A5004854303- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Fire effects on ecosystems
- Air Quality Monitoring and Forecasting
- Meteorological Phenomena and Simulations
- Vehicle emissions and performance
- Wind and Air Flow Studies
- Hydrocarbon exploration and reservoir analysis
- Aeolian processes and effects
- Climate variability and models
- Remote Sensing in Agriculture
- Ocean Acidification Effects and Responses
- Oil Spill Detection and Mitigation
- Ionosphere and magnetosphere dynamics
- Energy and Environment Impacts
- Solar Radiation and Photovoltaics
- Energy, Environment, and Transportation Policies
- Climate Change Policy and Economics
- Transportation Safety and Impact Analysis
- Fire dynamics and safety research
- Radiative Heat Transfer Studies
- Remote Sensing and Land Use
University of California, Los Angeles
2018-2025
Institute of the Environment
2018-2023
Dartmouth Hospital
2023
Dartmouth College
2023
Langley Research Center
2023
NOAA Oceanic and Atmospheric Research
2023
University of Iowa
2011-2021
NSF National Center for Atmospheric Research
2015-2018
Research Applications (United States)
2018
University of Chile
2009-2015
Abstract. The Weather Research and Forecasting model coupled with chemistry (WRF-Chem) is modified to include a volatility basis set (VBS) treatment of secondary organic aerosol formation. VBS approach, SAPRC-99 gas-phase mechanism, used gas-particle partitioning multiple generations oxidation vapors. In addition the detailed 9-species VBS, simplified mechanism using 2 species (2-species VBS) developed tested for similarity in terms both mass oxygen-to-carbon ratios aerosols atmosphere....
Abstract. Data assimilation is used in atmospheric chemistry models to improve air quality forecasts, construct re-analyses of three-dimensional chemical (including aerosol) concentrations and perform inverse modeling input variables or model parameters (e.g., emissions). Coupled meteorology (CCMM) are that simulate meteorological processes transformations jointly. They offer the possibility assimilate both data; however, because CCMM fairly recent, data has been limited date. We review here...
Abstract. Southern Africa produces almost a third of the Earth's biomass burning (BB) aerosol particles, yet fate these particles and their influence on regional global climate is poorly understood. ORACLES (ObseRvations Aerosols above CLouds intEractionS) 5-year NASA EVS-2 (Earth Venture Suborbital-2) investigation with three intensive observation periods designed to study key atmospheric processes that determine impacts aerosols. During Hemisphere winter spring (June–October), reaching 3–5...
Abstract. The online coupled Weather Research and Forecasting-Chemistry (WRF-Chem) model was applied to simulate a haze event that happened in January 2010 the North China Plain (NCP), validated against various types of measurements. evaluations indicate WRF-Chem provides reliable simulations for NCP. This mainly caused by high emissions air pollutants NCP stable weather conditions winter. Secondary inorganic aerosols also played an important role cloud chemistry had contributions. Air...
The Korea-United States Air Quality (KORUS-AQ) field study was conducted during May–June 2016 to understand the factors controlling air quality in South Korea. Extensive aircraft and ground network observations from campaign offer an opportunity address issues current models reduce model-observation disagreements. This examines these using model evaluation against KORUS-AQ intercomparisons between models. Six regional two global chemistry transport identical anthropogenic emissions...
Abstract The NOAA/NASA Fire Influence on Regional to Global Environments and Air Quality (FIREX‐AQ) experiment was a multi‐agency, inter‐disciplinary research effort to: (a) obtain detailed measurements of trace gas aerosol emissions from wildfires prescribed fires using aircraft, satellites ground‐based instruments, (b) make extensive suborbital remote sensing fire dynamics, (c) assess local, regional, global modeling fires, (d) strengthen connections observables the ground such as fuels...
The NASA Langley airborne second-generation High Spectral Resolution Lidar (HSRL-2) uses a density-tuned field-widened Michelson interferometer to implement the HSRL technique at 355 nm. optically separates received backscattered light between two channels, one of which is dominated by molecular backscattering, while other contains most particles. This achieves high and stable contrast ratio, defined as ratio particulate backscatter signal channels. We show that critical for precise accurate...
Abstract. An aerosol optical depth (AOD) three-dimensional variational data assimilation technique is developed for the Gridpoint Statistical Interpolation (GSI) system which WRF-Chem forecasts are performed with a detailed sectional model, Model Simulating Aerosol Interactions and Chemistry (MOSAIC). Within GSI, forward AOD adjoint sensitivities using Mie computations from properties module, providing consistency forecast. GSI tools such as recursive filters weak constraints used to provide...
Abstract. The colocation of clouds and smoke over the southeast Atlantic Ocean during southern African biomass burning season has numerous radiative implications, including microphysical modulation if is entrained into marine boundary layer. NASA's ObseRvations Aerosols above CLouds their intEractionS (ORACLES) campaign studying this system with aircraft in three field deployments between 2016 2018. Results from ORACLES-2016 show that relationship cloud droplet number concentration below...
Abstract Planned geostationary satellites will provide aerosol optical depth (AOD) retrievals at high temporal and spatial resolution which be incorporated into current assimilation systems that use low‐Earth orbiting (e.g., Moderate Resolution Imaging Spectroradiometer (MODIS)) AOD. The impacts of such additions are explored in a real case scenario using AOD from the Geostationary Ocean Color Imager (GOCI) on board Communication, Ocean, Meteorology Satellite, satellite observing northeast...
