A5075876680- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Wind and Air Flow Studies
- Atmospheric chemistry and aerosols
- Climate variability and models
- Remote Sensing and LiDAR Applications
- Fluid Dynamics and Turbulent Flows
- Plant Water Relations and Carbon Dynamics
- Air Quality and Health Impacts
- Groundwater flow and contamination studies
- Water Quality and Resources Studies
- Water Governance and Infrastructure
- Oceanographic and Atmospheric Processes
- Wind Energy Research and Development
- Combustion and flame dynamics
- Aeolian processes and effects
- Fire effects on ecosystems
- Carbon Dioxide Capture Technologies
- Conflict of Laws and Jurisdiction
- Groundwater and Isotope Geochemistry
- Advanced Optical Sensing Technologies
- Legal principles and applications
- Fire Detection and Safety Systems
- Air Quality Monitoring and Forecasting
Baylor University
2024
NOAA Chemical Sciences Laboratory
2020-2024
National Oceanic and Atmospheric Administration
2007-2023
Colorado Sleep Institute
2023
National Academies of Sciences, Engineering, and Medicine
2020
Clean Energy (United States)
2020
Cooperative Institute for Research in Environmental Sciences
2017-2020
NOAA Earth System Research Laboratory
2008-2019
Cleveland State University
2018
NOAA Physical Sciences Laboratory
2018
Abstract The concept of boundary layer mixing height for meteorology and air quality applications using lidar data is reviewed, new algorithms estimation heights from various types lower-tropospheric coherent Doppler measurements are presented. Velocity variance profiles derived demonstrate direct application to estimation, while other relationships the thus may also be used in estimate. applied ship-based, high-resolution (HRDL) velocity backscattered-signal acquired on R/V Ronald H. Brown...
The objective of the Indianapolis Flux Experiment (INFLUX) is to develop, evaluate and improve methods for measuring greenhouse gas (GHG) emissions from cities. INFLUX's scientific objectives are quantify CO2 CH4 emission rates at 1 km resolution with a 10% or better accuracy precision, determine whole-city similar skill, achieve high (weekly finer) temporal both spatial resolutions. experiment employs atmospheric GHG measurements towers aircraft, transport observations models,...
Abstract Forecast errors with respect to wind, temperature, moisture, clouds, and precipitation largely correspond the limited capability of current Earth system models capture simulate land–atmosphere feedback. To facilitate its realistic simulation in next-generation models, an improved process understanding related complex interactions is essential. this end, accurate 3D observations key variables (L–A) high vertical temporal resolution from surface free troposphere are indispensable....
Abstract A Halo Photonics Stream Line XR Doppler lidar has been deployed for the Indianapolis Flux Experiment (INFLUX) to measure profiles of mean horizontal wind and mixing layer height quantification greenhouse gas emissions from urban area. To continuously autonomously, a novel composite fuzzy logic approach developed that combines information various scan types, including conical vertical-slice scans zenith stares, determine unified measurement its uncertainty. The uses strengths each...
We present a high-resolution atmospheric inversion system combining Lagrangian Particle Dispersion Model (LPDM) and the Weather Research Forecasting model (WRF), test impact of assimilating meteorological observation on transport accuracy. A Four Dimensional Data Assimilation (FDDA) technique continuously assimilates observations from various observing systems into modeling system, is coupled to high resolution CO2 emission product Hestia simulate mole fractions CO2. For Indianapolis Flux...
Abstract. Measurements of turbulence are essential to understand and quantify the transport dispersal heat, moisture, momentum, trace gases within planetary boundary layer (PBL). Through years, various techniques measure using Doppler lidar observations have been proposed. However, accuracy these measurements has rarely validated against trusted in situ instrumentation. Herein, data from eXperimental Planetary Instrumentation Assessment (XPIA) used verify profiles through comparison with...
Abstract. Accurate three-dimensional information of wind flow fields can be an important tool in not only visualizing complex but also understanding the underlying physical processes and improving modeling. However, a thorough analysis measurement uncertainties is required to properly interpret results. The XPIA (eXperimental Planetary boundary layer Instrumentation Assessment) field campaign conducted at Boulder Atmospheric Observatory (BAO) Erie, CO, from 2 March 31 May 2015 brought...
Abstract Quantitative data on turbulence variables aloft—above the region of atmosphere conveniently measured from towers—have been an important but difficult measurement need for advancing understanding and modeling stable boundary layer (SBL). Vertical profiles streamwise velocity variances obtained NOAA’s high-resolution Doppler lidar (HRDL), which have shown to be approximately equal kinetic energy (TKE) conditions, are a measure in SBL. In present study, mean horizontal wind component U...
Abstract Annually and seasonally averaged wind profiles from three Doppler lidars were obtained sites in the Columbia River basin of east-central Oregon Washington, a major region wind-energy production, for Second Wind Forecast Improvement Project (WFIP2) experiment. The profile data are used to quantify spatial variability flows this area complex terrain, assess HRRR–NCEP model’s ability capture temporal profiles, evaluate model errors. measured speed differences over 70-km extent lidar...
Abstract. The eXperimental Planetary boundary layer Instrumentation Assessment (XPIA) field campaign took place in March through May 2015 at the Boulder Atmospheric Observatory, utilizing its 300 m meteorological tower, instrumented with two sonic anemometers mounted on opposite sides of tower six heights. This allowed for least one anemometer each level to be upstream all times and identification when a is wake frame. Other instrumentation, including profiling scanning lidars aided wake....
