Young Ro Lee
A5061823334- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Fire effects on ecosystems
- Atmospheric aerosols and clouds
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Laser Applications
- Analytical chemistry methods development
- Climate variability and models
- Ionosphere and magnetosphere dynamics
- Cardiovascular Function and Risk Factors
- Renal Transplantation Outcomes and Treatments
- Wind and Air Flow Studies
- Cardiac Structural Anomalies and Repair
- Advanced Chemical Sensor Technologies
- Pharmaceutical Economics and Policy
- Network Traffic and Congestion Control
- Meteorological Phenomena and Simulations
- Caching and Content Delivery
- Nuclear Physics and Applications
- Isotope Analysis in Ecology
- Mechanical Circulatory Support Devices
Georgia Institute of Technology
2019-2025
California Institute of Technology
2024
AID Atlanta
2020
National Information Society Agency
2003
Wildfires are a substantial but poorly quantified source of tropospheric ozone (O3). Here, to investigate the highly variable O3 chemistry in wildfire plumes, we exploit situ chemical characterization western wildfires during FIREX-AQ flight campaign and show that production can be predicted as function experimentally constrained OH exposure, volatile organic compound (VOC) reactivity, fate peroxy radicals. The exhibits rapid transition regimes. Within few daylight hours, formation...
Abstract. Extensive airborne measurements of non-methane organic gases (NMOGs), methane, nitrogen oxides, reduced species, and aerosol emissions from US wild prescribed fires were conducted during the 2019 NOAA/NASA Fire Influence on Regional to Global Environments Air Quality campaign (FIREX-AQ). Here, we report atmospheric enhancement ratios (ERs) inferred emission factors (EFs) for compounds measured board NASA DC-8 research aircraft nine wildfires one fire, which encompass a range...
Abstract. Wildfires are increasing in size across the western US, leading to increases human smoke exposure and associated negative health impacts. The impact of biomass burning (BB) smoke, including wildfires, on regional air quality depends emissions, transport, chemistry, oxidation emitted BB volatile organic compounds (BBVOCs) by hydroxyl radical (OH), nitrate (NO3), ozone (O3). During daytime, when light penetrates plumes, BBVOCs oxidized mainly O3 OH. In contrast, at night or optically...
Abstract The Asian Summer Monsoon (ASM) has garnered attention in recent years for its impacts on the composition of upper troposphere and lower stratosphere (UTLS) via deep convection. A observational effort into this mechanism, Chemical CLimate Impact Project (ACCLIP), sampled ASM UTLS over northwestern Pacific region during boreal summer 2022 using two airborne platforms. In work, we integrate Lagrangian trajectory modeling with convective cloud top observations to diagnose transport...
Abstract Wildland fires involve complicated processes that are challenging to represent in chemical transport models. Recent airborne measurements reveal remarkable tomography fresh wildland fire plumes, which remain yet be fully explored using Here, we present a high‐resolution large eddy simulation model coupled chemistry study the evolution plume. The is configured for heavily sampled during Fire Influence on Regional Global Environments and Air Quality field campaign, variety of used...
We present a novel method, the Gaussian observational model for edge to center heterogeneity (GOMECH), quantify horizontal chemical structure of plumes. GOMECH fits observations short-lived emissions or products against long-lived tracer (e.g., CO) provide relative metrics plume width (wi/wCO) and (bi/wCO). To validate GOMECH, we investigate OH NO3 oxidation processes in smoke plumes sampled during FIREX-AQ (Fire Influence on Regional Global Environments Air Quality, 2019 wildfire study). An...
Abstract. We present a comparison of fast-response instruments installed onboard the NASA DC-8 aircraft that measured nitrogen oxides (NO and NO2), nitrous acid (HONO), total reactive odd (measured both as (NOy) from sum individually species (ΣNOy)), carbon monoxide (CO) in troposphere during 2019 Fire Influence on Regional to Global Environments Air Quality (FIREX-AQ) campaign. By targeting smoke summertime wildfires, prescribed fires, agricultural burns across continental United States,...
Abstract. To investigate the impact of aging on sources, volatility, and viscosity organic aerosol (OA) in Chinese outflows, a high-resolution time-of-flight mass spectrometer (HR-AMS) coupled with thermodenuder (TD) was deployed spring 2018 Dongying, which is regional receptor site metropolitan emissions North China Plain (NCP). The average concentration PM1 31.5±22.7 µg m−3, mainly composed nitrate (33 %) OA (25 %). source apportionment results show that contributed by oxygenated (OOA)...
Abstract. Nitryl chloride (ClNO2) is a radical reservoir species that releases chlorine radicals upon photolysis. An integrated analysis of the impact ClNO2 on regional photochemistry in Seoul metropolitan area (SMA) during Korea–United States Air Quality Study (KORUS-AQ) 2016 field campaign presented. Comprehensive multiplatform observations were conducted aboard NASA DC-8 and at two ground sites (Olympic Park, OP; Taehwa Research Forest, TRF), representing an urbanized forested suburban...
Abstract. A new ion source (IS) utilizing vacuum ultraviolet (VUV) light is developed and characterized for use with iodide–chemical ionization mass spectrometers (I−-CIMS). The VUV-IS utilizes a compact krypton lamp that emits at two wavelengths corresponding to energies of ∼10.030 10.641 eV. VUV photoionizes either methyl iodide (ionization potential, IP = 9.54 ± 0.02 eV) or benzene (IP 9.24378 0.00007 form cations photoelectrons. electrons react I−, which serves as the reagent CIMS. by...