Abstract. Recently launched multichannel geostationary Earth orbit (GEO) satellite sensors, such as the Geostationary Ocean Color Imager (GOCI) and Advanced Himawari (AHI), provide aerosol products over East Asia with high accuracy, which enables monitoring of rapid diurnal variations transboundary transport aerosols. Most studies to date have used low (LEO) Moderate Resolution Imaging Spectroradiometer (MODIS) Multi-angle (MISR), a maximum one or two overpass daylight times per day from...
Abstract We couple airborne, ground‐based, and satellite observations; conduct regional simulations; develop apply an inversion technique to constrain hourly smoke emissions from the Rim Fire, third largest observed in California, USA. Emissions constrained with multiplatform data show notable nocturnal enhancements (sometimes over a factor of 20), correlate better daily burned area data, are 2–4 higher than priori estimates, highlighting need for improved characterization diurnal profiles...
Abstract. In this work, we investigate the NOx emissions inventory in Seoul, South Korea, using a regional ozone monitoring instrument (OMI) NO2 product derived from standard NASA product. We first develop OMI by recalculating air mass factors high-resolution (4 km × 4 km) WRF-Chem model simulation, which better captures profile shapes urban regions. then apply model-derived spatial averaging kernel to further downscale retrieval and account for subpixel variability. These two modifications...
Abstract. Southern Africa produces almost a third of the Earth’s biomass burning (BB) aerosol particles, yet fate these particles and their influence on regional global climate is poorly understood. ORACLES (ObseRvations Aerosols above CLouds intEractionS) five-year NASA EVS-2 (Earth Venture Suborbital-2) investigation with three Intensive Observation Periods designed to study key atmospheric processes that determine impacts aerosols. During Hemisphere winter spring (June-October), reaching...
Abstract. In the southeast Atlantic, well-defined smoke plumes from Africa advect over marine boundary layer cloud decks; both are most extensive around September, when of resides in free troposphere. A framework is put forth for evaluating performance a range global and regional atmospheric composition models against observations made during NASA ORACLES (ObseRvations Aerosols above CLouds their intEractionS) airborne mission September 2016. strength comparison focus on spatial distribution...
Abstract. NASA's Deriving Information on Surface Conditions from Column and Vertically Resolved Observations Relevant to Air Quality (DISCOVER-AQ, conducted in 2011–2014) campaign the United States joint NASA National Institute of Environmental Research (NIER) Korea–United Study (KORUS-AQ, 2016) South Korea were two field study programs that provided comprehensive, integrated datasets airborne surface observations atmospheric constituents, including nitrogen dioxide (NO2), with goal...
Abstract. Biomass burning smoke is advected over the southeastern Atlantic Ocean between July and October of each year. This plume overlies mixes into a region persistent low marine clouds. Model calculations climate forcing by this vary significantly in both magnitude sign. NASA EVS-2 (Earth Venture Suborbital-2) ORACLES (ObseRvations Aerosols above CLouds their intEractionS) had deployments for field campaigns off west coast Africa 3 consecutive years (September 2016, August 2017, 2018)...
Abstract. In southern Africa, widespread agricultural fires produce substantial biomass burning (BB) emissions over the region. The seasonal smoke plumes associated with these are then advected westward persistent stratocumulus cloud deck in southeast Atlantic (SEA) Ocean, resulting aerosol effects which vary time and location. Much work has focused on of plumes, but previous studies have also described an elevated free tropospheric water vapor signal SEA. Water influences climate its own...
Abstract. Wildfire smoke is one of the most significant concerns human and environmental health, associated with its substantial impacts on air quality, weather, climate. However, biomass burning emissions remain among largest sources uncertainties in quality forecasts. In this study, we evaluate plume forecasts from 12 state-of-the-art forecasting systems during Williams Flats fire Washington State, US, August 2019, which was intensively observed Fire Influence Regional to Global...
Carbonaceous emissions from wildfires are a dynamic mixture of gases and particles that have important impacts on air quality climate. Emissions feed atmospheric models estimated using burned area fire radiative power (FRP) methods rely satellite products. These approaches show wide variability large uncertainties, their accuracy is challenging to evaluate due limited aircraft ground measurements. Here, we present novel method estimate plume-integrated total carbon speciated emission rates...
Biomass burning particulate matter (BBPM) affects regional air quality and global climate, with impacts expected to continue grow over the coming years. We show that studies of North American fires have a systematic altitude dependence in measured BBPM normalized excess mixing ratio (NEMR; ΔPM/ΔCO), airborne high-altitude showing factor 2 higher NEMR than ground-based measurements. report direct measurements volatility partially explain difference observed across platforms. find when heated...
Abstract. We evaluate a regional-scale simulation with the WRF-Chem model for VAMOS (Variability of American Monsoon Systems) Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx), which sampled Southeast Pacific's persistent stratocumulus deck. Evaluation VOCALS-REx ship-based and three aircraft observations focuses on analyzing how aerosol loading affects marine boundary layer (MBL) dynamics cloud microphysics. compare local time series campaign-averaged longitudinal...
The Gridpoint Statistical Interpolation (GSI) Three-Dimensional Variational (3DVAR) data assimilation system is extended to treat the MOSAIC aerosol model in WRF-Chem, and be capable of assimilating surface PM2.5 concentrations. coupled GSI-WRF-Chem applied reproduce levels over China during an extremely polluted winter month, January 2013. After concentrations, correlation coefficients between observations results averaged assimilated sites are improved from 0.67 0.94. At nonassimilated...