A5005451060- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Advanced Chemical Sensor Technologies
- Hydrocarbon exploration and reservoir analysis
- Fire effects on ecosystems
- Atmospheric aerosols and clouds
- Energy and Environment Impacts
- Methane Hydrates and Related Phenomena
- Oil Spill Detection and Mitigation
- Odor and Emission Control Technologies
- Toxic Organic Pollutants Impact
- Olfactory and Sensory Function Studies
- Energy, Environment, and Transportation Policies
- Water Quality Monitoring and Analysis
- Marine and coastal ecosystems
- Cryospheric studies and observations
- COVID-19 impact on air quality
- Spectroscopy and Laser Applications
- Biochemical Analysis and Sensing Techniques
- Inhalation and Respiratory Drug Delivery
- Ionosphere and magnetosphere dynamics
University of California, Irvine
2016-2025
University of California, Los Angeles
2020
UC Irvine Health
2016
Irvine University
2013
Molecular Sciences Institute
2013
Langley Research Center
2009
University of Miami
2009
University of Minnesota
2009
University of California, Berkeley
2009
University of California System
2008
Abstract The Community Earth System Model version 2 (CESM2) includes a detailed representation of chemistry throughout the atmosphere in Atmosphere with and Whole Climate configurations. These model configurations use for Ozone Related chemical Tracers (MOZART) family mechanisms, covering troposphere, stratosphere, mesosphere, lower thermosphere. new MOZART tropospheric scheme (T1) has number updates over previous (MOZART‐4) CESM, including improvements to oxidation isoprene terpenes,...
Abstract. This paper presents the first results of measurements trace gases and aerosols at three surface sites in outside Beijing before during 2008 Olympics. The official air pollution index near Olympic Stadium data from our nearby site revealed an obvious association between quality meteorology different responses secondary primary pollutants to control measures. Ambient concentrations vehicle-related nitrogen oxides (NOx) volatile organic compounds (VOCs) urban dropped by 25% 20–45% two...
Dimethyl sulfide (DMS), emitted from the oceans, is most abundant biological source of sulfur to marine atmosphere. Atmospheric DMS oxidized condensable products that form secondary aerosols affect Earth's radiative balance by scattering solar radiation and serving as cloud condensation nuclei. We report atmospheric discovery a previously unquantified oxidation product, hydroperoxymethyl thioformate (HPMTF, HOOCH2SCHO), identified through global-scale airborne observations demonstrate it be...
Abstract Wildfires emit significant amounts of pollutants that degrade air quality. Plumes from three wildfires in the western U.S. were measured aircraft during Studies Emissions and Atmospheric Composition, Clouds Climate Coupling by Regional Surveys (SEAC 4 RS) Biomass Burning Observation Project (BBOP), both summer 2013. This study reports an extensive set emission factors (EFs) for over 80 gases 5 components submicron particulate matter (PM 1 ) these temperate wildfires. These include...
Detailed airborne, surface, and subsurface chemical measurements, primarily obtained in May June 2010, are used to quantify initial hydrocarbon compositions along different transport pathways (i.e., deep plumes, the surface slick, atmosphere) during Deepwater Horizon oil spill. Atmospheric measurements consistent with a limited area of surfacing oil, implications for leaked mass drop size distributions. The data further suggest relatively little variation leaking composition over time....
Abstract. Boreal regions comprise about 17 % of the global land area, and they both affect are influenced by climate change. To better understand boreal forest fire emissions plume evolution, 947 whole air samples were collected aboard NASA DC-8 research aircraft in summer 2008 as part ARCTAS-B field mission, analyzed for 79 non-methane volatile organic compounds (NMVOCs) using gas chromatography. Together with simultaneous measurements CO2, CO, CH4, CH2O, NO2, NO, HCN CH3CN, these represent...
Abstract. In October–November 2011 we measured trace gas emission factors from seven prescribed fires in South Carolina (SC), US, using two Fourier transform infrared spectrometer (FTIR) systems and whole air sampling (WAS) into canisters followed by gas-chromatographic analysis. A total of 97 species were quantified both airborne ground-based platforms, making this one the most detailed field studies fire emissions to date. The measurements include first for a suite monoterpenes produced...
The concentration of nitrogen oxides (NOx) plays a central role in controlling air quality. On global scale, the primary sink NOx is oxidation to form HNO3. Gas-phase HNO3 photolyses slowly with lifetime troposphere 10 days or more. However, several recent studies examining HONO chemistry have proposed that particle-phase undergoes photolysis 10–300 times more rapidly than gas-phase We present here constraints on rate based observations and collected over Yellow Sea during KORUS-AQ study...
