A5009621901- Atmospheric aerosols and clouds
- Climate variability and models
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Tropical and Extratropical Cyclones Research
- Aeolian processes and effects
- Atmospheric and Environmental Gas Dynamics
- Light effects on plants
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Advanced Optical Sensing Technologies
- Plant Surface Properties and Treatments
- Infrared Target Detection Methodologies
- Solar Radiation and Photovoltaics
- Advanced Semiconductor Detectors and Materials
- Integrated Circuits and Semiconductor Failure Analysis
- Arctic and Antarctic ice dynamics
- Conservation Techniques and Studies
- Environmental Impact and Sustainability
- Big Data and Business Intelligence
- Plant Pathogens and Resistance
- Remote Sensing and Land Use
- Climate Change Policy and Economics
- Marine Bivalve and Aquaculture Studies
- Precipitation Measurement and Analysis
Lawrence Livermore National Laboratory
2015-2025
University of Maryland, Baltimore County
2023
Langley Research Center
2023
Analytical Mechanics Associates (United States)
2023
NOAA Chemical Sciences Laboratory
2023
Cooperative Institute for Research in Environmental Sciences
2023
University of Colorado Boulder
2023
University of California, Davis
2023
Irvine University
2018-2021
University of California, Irvine
2018-2021
Abstract This study examines the deep convection populations and mesoscale convective systems (MCSs) simulated in DYAMOND (DYnamics of atmospheric general circulation modeled on non‐hydrostatic domains) winter project. A storm tracking algorithm is applied to six simulations a global high‐resolution satellite cloud precipitation data set for comparison. The frequencies tropical organized vary widely among models regions, although robust MCSs are generally underestimated. diurnal cycles MCS...
Abstract This paper describes the first implementation of Δ x = 3.25 km version Energy Exascale Earth System Model (E3SM) global atmosphere model and its behavior in a 40‐day prescribed‐sea‐surface‐temperature simulation (January 20 through February 28, 2020). was performed as part DYnamics Atmospheric general circulation Modeled On Non‐hydrostatic Domains (DYAMOND) Phase 2 intercomparison. Effective resolution is found to be horizontal dynamics grid despite using coarser for physical...
Abstract. Cloud microphysical process rates control the amount of condensed water in clouds and impact susceptibility precipitation to cloud-drop number aerosols. The relative importance different processes a climate model is analyzed, autoconversion accretion are found be critical condensate budget most regions. A simple steady-state warm rain formation used illustrate that diagnostic formulations typical models may result excessive contributions from autoconversion, compared observations...
Abstract. The relationship between precipitation rate and accumulation mode aerosol concentration in marine stratocumulus-topped boundary layers is investigated by applying the susceptibility metric to aircraft data obtained during VOCALS Regional Experiment. A new method calculate that incorporates non-precipitating clouds introduced. mean R over a segment of expressed as product drizzle fraction f intensity I (mean for drizzling columns). Sx then defined fractional decrease variable x =...
Abstract The increase in cloud optical depth with warming at middle and high latitudes is a robust feedback response found across all climate models. This study builds on results that suggest the to temperature timescale invariant for low‐level clouds. invariance allows one use satellite observations constrain models' feedbacks. Three passive‐sensor retrievals are compared against simulations from eight models Atmosphere Model Intercomparison Project (AMIP) of 5th Coupled (CMIP5). confirms...
Abstract. This study documents clouds simulated by the Energy Exascale Earth System Model (E3SM) version 2 (E3SMv2) and attempts to understand what causes model behavior change in relative E3SMv1. is done analyzing last 30-year (1985–2014) data from 165-year historical simulations using E3SMv1 v2 four sensitivity tests isolate impact of changes parameter choices its turbulence, shallow convection, cloud macrophysics parameterization (Cloud Layers Unified By Binormals, CLUBB); microphysical...
Abstract. Although typically associated with precipitating cumuli, cold pools also form under shallower stratocumulus. This study presents cold-pool observations as sampled by the NSF/NCAR C-130, which made cloud and boundary-layer measurements over southeast Pacific stratocumulus region at an altitude of approximately 150 m during VOCALS Regional Experiment. Ninety edges are found in C-130 identifying step-like changes potential temperature. Examination their mesoscale environment shows...
Abstract. Five pockets of open cells (POCs) are studied using aircraft flights from the VOCALS Regional Experiment (VOCALS-REx), conducted in October and November 2008 over southeast Pacific Ocean. Satellite imagery geostationary satellite GOES-10 is used to distinguish POC areas, measurements compare aerosol, cloud, precipitation, boundary layer conditions inside outside POCs. Conditions observed across individual cases also compared. POCs layers with a wide range inversion heights (1250...