Abstract. The fraction of urban volatile organic compound (VOC) emissions attributable to fossil fuel combustion has been declining in many parts the world, resulting a need better constrain other anthropogenic sources these emissions. During National Institute Environmental Research (NIER) and Aeronautics Space Administration (NASA) Korea-United States Air Quality (KORUS-AQ) field study Seoul, South Korea, during May–June 2016, air quality models underestimated ozone, formaldehyde,...
Abstract An extensive set of primary and secondary pollutants was measured at a ground site in remote location the Yellow River Delta, China during Ozone Photochemistry Export from Experiment (OPECE) March to April 2018. The measurements include volatile organic compounds (VOCs), peroxyacyl nitrates (PANs), ozone (O 3 ), particulate species, nitrogen oxides (NO x SO 2 . Observed VOC mixing ratios were comparable those heavily polluted cities U.S. China. source signatures suggest strong...
Abstract. Extensive airborne measurements of non-methane organic gases (NMOGs), methane, nitrogen oxides, reduced nitrogen-species, and aerosol emissions from US wild prescribed fires were conducted during the 2019 NOAA/NASA Fire Influence on Regional to Global Environments Air Quality campaign (FIREX-AQ). Here, we report atmospheric enhancement ratios (ERs) inferred emission factors (EFs) for compounds measured onboard NASA DC-8 research aircraft nine wildfires one fire, which encompass a...
Abstract. Most I−-CIMSs (iodide chemical ionization mass spectrometers) for measurement of atmospheric trace gases utilize a radioactive ion source with an initial activity 10 or 20 mCi 210Po. In this work, we characterize 210Po 1.5 that can be easily constructed from commercially available components. The low level significantly reduces regulatory burden storage and shipping relative to higher-activity sources. We compare the sensitivity low-activity (LAS) standard source, as function...
Abstract. We present a comparison of fast-response instruments installed onboard the NASA DC-8 aircraft that measured nitrogen oxides (NO and NO2), nitrous acid (HONO), total reactive odd (measured both as (NOy) from sum individually species (SNOy)) carbon monoxide (CO) in troposphere during 2019 Fire Influence on Regional to Global Environments Air Quality (FIREX-AQ) campaign. By targeting smoke summertime wildfires, prescribed fires agricultural burns across continental United States,...
Emissions and secondary photochemical products from the Daesan petrochemical complex (DPCC), on west coast of South Korea, were measured NASA DC-8 research aircraft during Korea-United States Air Quality campaign in 2016. The chemical evolution emissions was examined utilizing near-source downwind plume transects. Small alkenes, such as ethene (C2H4), propene (C3H6), 1,3-butadiene (C4H6), dominated hydroxyl (OH) radical reactivity near source region. oxidation these alkenes plumes led to...
N/A ACRO2 C3H5O4 105.07 STYR C8H8/ styrene 104.15 Is_Advected: true EBZ C8H10/ethylbenzene
Abstract. Ozone (O3) is an important secondary pollutant that impacts air quality and human health. Eastern Asia has high regional O3 background due to the numerous sources increasing rapid industrial growth, which also Seoul Metropolitan Area (SMA). However, SMA been experiencing driven by decreasing NOx emissions, highlighting role of local in situ production on SMA. Here, comprehensive gas-phase measurements collected NASA DC-8 during National Institute Environmental Research (NIER)/NASA...
The Asian Summer Monsoon (ASM) has garnered attention in recent years for its impacts on the composition of upper troposphere and lower stratosphere (UTLS) via deep convection. A observational effort into this mechanism, summer monsoon Chemical CLimate Impact Project (ACCLIP), sampled ASM UTLS over northwestern Pacific during boreal 2022 using two airborne platforms. In work, we integrate Lagrangian trajectory modeling with convective cloud top observations to diagnose transport which...
Abstract. Wildfires are increasing in size across the western U.S., leading to increases human smoke exposure and associated negative health impacts. The impact of biomass burning (BB) smoke, including wildfires, on regional air quality depends emissions, transport, chemistry, oxidation emitted BB volatile organic compounds (BBVOCs) by hydroxyl radical (OH), nitrate (NO3), ozone (O3). During daytime, when light penetrates plumes, BBVOCs oxidized mainly O3 OH. In contrast, at night, or...
Abstract: Flow in the blood sac of Korean artificial heart is numerically simulated by finite element method. Fluid‐structure interaction algorithm employed to compute three‐dimensional flow interacting with material. For verification numerical method fluid‐structure interaction, two‐dimensional a collapsible channel initial tension and results are compared solutions from literature. Incompressible viscous linear elastic solid assumed for material device, respectively. The motion actuator...
We present trace gas vertical profiles observed by instruments on the NASA DC-8 and at a ground site during Korea-US air quality study (KORUS) field campaign in May to June 2016. focus region near Seoul metropolitan area its surroundings where both anthropogenic natural emission sources play an important role local photochemistry. Integrating airborne observations is major research goal of many atmospheric chemistry campaigns. Although platforms typically aim sample from surface free...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Atmospheres. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]Chemical Tomography Fresh Wildland Fire Plume: Large Eddy Simulation (LES) StudyAuthorsSiyuanWangiDMatthew MitchellCoggonGeorgios...
Abstract. The fraction of urban volatile organic compounds (VOC) emissions attributable to fossil fuel combustion has been declining in many parts the world, resulting a need better constrain other anthropogenic sources these emissions. During National Institute Environmental Research (NIER) and Aeronautics Space Administration (NASA) Korea-United States Air Quality (KORUS-AQ) field study Seoul, South Korea during May–June 2016, air quality models underestimated ozone, formaldehyde,...