A5077387852- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Advanced Aircraft Design and Technologies
- Arctic and Antarctic ice dynamics
- Vehicle emissions and performance
- Fire effects on ecosystems
- Advanced Image Fusion Techniques
- Urban Heat Island Mitigation
- Cryospheric studies and observations
- Particle Dynamics in Fluid Flows
- Water Quality Monitoring and Analysis
- Marine and coastal ecosystems
- Remote-Sensing Image Classification
- Calibration and Measurement Techniques
- Plant responses to elevated CO2
- Light effects on plants
- Solar and Space Plasma Dynamics
- Optical Coatings and Gratings
- Aeolian processes and effects
- Impact of Light on Environment and Health
- Advanced Image and Video Retrieval Techniques
Springfield College
2020-2025
Colorado State University
2009-2024
Langley Research Center
2015-2024
Drury University
2022
United States Department of Agriculture
2018-2020
Bennington College
2018
Oak Ridge Associated Universities
2014-2018
Associated Universities, Inc.
2014-2018
University of New Hampshire
2009-2016
Universities Space Research Association
2016
Abstract. Organic aerosol (OA) is an important fraction of submicron aerosols. However, it challenging to predict and attribute the specific organic compounds sources that lead observed OA loadings, largely due contributions from secondary production. This especially true for megacities surrounded by numerous regional create background. Here, we utilize in situ gas observations collected on board NASA DC-8 during NASA–NIER KORUS-AQ (Korea–United States Air Quality) campaign investigate...
We statistically analyze the impact of jet fuel properties on aerosols emitted by NASA Douglas DC-8 (Tail No. N817NA) CFM56-2-C1 engines burning 15 different aviation fuels. Data were collected for this single engine type during four different, comprehensive ground tests conducted over past decade, which allow us to clearly link changes in aerosol emissions compositional changes. It is found that aromatic and sulfur content most affect volatile fraction, dominates variability (but not...
Abstract. Surface measurements of direct and diffuse voltages at UV wavelengths were made the T1 site during MILAGRO (Megacity Initiative: Local Global Research Observations) field campaign in March 2006, using a multifilter rotating shadowband radiometer (UV-MFRSR). We used MFRSR data, together with from co-located CIMEL Sun photometer operating as part AERONET network, to deduce aerosol single scattering albedo (ω) 368 332 nm for four cloud-free days study. Our retrievals suggest that...
Abstract Biological aerosols represent a diverse subset of particulate matter that is emitted directly to the atmosphere in form (but not limited to) bacteria, fungal spores, pollens, viruses, and plant debris. These particles can have local air quality implications, but potentially play larger climate role by acting as efficient ice nucleating (INPs) cloud condensation nuclei. We deployed Wideband Integrated Bioaerosol Sensor on NASA DC‐8 aircraft (1) quantify boundary layer (BL)...
Abstract. In order to utilize satellite-based aerosol measurements for the determination of air quality, relationship between optical properties (wavelength-dependent, column-integrated extinction measured by satellites) and mass loading (PM2.5 used quality monitoring) must be understood. This connection varies with many factors including those specific type – such as composition, size, hygroscopicity surrounding atmosphere, temperature, relative humidity (RH), altitude, all which can vary...
Abstract. KORUS-AQ was an international cooperative air quality field study in South Korea that measured local and remote sources of pollution affecting the Korean Peninsula during May–June 2016. Some largest aerosol mass concentrations were a Chinese haze transport event (24 May). Air forecasts using WRF-Chem model with optical depth (AOD) data assimilation captured AOD this episode but overpredicted surface particulate matter Korea, especially PM2.5, often by factor 2 or larger. Analysis...
Abstract East Asia is the strongest global source region for anthropogenic black carbon (BC), most important light‐absorbing aerosol contributing to direct radiative climate forcing. To provide extended observational constraints on regional BC distributions and impacts, in situ measurements of were obtained with a single particle soot photometer during May/June 2016 Korean‐United States Air Quality aircraft campaign (KORUS‐AQ) South Korea. Unique chemical tracer relationships associated...
By 2050, the U.S. plans to increase solar energy from 3% 45% of nation's electricity generation. Quantifying wildfire smoke's impact on photovoltaic (PV) generation is essential meet this goal, especially given previous studies documenting sizable PV output losses due smoke. We quantify smoke-driven changes in baseline resource availability [i.e., amount direct normal (DNI) and global horizontal (GHI) irradiance] at different spatial temporal scales using radiative transfer model...
Abstract. Actinic flux, as well aerosol chemical and optical properties, were measured aboard the NASA DC-8 aircraft during ARCTAS (Arctic Research of Composition Troposphere from Aircraft Satellites) mission in Spring Summer 2008. These measurements used a radiative transfer code to retrieve spectral (350–550 nm) single scattering albedo (SSA) for biomass burning plumes encountered on 17 April 29 June. Retrieved SSA values subsequently calculate absorption Angstrom exponent (AAE) over...
Abstract Bulk aerosol composition and size distributions measured aboard the DC‐8 aircraft during Deep Convective Clouds Chemistry Experiment mission in May/June 2012 were used to investigate transport of mineral dust through nine storms encountered over Colorado Oklahoma. Measurements made at low altitudes (<5 km mean sea level (MSL)) storm inflow region compared those cirrus anvils (altitude > 9 MSL). Storm outflow Ca 2+ mass concentrations total coarse (1 µm < diameter 5 µm)...