Abstract This work details a master oscillator power amplifier (MOPA) microjoule-class pulsed coherent Doppler lidar system configuration designed to measure line-of-sight wind velocities and backscatter intensity of atmospheric aerosols. The instrument is unique in its form factor. It consists two physically separated modules connected by 10 m umbilical cable. One module hosts the transceiver, which composed telescope, transmit/receive (T/R) switch, high-gain optical amplifier, housed small...
Abstract Sunlight warms sea surface temperature (SST) under calm winds, increasing atmospheric buoyancy flux, turbulence, and mixed layer (ML) depth in the afternoon. The diurnal range of SST exceeded 1°C for 24% days central tropical Indian Ocean during Dynamics Madden Julian Oscillation experiment October‐December 2011. Doppler lidar shows enhancement strength height convective turbulence ML over warm turbulent kinetic energy (TKE) dissipation rate marine scales with flux like previous...
Abstract We demonstrate the combination of three Doppler lidars (DLs), a water vapor differential absorption lidar and temperature rotational Raman for investigation interactions between land‐surface atmospheric boundary layer. This scanning was operated first time during Land‐Atmosphere Feedback Experiment at Atmospheric Radiation Measurement program's Southern Great Plain site, Oklahoma, USA, in August 2017, provided simultaneous surface layer profiles horizontal wind, humidity...
Abstract Ground‐level ozone (O 3 ) was unusually high in northern Colorado the summer of 2021 with maximum daily 8‐hr average (MDA8) concentrations 6 to 8 parts‐per‐billion by volume (ppbv) higher than 2019, 2020, or 2022. One more monitors on Front Range exceeded 2015 U.S. National Ambient Air Quality Standard (NAAQS) 70 ppbv 66 122 days from 1 June 30 September, and this record number exceedances coincided near presence dispersed smoke haze wildfires Arizona, California, Pacific Northwest....
Abstract On 21 August 2017, a solar eclipse occurred over the continental United States resulting in rapid reduction and subsequent increase of radiation large region country. The eclipse's effect on land‐atmosphere system is documented unprecedented detail using unique array sensors deployed at three sites north‐central Oklahoma. observations showed that turbulent fluxes heat momentum surface responded quickly to change radiation. decrease sensible flux resulted air temperature below 200 m,...
Abstract. During the eXperimental Planetary boundary layer Instrumentation Assessment (XPIA) campaign, which was carried out at Boulder Atmospheric Observatory (BAO) in spring 2015, multiple-Doppler scanning strategies were with wind lidars and Ka-band radars. Specifically, step–stare measurements collected simultaneously three Doppler lidars, while two radars simultaneous range height indicator (RHI) scans. The XPIA experiment provided unique opportunity to compare directly virtual-tower...
Abstract Understanding the complex dynamical interactions that occur during evolution of a wildland fire still remains challenge within research community. Processes such as entrainment, incident wind field, interaction between neighboring updrafts, among other processes, motivates need for more intensive measurement campaigns to determine mechanisms responsible processes observed updrafts evolve. A recent opportunity examine associated with fires was made possible Doppler lidar (DL) mounted...
Two gravel pit lakes in central Texas were examined over the course of two years with upgradient and downgradient piezometer installations. Groundwater lake water sampled bimonthly for nutrients, levels, groundwater chemistry, addition, rain gauges mini-piezometers installed, depth surveys conducted, a simple 2-D flow model was constructed. The project goal evaluating examining dynamics chemical effects as flows to surface back intent understand that systems have on connected shallow...
The Ozone Profiling Atmospheric Lidar is a scanning four-wavelength ultraviolet differential absorption lidar that measures tropospheric ozone and aerosols. Derived profiles from the data include concentration, aerosol extinction, calibrated backscatter. Aerosol calibrations assume clear air region aloft. Other products cloud base heights, layer scans of particulate plumes aircraft. range 280 m to 12 km with 5 resolution, while ranges about 1.2 100 resolution. In horizontally homogeneous...
Abstract. A simultaneous deployment of Doppler, temperature, and water-vapor lidars is able to provide profiles molecular destruction rates turbulent kinetic energy (TKE) dissipation in the convective boundary layer (CBL). Horizontal wind vertical wind, moisture fluctuations are combined for deriving by determining transversal temporal autocovariance functions (ACFs). These ACFs fitted their theoretical shapes coefficients inertial subrange. Error bars estimated a propagation noise errors....
Abstract Doppler-lidar wind-profile measurements at three sites were used to evaluate NWP model errors from two versions of NOAA’s 3-km-grid HRRR model, see whether updates in the latest version 4 reduced when compared against original 1. Nested (750-m grid) each also tested how grid spacing affected forecast skill. The part field phase Second Wind Forecasting Improvement Project (WFIP2), an 18-month deployment into central Oregon–Washington, a major wind-energy-producing region. This study...
Previous studies of the low-level jet (LLJ) over central Great Plains United States have been unable to determine role that mesoscale and smaller circulations play in transport moisture. To address this issue, two aircraft missions during International H 2 O Project (IHOP_2002) were designed observe closely a well-developed LLJ (primarily Oklahoma Kansas) with multiple observation platforms. In addition standard operational platforms (most important, radiosondes profilers) provide...