Abstract This article provides an overview of the NASA Atmospheric Tomography (ATom) mission and a summary selected scientific findings to date. ATom was airborne measurements modeling campaign aimed at characterizing composition chemistry troposphere over most remote regions Pacific, Southern, Atlantic, Arctic Oceans, examining impact anthropogenic natural emissions on global scale. These dominate chemical reactivity are exceptionally important for air quality climate. data provide in situ...
A large number of hydrocarbons, halocarbons, and organic nitrates were quantified in whole air samples acquired for the NASA-sponsored GTE missions PEM-Tropics B. The collected electro-polished stainless steel canisters from two aircraft while flying over Pacific Basin. Two nominally identical multicolumn multidetector gas chromatographic analytical systems employed. Whole also used as working calibrated standards specifically this purpose. This paper describes procedure employed during...
Abstract. Oil sands comprise 30% of the world's oil reserves and crude in Canada's deposits are second only to Saudi Arabia. The extraction processing is much more challenging than for light sweet oils because high viscosity bitumen contained within mixed with sand contains chemical impurities such as sulphur. Despite these challenges, importance increasing energy market. To our best knowledge this first peer-reviewed study characterize volatile organic compounds (VOCs) emitted from...
Prescribed burning is a significant source of fine particulate matter (PM2.5) in the southeastern United States. However, limited data exist on emission characteristics from this source. Various organic and inorganic compounds both gas particle phase were measured emissions prescribed burnings conducted at two pine-dominated forest areas Georgia. The measurements volatile (VOCs) PM2.5 allowed determination factors for flaming smoldering stages burnings. VOC distinctly higher than those...
Background: Many volatile organic compounds are present in exhaled breath and may represent by-products of endogenous biological processes. Ethanol is produced via alcoholic fermentation glucose by gut bacteria yeast, while acetone derives from oxidations free fatty acids, influenced metabolism. We hypothesized that the integrated analysis ethanol would provide a good approximation blood profile during load. Methods: collected simultaneous gas, ambient air, serum insulin samples 10 healthy...
We analyze 16‐month data of 13 major halocarbons measured at a southern China coastal site in the greater Pearl River Delta (PRD). A total 188 canister air samples were collected from August 2001 to December 2002. Overall inspection indicated that CH 2 Cl , C 4 and HCl 3 had similar temporal variations while CFC‐11, CFC‐12, CFC‐113 showed same emission patterns during sampling period. Diurnal presented different ozone episode days, mainly related strength, atmospheric dispersion,...
We present an overview of the spatial distributions nonmethane hydrocarbons (NMHCs) and halocarbons observed over western north Pacific as part NASA GTE Transport Chemical Evolution (TRACE‐P) airborne field campaign (February–April 2001). The TRACE‐P data are compared with earlier measurements from Rim during Exploratory Mission‐West B (PEM‐West B), which took place in February–March 1994, emission inventory for 2000. Despite limited temporal coverage inherent to sampling, mean levels...
Secondary organic aerosol (SOA) formation from in-use vehicle emissions was investigated using a potential mass (PAM) flow reactor deployed in highway tunnel Pittsburgh, Pennsylvania. Experiments consisted of passing exhaust-dominated air through PAM over integrated hydroxyl radical (OH) exposures ranging ∼0.3 to 9.3 days equivalent atmospheric oxidation. were performed during heavy traffic periods when the fleet at least 80% light-duty gasoline vehicles on fuel-consumption basis. The peak...
Recent technical advances allow detection of several hundred volatile organic compounds (VOCs) in human exhaled air, many which reflect unidentified endogenous pathways. Our group has previously estimated plasma glucose levels healthy adults during a standard oral tolerance test via VOC analysis. As result the metabolic characteristics hyperglycemia diabetic (low insulin and increased free fatty acids ketones), we hypothesized that different profiles may be present children with type 1...
Abstract Emissions from 15 agricultural fires in the southeastern U.S. were measured NASA DC‐8 research aircraft during summer 2013 Studies of and Atmospheric Composition, Clouds Climate Coupling by Regional Surveys (SEAC 4 RS) campaign. This study reports a detailed set emission factors (EFs) for 25 trace gases 6 fine particle species. The chemical evolution primary emissions seven plumes was examined detail ~1.2 h. A Lagrangian plume cross‐section model used to simulate ozone (O 3 ),...