Abstract The National Aeronautics and Space Administration (NASA)’s Arctic Radiation-IceBridge Sea Ice Experiment (ARISE) acquired unique aircraft data on atmospheric radiation sea ice properties during the critical late summer to autumn minimum commencement of refreezing. C-130 flew 15 missions over Beaufort between 4 24 September 2014. ARISE deployed a shortwave longwave broadband radiometer (BBR) system from Naval Research Laboratory; Solar Spectral Flux Radiometer (SSFR) University...
Abstract. Urban air pollution absorbs and scatters solar ultraviolet (UV) radiation, thus has a potentially large effect on tropospheric photochemical rates. We present the first detailed comparison between actinic fluxes (AF) in wavelength range 330–420 nm measured highly polluted conditions simulated with Tropospheric Ultraviolet-Visible (TUV) model. Measurements were made during MILAGRO campaign near Mexico City March 2006, at ground-based station (the T1 supersite) from NSF/NCAR C-130...
Abstract. We introduce a new instrument for the measurement of in situ ambient aerosol extinction over 300–700 nm wavelength range, spectral (SpEx) instrument. This capability is envisioned to complement existing instrumentation, allowing simultaneous evolution optical, chemical, and physical characteristics environment. In this work, detailed description provided along with characterization tests performed laboratory. Measured spectra NO2 polystyrene latex spheres (PSLs) agreed well...
Abstract Wildfire smoke is frequently present over the U.S. during agricultural growing season and will likely increase with climate change. Studies of impacts have largely focused on air quality human health; however, understanding smoke's impact photosynthetically active radiation (PAR) essential for predicting how affects plant growth. We compare surface shortwave irradiance diffuse fraction (DF) smoke‐impacted smoke‐free days from 2006 to 2020 using data multifilter rotating shadowband...
Abstract The representation of Arctic surface radiative fluxes in atmospheric models and reanalyses is integral to understanding relevant physical processes, yet testing these confounded by a scarcity situ observations near‐surface state profiles, cloud vertical structure, phase, properties. Here, airborne measurements obtained from the Radiation IceBridge Sea&Ice Experiment (ARISE) during fall 2014 are compared with concurrent products Modern‐Era Retrospective analysis for Research...
Abstract. Organic aerosol (OA) is an important fraction of submicron aerosols. However, it challenging to predict and attribute the specific organic compounds sources that lead observed OA loadings, largely due contributions from secondary production. This especially true for megacities surrounded by numerous regional create background. Here, we utilize in-situ gas observations collected on-board NASA DC-8 during NASA/NIER KORUS-AQ (KORea United States-Air Quality) campaign investigate...
Abstract. In situ observations of spectrally resolved aerosol extinction coefficients (300–700 nm at ∼ 0.8 resolution) from the May–June 2016 Korea–United States Ocean Color (KORUS-OC) oceanographic field campaign are reported. Measurements were made with custom-built Spectral Aerosol Extinction (SpEx) instrument that previously has been characterized only using laboratory-generated aerosols known size and composition. Here, performance SpEx under realistic operating conditions in was...
Abstract. Using a new approach that constrains thermodynamic modeling of aerosol composition with measured gas-to-particle partitioning inorganic nitrate, we estimate the acidity levels for sampled in South Korean planetary boundary layer during NASA/NIER KORUS-AQ field campaign. The pH (mean ± 1σ = 2.43 0.68) and liquid water content determined were then used to determine chemical regime fraction particulate matter (PM) sensitivity ammonia nitrate availability. We found formation is always...
Abstract. KORUS-AQ was an international cooperative air quality field study in South Korea that measured local and remote sources of pollution affecting the Korean peninsula during May–June 2016. Some largest aerosol mass concentrations were a Chinese haze transport event (May 24th). Air forecasts using WRF-Chem model with optical depth (AOD) data assimilation captured AOD this episode but over-predicted surface particulate matter concentrations, especially PM2.5 often by factor 2 or larger....
U.S. Landsat Analysis Ready Data (ARD) recently included the Land Surface Temperature (LST) product, which contains widespread and irregularly-shaped missing pixels due to cloud contamination or incomplete satellite coverage. Many analyses rely on complete LST images therefore techniques that accurately fill data gaps are needed. Here, development of a partial-convolution based model with U-Net like architecture reconstruct in ARD is discussed. The original partial convolution layer modified...
Abstract. This two-part study explores hyperspectral (300–700 nm) aerosol optical measurements obtained from in situ sampling methods employed during the May–June 2016 Korea–United States Ocean Color (KORUS-OC) cruise conducted concert with broader air quality campaign (KORUS-AQ). Part 1 focused on measurement of extinction coefficients (σext) using recently developed Spectral Aerosol Extinction (SpEx) instrument and showed that second-order polynomials provided a better fit to measured...
Abstract. Surface measurements of direct and diffuse voltages at UV wavelengths were made the T1 site during MILAGRO (Megacity Initiative: Local Global Research Observations) field campaign in March 2006, using a multifilter rotating shadowband radiometer (UV-MFRSR). We used MFRSR data, together with from co-located CIMEL Sun photometer operating as part AERONET network, to deduce aerosol single scattering albedo (ω) 368 332 nm for four cloud-free days study. Our retrievals suggest that...
Abstract. To recover the actual responsivity for Ultraviolet Multi-Filter Rotating Shadowband Radiometer (UV-MFRSR), complex (e.g., unstable, noisy, and with gaps) time series of its in situ calibration factors (V0) need to be smoothed. Many smoothing techniques require accurate input uncertainty series. A new method is proposed estimate dynamic by examining overall variation subgroup means within a moving window. Using this calculated Gaussian process (GP) regression provides mean functions...