Aging of Volatile Organic Compounds in October 2017 Northern California Wildfire Plumes DOI
Yutong Liang,

Robert J. Weber,

Pawel K. Misztal

и другие.

Environmental Science & Technology, Год журнала: 2022, Номер 56(3), С. 1557 - 1567

Опубликована: Янв. 17, 2022

In the western United States, number and severity of large wildfires have been growing for decades. Biomass burning (BB) is a major source volatile organic compounds (VOCs) to atmosphere both globally regionally. Following emission, BB VOCs are oxidized while being transported downwind, producing ozone, secondary aerosols, hazardous VOCs. this research, we measured using proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) in an urban area 55–65 km downwind October 2017 Northern California wildfires. Nonaromatic oxygenated were dominant component measured. smoke plumes, account 70–75% total observed carbon, with remainder particulate matter (with diameter <2.5 μm, PM2.5). We show that correlation furan (primary VOC) maleic anhydride (secondary can indicate origin This was further confirmed by diurnal variations their concentration-weighted trajectories. Oxidation during transport consumed highly reactive including benzenoids, furanoids, terpenoids produced more Furthermore, wildfire altered ozone formation regime raised O3 levels San Francisco Bay Area.

Язык: Английский

Look Up: Probing the Vertical Profile of New Particle Formation and Growth in the Planetary Boundary Layer With Models and Observations DOI Creative Commons
Samuel E. O’Donnell, Ali Akherati, Yicong He

и другие.

Journal of Geophysical Research Atmospheres, Год журнала: 2023, Номер 128(3)

Опубликована: Янв. 20, 2023

Abstract The processes of new particle formation (NPF) and growth are important contributors to cloud condensation nuclei (CCN) concentrations, CCN for climate from their impact on planetary radiative forcing. While the general ubiquity importance NPF is understood, vertical extent governing mechanisms in lower troposphere uncertain. We present an analysis four events two non‐NPF during HI‐SCALE field campaign at Southern Great Plains observatory Oklahoma, USA. First, we analyzed airborne ground‐based observations aerosol gas‐phase properties. Second, used a column chemistry microphysics model probe factors that influence profile NPF. During HI‐SCALE, found several instances enhanced occurring hundred meters above surface; however, spatio‐temporal characteristics observed made comparisons between airborne‐ difficult. represented (or lack NPF) surface final diameters within 10 nm. predicted rates upper mixed layer, this enhancement primarily due temperature dependence schemes, but was also dependent precursors measured HI‐SCALE. mixing either or suppressed rates, number surface. Finally, our provides insights future campaigns modeling efforts investigating

Язык: Английский

Процитировано

15
Viscosity, Glass Formation, and Mixing Times within Secondary Organic Aerosol from Biomass Burning Phenolics DOI
Kristian J. Kiland, Fabian Mahrt, Long Peng

и другие.

ACS Earth and Space Chemistry, Год журнала: 2023, Номер 7(7), С. 1388 - 1400

Опубликована: Июнь 13, 2023

Biomass burning events emit large amounts of phenolic compounds, which are oxidized in the atmosphere and form secondary organic aerosol (SOA). Using poke-flow technique, we measured relative humidity (RH)-dependent viscosities SOA generated by oxidation three biomass compounds: catechol, guaiacol, syringol. All systems had viscosity < 3 × 103 Pa s at RH ≳ 40% > 2 108 ≲ 3% room temperature. At values 0–10%, these were least orders magnitude higher than primary from burning. We also developed a parameterization for predicting as function Based on this parameterization, is strongly dependent both Under dry conditions, highly viscous temperature (∼109 s) becomes glass (viscosity 1012 when 280 K. For tropospheric values, often liquid state (η 102 below ∼2 km altitude, semi-solid (102 η between ∼9 km, glassy above km. Furthermore, mixing time molecules 200 nm particle exceeds 1 h troposphere.

Язык: Английский

Процитировано

15
Secondary Organic Aerosol Formation from Volatile Chemical Product Emissions: Model Parameters and Contributions to Anthropogenic Aerosol DOI
Sreejith Sasidharan, Yicong He, Ali Akherati

и другие.

Environmental Science & Technology, Год журнала: 2023, Номер 57(32), С. 11891 - 11902

Опубликована: Авг. 1, 2023

Volatile chemical products (VCP) are an increasingly important source of hydrocarbon and oxygenated volatile organic compound (OVOC) emissions to the atmosphere, these likely play role as anthropogenic precursors for secondary aerosol (SOA). While SOA from VCP hydrocarbons is often accounted in models, formation, evolution, properties OVOCs remain uncertain. We use environmental chamber data a kinetic model develop parameters 10 representing glycols, glycol ethers, esters, aromatics, amines. Model simulations suggest that mass yields same magnitude widely studied (e.g., long-chain alkanes, monoterpenes, single-ring aromatics), exhibit linear correlation with carbon number precursor. When combined inventories two megacities United States (US) US-wide inventory, we find VOCs react OH form 0.8–2.5× much SOA, by mass, mobile sources. Hydrocarbons (terpenes, branched cyclic alkanes) (terpenoids, ethers) make up 60–75 25–40% arising use, respectively. This work contributes growing body knowledge focused on studying VOC contributions urban air pollution.

Язык: Английский

Процитировано

15
Intense formation of secondary ultrafine particles from Amazonian vegetation fires and their invigoration of deep clouds and precipitation DOI Creative Commons
Manish Shrivastava, Jiwen Fan, Yuwei Zhang

и другие.

One Earth, Год журнала: 2024, Номер 7(6), С. 1029 - 1043

Опубликована: Июнь 1, 2024

New particle formation (NPF) in fire smoke is thought to be unlikely due large condensation and coagulation sinks that scavenge molecular clusters. We analyze aircraft measurements over the Amazon find fires significantly enhance NPF ultrafine (UFP < 50 nm diameter) numbers compared background conditions, contrary previous understanding. identify nucleation of dimethylamine with sulfuric acid, which aided by extremely low volatility organics biomass-burning smoke, can overcome explain observations. show freshly formed clusters rapidly grow UFP sizes through secondary organic aerosol formation, leading a 10-fold increase number concentrations. contrasting effect UFPs on deep convective clouds larger particles from primary emissions for case investigated here. intensify precipitation increased condensational heating, while delay reduce precipitation.

Язык: Английский

Процитировано

6
Aging of Volatile Organic Compounds in October 2017 Northern California Wildfire Plumes DOI
Yutong Liang,

Robert J. Weber,

Pawel K. Misztal

и другие.

Environmental Science & Technology, Год журнала: 2022, Номер 56(3), С. 1557 - 1567

Опубликована: Янв. 17, 2022

In the western United States, number and severity of large wildfires have been growing for decades. Biomass burning (BB) is a major source volatile organic compounds (VOCs) to atmosphere both globally regionally. Following emission, BB VOCs are oxidized while being transported downwind, producing ozone, secondary aerosols, hazardous VOCs. this research, we measured using proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) in an urban area 55–65 km downwind October 2017 Northern California wildfires. Nonaromatic oxygenated were dominant component measured. smoke plumes, account 70–75% total observed carbon, with remainder particulate matter (with diameter <2.5 μm, PM2.5). We show that correlation furan (primary VOC) maleic anhydride (secondary can indicate origin This was further confirmed by diurnal variations their concentration-weighted trajectories. Oxidation during transport consumed highly reactive including benzenoids, furanoids, terpenoids produced more Furthermore, wildfire altered ozone formation regime raised O3 levels San Francisco Bay Area.

Язык: Английский

Процитировано

23