Chemistry Model: Parameterizations, Processes, and Predictions for GOAmazon
Kinetic Modeling of Secondary Organic Aerosol in a Weather-Chemistry Model: Parameterizations, Processes, and Predictions for GOAmazon Open
Secondary organic aerosol (SOA) forms and evolves in the atmosphere through many pathways and processes, over diverse spatial and time scales. Hence, there is a need to represent these widely-varying kinetic processes in large-scale atmosp…
View article: Longevity of size-dependent particle removal performance of do-it-yourself box fan air filters
Longevity of size-dependent particle removal performance of do-it-yourself box fan air filters Open
Filtration performance of do-it-yourself (DIY) box fan air filters deployed across a university campus was assessed over an academic year.
View article: Wind-driven Emission of Marine Ice Nucleating Particles in the Scripps Ocean-Atmosphere Research Simulator (SOARS)
Wind-driven Emission of Marine Ice Nucleating Particles in the Scripps Ocean-Atmosphere Research Simulator (SOARS) Open
Sea spray aerosol (SSA) represent one of the most abundant natural aerosol types, contributing significantly to global aerosol mass and aerosol optical depth, as well as to both the magnitude and uncertainty of aerosol radiative forcing. I…
View article: Thank You to Our 2023 Peer Reviewers
Thank You to Our 2023 Peer Reviewers Open
On behalf of the journal, AGU, and the scientific community, the editors of Geophysical Research Letters would like to sincerely thank those who reviewed manuscripts for us in 2023. The hours reading and commenting on manuscripts not only …
View article: Chemical properties and single-particle mixing state of soot aerosol in Houston during the TRACER campaign
Chemical properties and single-particle mixing state of soot aerosol in Houston during the TRACER campaign Open
A high-resolution soot particle aerosol mass spectrometer (SP-AMS) was used to selectively measure refractory black carbon (rBC) and its associated coating material using both the ensemble size-resolved mass spectral mode and the event tri…
View article: Formation of secondary organic aerosol from wildfire emissions enhanced by long-time ageing
Formation of secondary organic aerosol from wildfire emissions enhanced by long-time ageing Open
View article: Multi-day photochemical evolution of organic aerosol from biomass burning emissions
Multi-day photochemical evolution of organic aerosol from biomass burning emissions Open
Our work highlights how organic compounds in smoke particles will undergo physical and chemical transformations in the presence of sunlight as the smoke is transported over long distances.
View article: Optimization of Ventilation and Filtration System Operation in Classrooms to Minimize Airborne Infectious Disease Transmission, Particulate Matter Exposure, and Energy Consumption
Optimization of Ventilation and Filtration System Operation in Classrooms to Minimize Airborne Infectious Disease Transmission, Particulate Matter Exposure, and Energy Consumption Open
View article: Comment on egusphere-2023-2328
Comment on egusphere-2023-2328 Open
Abstract. A high-resolution soot particle aerosol mass spectrometer (SP-AMS) was used to selectively measure refractory black carbon (rBC) and its associated coating material using both the ensemble size-resolved mass spec…
View article: Source apportionment of soot particles and aqueous-phase processing of black carbon coatings in an urban environment
Source apportionment of soot particles and aqueous-phase processing of black carbon coatings in an urban environment Open
The impacts of soot particles on climate and human health depend on the concentration of black carbon (BC) as well as the thickness and composition of the coating material, i.e., organic and inorganic compounds internally mixed with BC. In…
View article: Method of test for CO2-based demand control ventilation systems: Benchmarking the state-of-the-art and the undervalued potential of proportional-integral control
Method of test for CO2-based demand control ventilation systems: Benchmarking the state-of-the-art and the undervalued potential of proportional-integral control Open
Carbon dioxide (CO2) based demand control ventilation (DCV) adjusts a building's outdoor air ventilation rate in response to indoor CO2 concentration to save energy while maintaining indoor air quality. Packaged heating, ventilation, and a…
View article: Chemical Properties and Single Particle Mixing State of Soot Aerosol in Houston during the TRACER Campaign
Chemical Properties and Single Particle Mixing State of Soot Aerosol in Houston during the TRACER Campaign Open
A high-resolution soot particle aerosol mass spectrometer (SP-AMS) was used to selectively measure refractory black carbon (rBC) and its associated coating material using both the ensemble size-resolved mass spectral mode and the event tri…
View article: Supplementary material to "Chemical Properties and Single Particle Mixing State of Soot Aerosol in Houston during the TRACER Campaign"
