A5066991816- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Wind and Air Flow Studies
- Aeolian processes and effects
- Fluid Dynamics and Turbulent Flows
- Geophysics and Gravity Measurements
- Solar Radiation and Photovoltaics
- Solar and Space Plasma Dynamics
- Nuclear reactor physics and engineering
- Power System Reliability and Maintenance
- Remote Sensing and LiDAR Applications
- Tropical and Extratropical Cyclones Research
- Computational Fluid Dynamics and Aerodynamics
- Distributed and Parallel Computing Systems
- Simulation Techniques and Applications
- Plant Water Relations and Carbon Dynamics
- Reservoir Engineering and Simulation Methods
- Fault Detection and Control Systems
- Power Systems Fault Detection
- Energy Load and Power Forecasting
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
Brookhaven National Laboratory
2016-2025
University of the Ryukyus
2009-2024
University of Miami
2021
Pacific Northwest National Laboratory
2020
Bureau of Meteorology
2018
Nagoya University
2006-2009
Subtropical marine low cloud sensitivity to an idealized climate change is compared in six large‐eddy simulation (LES) models as part of CGILS. July cover simulated at three locations over the subtropical northeast Pacific Ocean, which are typified by cold sea surface temperatures (SSTs) under well‐mixed stratocumulus, cool SSTs decoupled and shallow cumulus clouds overlying warmer SSTs. The includes a uniform 2 K SST increase with corresponding moist‐adiabatic warming aloft subsidence...
CGILS—the CFMIP‐GASS Intercomparison of Large Eddy Models (LESs) and single column models (SCMs)—investigates the mechanisms cloud feedback in SCMs LESs under idealized climate change perturbation. This paper describes CGILS results from 15 8 LES models. Three regimes over subtropical oceans are studied: shallow cumulus, cumulus stratocumulus, well‐mixed coastal stratus/stratocumulus. In stratocumulus stratus regimes, without activated convection generally simulated negative feedbacks, while...
Abstract The U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) user facility recently initiated the Large-Eddy Simulation (LES) ARM Symbiotic and Observation (LASSO) activity focused on shallow convection at ARM’s Southern Great Plains (SGP) atmospheric observatory in Oklahoma. LASSO is designed to overcome an oft-shared difficulty bridging gap from point-based measurements scales relevant for model parameterization development, it provides approach add value observations...
Abstract This work empirically examines the dependence of entrainment‐mixing mechanisms on averaging scale in cumulus clouds using situ aircraft observations during Routine Atmospheric Radiation Measurement Aerial Facility Clouds with Low Optical Water Depths Radiative Observations (RACORO) field campaign. A new measure homogeneous mixing degree is defined that can encompass all types mechanisms. Analysis homogenous shows that, average, decreases increasing scales, suggesting apparent...
Large-eddy simulation (LES) is able to capture key boundary-layer (BL) turbulence and cloud processes. Yet, large-scale forcing surface turbulent fluxes of sensible latent heat are often poorly prescribed for LES simulations. We derive these quantities from measurements reanalysis obtained two cold air outbreak (CAO) events during Phase I the Aerosol Cloud meTeorology Interactions oVer western ATlantic Experiment (ACTIVATE) in February-March 2020. study contrasting CAO cases by performing...
Abstract This work examines the relationships of entrainment rate to vertical velocity, buoyancy, and turbulent dissipation by applying stepwise principal component regression observational data from shallow cumulus clouds collected during Routine Atmospheric Radiation Measurement (ARM) Aerial Facility (AAF) Clouds with Low Optical Water Depths (CLOWD) Radiative Observations (RACORO) field campaign over ARM Southern Great Plains (SGP) site near Lamont, Oklahoma. The RACORO simulated using a...
Abstract. Different entrainment–mixing processes can occur in clouds; however, a homogeneous mixing mechanism is often implicitly assumed most commonly used microphysics schemes. Here, we first present new parameterization that uses the grid mean relative humidity without requiring of entrained air. Then, implemented scheme large eddy simulation model, and sensitivity experiments are conducted to compare with default parameterization. The results indicate has larger impact on number...
Abstract Representation of shallow cumulus is a challenge for mesoscale numerical weather prediction models. These cloud fields have important effects on temperature, solar irradiance, convective initiation, and pollutant transport, among other processes. Recent improvements to physics schemes available in the Weather Research Forecasting (WRF) Model aim improve representation cumulus, particular over land. The DOE LES ARM Symbiotic Simulation Observation Workflow (LASSO) project provides...
Abstract A 60 h case study of continental boundary layer cumulus clouds is examined using two large‐eddy simulation (LES) models. The based on observations obtained during the RACORO Campaign (Routine Atmospheric Radiation Measurement (ARM) Aerial Facility (AAF) Clouds with Low Optical Water Depths (CLOWD) Radiative Observations) at ARM Climate Research Facility's Southern Great Plains site. LES models are driven by continuous large‐scale and surface forcings constrained multimodal...
