Person: Ye, Jianhuai
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Ye
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Jianhuai
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Ye, Jianhuai
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Publication Synergistic Uptake by Acidic Sulfate Particles of Gaseous Mixtures of Glyoxal and Pinanediol(American Chemical Society (ACS), 2020-08-25) Qin, Yi Ming; Ye, Jianhuai; Ohno, Paul E.; Lei, Yali; Wang, Junfeng; Liu, Pengfei; Thomson, Regan J.; Martin, Scot T.; OhnoPublication Fluorescence Aerosol Flow Tube Spectroscopy to Detect Liquid–Liquid Phase Separation(American Chemical Society (ACS), 2021-05-06) Ohno, Paul; Qin, Yi Ming; Ye, Jianhuai; Wang, Junfeng; Bertram, Allan; Martin, ScotThe phase behavior of atmospheric aerosol particles influences processes like gas-particle partitioning, solar light scattering, and cloud formation, ultimately affecting atmospheric air quality and climate. An important aspect of this phase behavior is whether an individual particle exists in a single homogenous phase or undergoes liquid-liquid phase separation (LLPS). Herein, fluorescence aerosol flow tube (F-AFT) spectroscopy is developed to characterize LLPS in aerosolized submicron particles of 100 to 200 nm. A solvatochromic fluorescent probe molecule is incorporated into the particles. The link between its fluorescence emission and the local particle-phase chemical environment is used to determine the separation relative humidity (SRH) at which LLPS occurs. The LLPS behaviors of mixed organic/inorganic particles composed of polyethylene glycol (PEG), ammonium sulfate (AS), and sodium chloride (NaCl) are characterized. PEG/AS particles undergo LLPS at SRH values that vary with PEG composition. By comparison, PEG/NaCl particles continue as a single homogenous phase to the RH of NaCl crystallization. The SRH values for the submicron particles are >5% RH lower than those reported in the literature of supermicron particles deposited to substrate surfaces. Possible reasons for the differences are discussed, including kinetic and thermodynamic effects of system size and foreign substrate as well as observation time in the experimental apparatus.Publication Vertical Profiling of Fine Particulate Matter and Black Carbon by Using Unmanned Aerial Vehicle in Macau, China(Elsevier BV, 2020-03) Liu, Ben; Wu, Cheng; Ma, Nan; Ye, Jianhuai; Lin, Yong Jie; Chen, Qi; Martin, Scot; Li, YaoweiAn unmanned aerial vehicle 1 (UAV) equipped with miniature monitors was used to study the vertical profiles of PM2.5 (particulate matter [PM] with a ≤2.5-μm diameter) and black carbon (BC) in Macau, China, from the surface to 500 m above ground level (AGL). Twelve- and 11-day measurements were conducted during February and March 2018, respectively. In total, 46 flights were conducted between 05:00 and 06:00 AM Local Time (LT) during the measurement days. The average concentrations of PM2.5 and BC were significantly lower in March (40.1 ± 17.9 and 2.3 ± 2.0 μg m−3 , respectively) when the easterly winds dominantly prevailed compared with the concentrations in February (69.8 ± 35.7 and 3.6 ± 2.0 μg m−3, respectively) when the northerly winds typically occurred. In general, PM2.5 concentrations decreased with height. A vertical decrement of 0.2 μg m−3 was observed per 10 m. BC concentrations exhibited diverse vertical profiles with an overall vertical decrement of 0.1 μg m−3 per 10 m. Meteorological analyses including back-trajectory analysis and atmospheric stability categorization (i.e., Pasquill stability class) revealed that both advection and convection transports may have notable influences on the vertical profiles of PM pollutants. The near-surface accumulation of PM pollutants is positively associated with atmospheric stability. The height of the planetary boundary layer influences atmospheric dispersion. In our study, the concentration of PM pollutants above the boundary layer was lower than that below the layer, thus exhibiting a sigmoid profile in some cases. The air mass origin and vertical wind influences the vertical profiles of the PM pollutants, particularly when the atmosphere was neutral. We presented that primary emissions, such as those from nearby fishing vessels, lighting of firecrackers and fireworks during the Chinese New Year (CNY), and the takeoff of civil flights from a nearby airport, may affect the vertical profiles of the PM pollutants and CO in different ways. In particular, the lighting of firecrackers and fireworks on February 16 (first day of the CNY) resulted in the elevated concentrations of PM2.5 and BC within 150 m AGL and the pronounced accumulation of CO at approximately 400 m AGL. The takeoff of a civilian flight on February 10 may have resulted in a substantial increase in the PM2.5 concentrations from 80.8 (±2.1) μg m−3 at the ground level to 119.2 (±9.3) μg m−3 at a height of 330 m. Although the results are confined to a height of 500 m AGL, the current study provides a rich dataset for PM vertical distributions along with explanations of its possible causes rather than the more commonly investigated spatiotemporal variations by conducting ground-based measurements.Publication Near-canopy horizontal concentration heterogeneity of semivolatile oxygenated organic compounds and implications for 2-methyltetrols primary emissions(Royal Society of Chemistry (RSC), 2021) Ye, Jianhuai; Batista, Carla E.; Guimarães, Patricia C.; Ribeiro, Igor O.; Vidoudez, Charles; Barbosa, Rafael G.; Oliveira, Rafael L.; Ma, Yongjing; Jardine, Kolby J.; Surratt, Jason D.; Guenther, Alex B.; Souza, Rodrigo A. F.; Martin, Scot T.This study calls attention to the primary emissions of semivolatile oxygenated organic compounds (SV-OVOCs) and demonstrates how mapping out the near-canopy concentration can effectively isolate atmospheric SV-OVOC production from direct emissions.