Supplementary material to "Chemical Properties and Single Particle Mixing State of Soot Aerosol in Houston during the TRACER Campaign" Open
View article: Comment on egusphere-2023-1818
Comment on egusphere-2023-1818 Open
Abstract. The impacts of soot particles on climate and human health depend on the concentration of black carbon (BC) as well as the thickness and composition of the coating material, i.e., organic and inorganic compounds i…
View article: Source Apportionment of Soot Particles and Aqueous-Phase Processing of Black Carbon Coatings in an Urban Environment
Source Apportionment of Soot Particles and Aqueous-Phase Processing of Black Carbon Coatings in an Urban Environment Open
The impacts of soot particles on climate and human health depend on the concentration of black carbon (BC) as well as the thickness and composition of the coating material, i.e., organic and inorganic compounds internally mixed with BC. In…
View article: Supplementary material to "Source Apportionment of Soot Particles and Aqueous-Phase Processing of Black Carbon Coatings in an Urban Environment"
Supplementary material to "Source Apportionment of Soot Particles and Aqueous-Phase Processing of Black Carbon Coatings in an Urban Environment" Open
View article: TRACER Carbonaceous Aerosols Thrust – University of California, Davis Field Campaign Report
TRACER Carbonaceous Aerosols Thrust – University of California, Davis Field Campaign Report Open
The broader U.S. Department of Energy Atmospheric Radiation Measurement (ARM) user facility’s TRacking Aerosol Convection interactions ExpeRiment (TRACER) campaign aims to increase our understanding of convective cloud life cycles and aero…
View article: Evolution of organic carbon in the laboratory oxidation of biomass-burning emissions
Evolution of organic carbon in the laboratory oxidation of biomass-burning emissions Open
Biomass burning (BB) is a major source of reactive organic carbon into the atmosphere. Once in the atmosphere, these organic BB emissions, in both the gas and particle phases, are subject to atmospheric oxidation, though the nature and imp…
View article: Thank You to Our 2022 Peer Reviewers
Thank You to Our 2022 Peer Reviewers Open
On behalf of the journal, AGU, and the scientific community, the editors of Geophysical Research Letters would like to sincerely thank those who reviewed manuscripts for us in 2022. The hours reading and commenting on manuscripts not only …
View article: Comment on acp-2022-857
Comment on acp-2022-857 Open
Abstract. Biomass burning (BB) is a major source of reactive organic carbon into the atmosphere. Once in the atmosphere, these organic BB emissions, in both the gas and particle phases, are subject to atmospheric oxidation…
View article: Issue Information
Issue Information Open
No abstract is available for this article.
View article: Supplementary material to "Evolution of Organic Carbon in the Laboratory Oxidation of Biomass Burning Emissions"
Supplementary material to "Evolution of Organic Carbon in the Laboratory Oxidation of Biomass Burning Emissions" Open
View article: Evolution of Organic Carbon in the Laboratory Oxidation of Biomass Burning Emissions
Evolution of Organic Carbon in the Laboratory Oxidation of Biomass Burning Emissions Open
Biomass burning (BB) is a major source of reactive organic carbon into the atmosphere. Once in the atmosphere, these organic BB emissions, in both the gas and particle phases, are subject to atmospheric oxidation, though the nature and imp…
View article: Effect of relative humidity, NO<sub><i>x</i></sub>, and ammonia on the physical properties of naphthalene secondary organic aerosols
Effect of relative humidity, NO<sub><i>x</i></sub>, and ammonia on the physical properties of naphthalene secondary organic aerosols Open
Relative humidity, NO x , and NH 3 can all alter the molecular, optical, and hygroscopic properties of naphthalene SOAs, with a complex synergy between these factors.
View article: TRACER-CAT-UCDAVIS Aerosol Optical Properties and Sizing - smps
TRACER-CAT-UCDAVIS Aerosol Optical Properties and Sizing - smps Open
Aerosol size distribution and optical properties collected in La Port TX, during TRACER-CAT-UCDavis, July 2022. Speciated particle composition measurements are reported separately. All sampling was conducted with an identical aerosol inlet…
View article: Method of Test for Co2-Based Demand Control Ventilation Systems: Benchmarking the State-of-The-Art and the Undervalued Potential of Proportional-Integral Control
Method of Test for Co2-Based Demand Control Ventilation Systems: Benchmarking the State-of-The-Art and the Undervalued Potential of Proportional-Integral Control Open
View article: Atmospheric oxidation impact on sea spray produced ice nucleating particles
Atmospheric oxidation impact on sea spray produced ice nucleating particles Open
Ice nucleating particles (INPs) in sea spray aerosol (SSA) are important for ice formation in clouds over oceans. We found that SSA INP concentrations during a phytoplankton bloom were degraded with exposure to 3 to 8 days of atmospheric o…