Abstract. Warm boundary layer clouds in the eastern North Atlantic region exhibit significant diurnal variations cloud properties. However, cycle of aerosol indirect effect (AIE) for these remains poorly understood. This study takes advantage recent advancements spatial resolution geostationary satellites to explore daytime variation AIE by estimating susceptibilities changes droplet number concentration (Nd). Cloud retrievals month July over 4 years (2018–2021) from Spinning Enhanced...
Abstract The new generation of heterogeneous CPU/GPU computer systems offer much greater computational performance but are not yet widely used for climate modeling. One reason this is that traditional models were written before GPUs available and would require an extensive overhaul to run on these machines. In addition, even conventional “high–resolution” simulations don't currently provide enough parallel work keep busy, so the benefits such be limited types scientists accustomed to. vision...
Abstract Subkilometer processes are critical to the physics of aerosol‐cloud interaction (ACI) but have been dependent on parameterizations in global model simulations. We thus report strength ACI Ultra‐Parameterized Community Atmosphere Model (UPCAM), a multiscale climate that uses coarse exterior resolution embed explicit cloud‐resolving models with enough (250 m horizontal, 20 vertical) quasi‐resolve subkilometer eddies. To investigate impact ACIs, UPCAM's simulations compared coarser 4...
Abstract To improve the representation of microphysical processes in convective clouds and their interaction with aerosol stratiform clouds, a two‐moment microphysics parameterization (CMP) scheme developed by Song Zhang (2011, https://doi.org/10.1029/2010jd014833 ) is upgraded implemented E3SM. The new developments include: (a) implementing for graupel to enhance ice‐phase processes; (b) representing impact spatial inhomogeneity cloud droplets cumulus ensembles on autoconversion accretion...
Abstract. Aerosol effective radiative forcing critically influences climate projections but remains poorly constrained. Using the Energy Exascale Earth System Model (E3SM) Simple Cloud-Resolving E3SM Atmosphere (SCREAM) v1 configuration, we quantify due to anthropogenic aerosol changes using a simplified prescribed scheme (SPA) derived from v3. Nudged simulations at 3 km and 12 horizontal grid spacings reveal more negative than reference 100-km v3 whence SPA properties are derived. The...
Abstract Quantifying the sensitivity of warm rain to aerosols is important for constraining climate model estimates aerosol indirect effects. In this study, precipitation cloud droplet number concentration ( N d ) in satellite retrievals quantified by applying susceptibility metric a combined CloudSat/Moderate Resolution Imaging Spectroradiometer data set stratus and stratocumulus clouds that cover tropical subtropical Pacific Ocean Gulf Mexico. Consistent with previous observational studies...
Abstract Ground‐based observations from three middle‐ and high‐latitude sites managed by the U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) program are used to determine sensitivity low‐cloud optical depth temperature test whether support mechanisms previously proposed affect feedback. Analysis cloud retrievals previous satellite findings that decreases or stays constant with increases in when is warm but cold. The liquid water path warming largely explains at all sites....
Abstract This study examines marine boundary layer cloud regime transition during a cold air outbreak (CAO) over the Norwegian Sea, simulated by global storm‐resolving model (GSRM) known as Simple Cloud‐Resolving Energy Exascale Earth System Model Atmosphere (SCREAM). By selecting observational references based on combination of large‐scale conditions rather than strict time‐matched comparisons, this finds that SCREAM qualitatively captures CAO transition, including growth, mesoscale...
Abstract This study assesses a 40‐day 3.25‐km global simulation of the Simple Cloud‐Resolving E3SM Model (SCREAMv0) using high‐resolution ground‐based observations from Atmospheric Radiation Measurement (ARM) Green Ocean Amazon (GoAmazon) field campaign. SCREAMv0 reasonably captures diurnal timing boundary layer clouds yet underestimates cloud fraction and mid‐level congestus. well replicates precipitation cycle, however it exhibits biases in cluster size distribution compared to scanning...
Abstract We study the cloud response to a +4K surface warming in new multiscale climate model that uses enough interior resolution begin explicitly resolving boundary layer turbulence (i.e., ultraparameterization or UP). UP's predictions are compared against those from standard superparameterization (SP). The mean radiative effect feedback turns out be remarkably neutral across all of our simulations, despite some radical changes both microphysical parameter settings and cloud‐resolving grid...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Advances Modeling Systems (JAMES). Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v1]Go to new versionConvection-Permitting Simulations with the E3SM Global Atmosphere ModelAuthorsPeter MartinCaldwelliDChristopher RyutaroTeraiiDBenjamin RHillmanNoel...
<title>Abstract</title> We propose a protocol to evaluate and analyze year-long simulations of global storm-resolving models (GSRMs). The proposed complements an earlier 40-day simulation under the DYAMOND (DYnamics Atmospheric general circulation Modeled On Non-hydrostatic Domains) project allow analysis seasonal cycle associated climatic relevant phenomena. This intercomparison aims reveal how GSRMs, which can simulate meso-scale convective systems (MCSs) in domain, reproduce atmospheric...