A5013327054- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Wind and Air Flow Studies
- Icing and De-icing Technologies
- Cryospheric studies and observations
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Precipitation Measurement and Analysis
- Arctic and Antarctic ice dynamics
- Air Quality Monitoring and Forecasting
- Marine and coastal ecosystems
- Air Traffic Management and Optimization
- Target Tracking and Data Fusion in Sensor Networks
- Winter Sports Injuries and Performance
- Atmospheric Ozone and Climate
- Fluid Dynamics and Turbulent Flows
- Aquatic Ecosystems and Biodiversity
- Fatigue and fracture mechanics
- Simulation Techniques and Applications
- Remote Sensing and Land Use
- Oil Spill Detection and Mitigation
- Remote Sensing in Agriculture
- Advanced Algorithms and Applications
- Cloud Computing and Resource Management
NSF National Center for Atmospheric Research
2017-2024
NOAA Global Systems Laboratory
2024
NOAA Earth System Research Laboratory
2024
Research Applications (United States)
2021
Pennsylvania State University
2012-2020
Abstract A novel bulk microphysics scheme that predicts the evolution of ice properties, including aspect ratio (shape), mass, number, size, and density is described, tested, demonstrated. The named Ice-Spheroids Habit Model with Aspect-Ratio Evolution (ISHMAEL). Ice modeled as spheroids nucleated one two species depending on nucleation temperature. Microphysical process rates determine how shape other properties evolve. third aggregate also employed, diversifying in model. Tests during...
ABSTRACT Because unmanned aircraft systems (UAS) offer new perspectives on the atmosphere, their use in atmospheric science is expanding rapidly. In support of this growth, International Society for Atmospheric Research Using Remotely-Piloted Aircraft (ISARRA) has been developed and convened annual meetings “flight weeks.” The 2018 flight week, dubbed Lower Profiling Studies at Elevation–A Team Experiment (LAPSE-RATE), involved a 1-week deployment to Colorado’s San Luis Valley. Between 14 20...
This paper describes and tests a single-particle ice growth model that evolves both crystal mass shape as result of vapor riming. Columnar collision efficiencies in the are calculated using new theoretical method derived from spherical efficiencies. The is able to evolve mass, shape, fall speed growing across range temperatures, it compares well with wind tunnel data. onset time riming effects on between −3° −16°C modeled, compared data for liquid water content 0.4 g m −3 . Under these...
Concentrations of airborne chemical and biological agents from a hazardous release are not spread uniformly. Instead, there regions higher concentration, in part due to local atmospheric flow conditions which can attract agents. We equipped ground station two rotary-wing unmanned aircraft systems (UASs) with ultrasonic anemometers. Flights reported here were conducted 10 15 m above level (AGL) at the Leach Airfield San Luis Valley, Colorado as Lower Atmospheric Process Studies Elevation—a...
Abstract The boundary layer plays a critical role in regulating energy and moisture exchange between the surface free atmosphere. However, lower atmosphere (including shallow flow features horizontal gradients that influence local weather) are not sampled at time space scales needed to improve mesoscale analyses used drive short-term model predictions of impactful weather. These data gaps exasperated remote less developed parts world where relatively cheap observational capabilities could...
There are two global aerosol forecast systems currently under development at NOAA, both of which coupled online with the Unified Forecast System (UFS), encompassing ocean, sea ice, wave and land surface components for Subseasonal to Seasonal (S2S) forecasting: UFS-Aerosols UFS-Chem.  The model is planned be implemented into Global Ensemble (GEFS) v13.0 in 2026, incorporates NASA’s 2nd-generation GOCART within a National Operational Prediction Capability (NUOPC)...
Ozone profiles from balloon‐borne ozonesondes are used for development of satellite algorithms and in chemistry‐climate model initialization, assimilation evaluation. An important issue the application these is how best to treat variations where varying photochemical dynamical influences can cause ozone mixing ratio tropospheric segments profile change by a factor 2–3 within day. Clustering techniques an ideal way approach statistical classification data we apply self‐organizing maps...
Abstract The self-organizing map (SOM) statistical technique is applied to vertical profiles of thermodynamic and kinematic parameters from a Rapid Update Cycle-2 (RUC-2) proximity sounding dataset with the goal better distinguishing predicting supercell tornadic environments. An SOM topologically ordered mapping input data onto two-dimensional array nodes that can be used classify large datasets into meaningful clusters. relative ability SOMs derived each parameter separate soundings in way...
Abstract Uncrewed aircraft system (UAS) observations collected during the 2018 Lower Atmospheric Process Studies at Elevation—a Remotely Piloted Aircraft Team Experiment (LAPSE-RATE) field campaign were assimilated into a high-resolution configuration of Weather Research and Forecasting Model using an ensemble Kalman filter. The benefit UAS was assessed for terrain-driven (drainage upvalley) flow event that occurred within Colorado’s San Luis Valley (SLV) independent observations. analysis...
Abstract A quasi-idealized 3D squall-line case is simulated using a novel bulk microphysics scheme called the Ice-Spheroids Habit Model with Aspect-ratio Evolution (ISHMAEL). In ISHMAEL, evolution of ice particle properties (e.g., mass, shape, maximum diameter, density, and fall speed) are predicted during vapor growth, sublimation, riming, melting, allowing to evolve from various microphysical processes without needing separate unrimed rimed categories. ISHMAEL produces both transition zone...
Abstract. Unmanned aircraft systems (UASs) offer innovative capabilities for providing new perspectives on the atmosphere, and therefore atmospheric scientists are rapidly expanding their use, particularly studying planetary boundary layer. In support of this expansion, from 14 to 20 July 2018 International Society Atmospheric Research using Remotely piloted Aircraft (ISARRA) hosted a community flight week, dubbed Lower Profiling Studies at Elevation – Remotely-piloted Team Experiment...