Abstract Aerosol effects on micro/macrophysical properties of marine stratocumulus clouds over the western North Atlantic Ocean (WNAO) are investigated using in situ measurements and large-eddy simulations (LES) for two cold-air outbreak (CAO) cases (28 February 1 March 2020) during Cloud Meteorology Interactions Western Experiment (ACTIVATE). The LES is able to reproduce vertical profiles liquid water content (LWC), effective radius r eff cloud droplet number concentration N c from fast...
A new approach is presented to estimate entrainment rate in cumulus clouds. The directly derived from the definition of fractional and relates it mixing fraction height above cloud base. results compare favorably with those obtained a commonly used approach, have smaller uncertainty. This has several advantages: eliminates need for in‐cloud measurements temperature water vapor content, which are often problematic current aircraft observations; potential straightforwardly connecting...
Abstract Surface momentum, sensible heat, and latent heat fluxes are critical for atmospheric processes such as clouds precipitation, parameterized in a variety of models ranging from cloud-resolving to large-scale weather climate models. However, direct evaluation the parameterization schemes these surface is rare due limited observations. This study takes advantage long-term observations collected at Southern Great Plains site by Department Energy Atmospheric Radiation Measurement program...
Abstract Phase 1 of the CGILS large‐eddy simulation (LES) intercomparison is extended to understand if subtropical marine boundary‐layer clouds respond idealized climate perturbations consistently in six LES models. Here responses quadrupled carbon dioxide ( “ fast adjustment ” ) and a composite perturbation representative CMIP3 multimodel mean 2×CO 2 near‐equilibrium conditions are analyzed. As 1, run equilibrium using specified steady summertime forcings three locations Northeast Pacific...
Abstract We investigate a significant model‐observation difference found between cloud‐base vertical velocity for continental shallow cumulus simulated using large‐eddy simulations (LES) and observed by Doppler lidar measurements over the U.S. Southern Great Plains Atmospheric Radiation Measurement Facility. The LES is dominated updrafts that are consistent with general picture convective clouds but inconsistent observations also show presence of considerable downdrafts. underestimation...
Abstract Large spatial heterogeneities in shallow convection result uncertainties estimations of domain‐averaged cloud fraction profiles (CFP). This issue is addressed by using large eddy simulations over land coupled with a radar simulator. Results indicate that zenith profiling observations are inadequate to provide reliable CFP estimates. Use scanning (SCR), performing sequence cross‐wind horizon‐to‐horizon scans, not straightforward due the strong dependence sensitivity target distance....
Abstract Observation‐based modeling case studies of continental boundary layer clouds have been developed to study cloudy layers, aerosol influences upon them, and their representation in cloud‐ global‐scale models. Three 60 h periods span the temporal evolution cumulus, stratiform, drizzling cloud systems, representing mixed transitional states rather than idealized or canonical cases. Based on situ measurements from Routine AAF (Atmospheric Radiation Measurement (ARM) Aerial Facility)...
Abstract Climatically important low‐level clouds are commonly misrepresented in climate models. The FAst‐physics System TEstbed and Research (FASTER) Project has constructed case studies from the Atmospheric Radiation Measurement Climate Facility's Southern Great Plain site during RACORO aircraft campaign to facilitate research on model representation of boundary‐layer clouds. This paper focuses using single‐column Community Atmosphere Model version 5 (SCAM5) simulations a multi‐day...
Abstract We produce fine‐resolution, three‐dimensional fields of meteorological and other variables for the U.S. Department Energy's Atmospheric Radiation Measurement (ARM) Southern Great Plains site. The Community Gridpoint Statistical Interpolation system is implemented in a multiscale data assimilation (MS‐DA) framework that used within Weather Research Forecasting model at cloud‐resolving resolution 2 km. MS‐DA algorithm uses existing reanalysis products constrains fine‐scale atmospheric...
Abstract This study evaluates the performances of seven single-column models (SCMs) by comparing simulated cloud fraction with observations at Atmospheric Radiation Measurement Program (ARM) Southern Great Plains (SGP) site from January 1999 to December 2001. Compared 3-yr mean observational fraction, ECMWF SCM underestimates all levels and GISS below 200 hPa. The two GFDL SCMs underestimate lower-to-middle level but overestimate upper-level fraction. three Community Atmosphere Model (CAM)...
Abstract Observations of the surface layer and atmospheric boundary (ABL) were collected as part Lower Atmosphere Precipitation Study (LAPS), which investigated relationship between conditions ABL processes. The LAPS was Core Research for Evolutional Science Technology (CREST) program, under auspices Japan Agency (JST). began in August 2003 over a flat region mid‐latitude China at 32·55°N, 116·78°E. before, during, after Meiyu season provided data varying from relatively dry to moist....