Abstract Methods to improve the representation of hail in Thompson–Eidhammer microphysics scheme are explored. A new two-moment and predicted density graupel category is implemented into scheme. Additionally, one-moment category’s intercept parameter modified, based on observations, shift properties become more hail-like since designed represent both hail. Finally, methods diagnose maximum expected size at surface aloft implemented. The original version, newly modified (to be hail-like)...
Abstract The potential for polarimetric Doppler radar measurements to improve predictions of ice microphysical processes within an idealized model–observational framework is examined. In effort more rigorously constrain growth (e.g., vapor deposition) with observations natural clouds, a novel developed compare simulated and observed measurements, coupling bulk adaptive-habit model forward model. Bayesian inference on key parameters then used, via Markov chain Monte Carlo sampler, estimate...
Abstract This paper discusses the advection of coupled hydrometeor quantities by air motion in atmospheric models. It is shown that any bulk property derived from a set advected microphysical variables must meet certain conditions order to be preserved during transport using linear or semilinear schemes when initially uniform, with implications for physical consistency property. A new, efficient flux-based method calculating advection, similar vector applied previously aerosol modeling, also...
Abstract. The simulation dataset described herein provides a high-resolution depiction of the four-dimensional variability weather conditions across northern half San Luis Valley, Colorado, during 14–20 July 2018 Lower Atmospheric Profiling Studies at Elevation-A Remotely-Piloted Aircraft Team Experiment (LAPSE-RATE) field program. simulations explicitly resolved phenomena (e.g., wind shift boundaries, vertical shear, strong thermals, turbulence in boundary layer, fog, low ceilings and...
Abstract An IMPROVE-2 orographic precipitation case is simulated using the Ice-Spheroids Habit Model with Aspect-Ratio Evolution (ISHMAEL) microphysics. In ISHMAEL, evolution of ice particle properties such as mass, shape, size, density, and fall speed are predicted. These along size distributions from ISHMAEL model-derived spatial distribution accumulated compared to observations. predicts planar columnar particles at locations that agree Sensitivity simulations used explore impact...
Abstract Herein we describe the moist dynamics formulation implemented within graphics processing unit‐resident large‐eddy simulation FastEddy ® model, which includes a simple saturation adjustment scheme for condensation and evaporation processes. Two LES model intercomparison exercises non‐precipitating shallow cumulus clouds are simulated in order to validate this extension, including static forcing time‐dependent case. Overall, find our dynamical, thermodynamical microphysical...
Abstract Uncrewed aircraft system (UAS) observations from the Lower Atmospheric Profiling Studies at Elevation–A Remotely-Piloted Aircraft Team Experiment (LAPSE-RATE) field campaign were assimilated into a high-resolution configuration of Weather Research and Forecasting (WRF) Model. The impact assimilating targeted UAS in addition to surface was compared that obtained when alone using observing experiments (OSEs) for terrain-driven flow case convection initiation (CI) observed within...
Abstract The prediction of supercooled large drops (SLD) from the Thompson–Eidhammer (TE) microphysics scheme—run as part High-Resolution Rapid Refresh (HRRR) model—is evaluated with observations In-Cloud Icing and Large drop Experiment (ICICLE) field campaign. These are also used to train a random forest machine learning (ML) model, which is then predict SLD several variables derived HRRR model output. Results provide insight on limitations benefits each model. Generally, ML results in an...
For the past two decades, NOAA’s Global Systems Laboratory (GSL) developed and refined a regional hourly-updated high resolution numerical prediction system known as High-Resolution Rapid Refresh (HRRR).  This is run operationally by NOAA has been widely used for aviation, severe weather, renewable energy, general short-range forecast applications.  Prediction of aviation-related hazards always main focus area this model much associated physics data assimilation...
Recognizing the uncertainties associated with fire emission, a crucial factor influencing aerosol prediction, we have initiated studies to improve emission for subseasonal seasonal (S2S) forecasts. Two global aerosol/chemistry forecast models are currently under development and been fully coupled Unified Forecast System (UFS), encompassing ocean, sea ice, wave land surface components S2S forecasts at NOAA. One is UFS-Aerosols: second-generation UFS system, which embeds NASA’s...
Abstract Explicit simulation of hailstorms remains a challenge partly due to the lack accurate representations both initial conditions and microphysical processes. Using moderate hailstorm case that occurred in Beijing on 10 June 2016, impact explicit hail prediction has been studied Part I this two-part work via high-resolution data assimilation. This II paper examines role improved graupel treatment by comparing recently upgraded Thompson–Eidhammer microphysics scheme (MP38) with two...
Abstract. The simulations were forced using data from the High-Resolution Rapid Refresh (HRRR) and Global Forecast System (GFS) obtained National Center for Environmental Prediction (NCEP) Central Operations (NCO). nested WRF configuration used in this study featured a large-eddy-permitting, 111-m grid spacing mesh inner-most domain. Output forecasts processed on-the-fly Unified Post Processor (UPP). A THREDDS server was coupled with web-viewer to provide real-time graphics that support UAS...
Abstract The OWLeS IOP2b lake-effect case is simulated using the Weather Research and Forecasting (WRF) Model with a horizontal grid spacing of 148 m (WRF-LES mode). dynamics microphysics high-resolution snowband coarser-resolution band from parent nest (1.33-km spacing) are compared to radar aircraft observations. Ice Spheroids Habit Aspect-ratio Evolution (ISHMAEL) used, which predicts evolution ice particle properties including shape, maximum diameter, density, fall speed. microphysical...