A5046393237- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Precipitation Measurement and Analysis
- Atmospheric chemistry and aerosols
- Aeolian processes and effects
- Climate variability and models
- Tropical and Extratropical Cyclones Research
- Cryospheric studies and observations
- Ionosphere and magnetosphere dynamics
- Ocean Waves and Remote Sensing
- Icing and De-icing Technologies
- Doctoral Education Challenges and Solutions
- Research Data Management Practices
- Health and Medical Research Impacts
- Health Sciences Research and Education
- scientometrics and bibliometrics research
- Academic Publishing and Open Access
- Academic integrity and plagiarism
- Artificial Intelligence in Healthcare and Education
- Radioactive contamination and transfer
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Species Distribution and Climate Change
- Fire effects on ecosystems
- Wind and Air Flow Studies
University of Illinois Urbana-Champaign
2016-2025
University of Illinois System
2007-2018
Urbana University
2018
American Meteorological Society
2014
Pennsylvania State University
2000
University of Michigan–Ann Arbor
2000
NSF National Center for Atmospheric Research
2000
Western Michigan University
2000
Illinois Archaeological Survey
2000
NOAA National Weather Service
1993-2000
Shallow, maritime cumuli are ubiquitous over much of the tropical oceans, and characterizing their properties is important to understanding weather climate. The Rain in Cumulus Ocean (RICO) field campaign, which took place during November 2004–January 2005 trades western Atlantic, emphasized measurements processes related formation rain shallow cumuli, how subsequently modifies structure ensemble statistics trade wind clouds. Eight weeks nearly continuous S-band polarimetric radar sampling,...
The Colorado State University cloud model is applied to the simulation of orogrophic snowfall. A ice crystal aggregation processes and primary nucleation secondary particle production crystals described. Sensitivity experiments demonstrated that plays an important role in controlling fields liquid water content, concentrations, surface precipitation amounts. sensitivity also support observations air mass often quite clean upper levels stable orographic clouds. Introducing a reduction...
Abstract Weather and climate models are challenged by uncertainties biases in simulating Southern Ocean (SO) radiative fluxes that trace to a poor understanding of cloud, aerosol, precipitation, processes, their interactions. Projects between 2016 2018 used situ probes, radar, lidar, other instruments make comprehensive measurements thermodynamics, surface radiation, cloud condensation nuclei (CCN), ice nucleating particles over the SO cold waters, ubiquitous liquid mixed-phase clouds common...
Abstract The central Great Plains region in North America has a nocturnal maximum warm-season precipitation. Much of this precipitation comes from organized mesoscale convective systems (MCSs). This is counterintuitive the sense that activity over out phase with local generation CAPE by solar heating surface. lower troposphere environment typically characterized low-level jet (LLJ) just above stable boundary layer (SBL), and available potential energy (CAPE) values peak SBL, resulting...
Abstract The NASA Cloud, Aerosol, and Monsoon Processes Philippines Experiment (CAMP 2 Ex) employed the P-3, Stratton Park Engineering Company (SPEC) Learjet 35, a host of satellites surface sensors to characterize coupling aerosol processes, cloud physics, atmospheric radiation within Maritime Continent’s complex southwest monsoonal environment. Conducted in late summer 2019 from Luzon, Philippines, conjunction with Office Naval Research Propagation Intraseasonal Tropical Oscillations...
The Bow Echo and Mesoscale Convective Vortex Experiment (BAMEX) is a research investigation using highly mobile platforms to examine the life cycles of mesoscale convective systems. It represents combination two related investigations study (a) bow echoes, principally those that produce damaging surface winds last at least 4 h, (b) larger systems long-lived vortices (MCVs). field phase BAMEX utilized three instrumented aircraft an array ground-based instruments. Two long-range turboprop were...
Aircraft measurements in many cold cloud systems have found a narrow layer of supercooled water to exist at the top, even temperatures colder than −30°C. We show this paper that imbalance between condensate supply rate and bulk ice crystal mass growth wide range updraft speeds is sufficient produce liquid near top because unique property crystals located there are small. Calculations also presented determine minimum magnitude maximum depth sustained required from an initially saturated...
Throughout the western United States and other semiarid mountainous regions across globe, water supplies are fed primarily through melting of snowpack. Growing populations place higher demands on water, while warmer winters earlier springs reduce its supply. Water managers tantalized by prospect cloud seeding as a way to increase winter snowfall, thereby shifting balance between supply demand. Little direct scientific evidence exists that confirms even basic physical hypothesis upon which...
Abstract The Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms (IMPACTS) is a NASA-sponsored field campaign to study wintertime snowstorms focusing on East Coast cyclones. This large cooperative effort takes place during the winters 2020–23 precipitation variability in winter cyclones improve remote sensing numerical forecasts snowfall. Snowfall within these storms frequently organized banded structures multiple scales. causes occurrence evolution wide...
Abstract Precipitation characteristics of trade wind clouds over the Atlantic Ocean near Barbuda are derived from radar and aircraft data compared with satellite-observed cloud fields collected during Rain in Cumulus (RICO) field campaign. S-band reflectivity measurements Z were converted to rainfall rates R using a Z–R relationship measurements. Daily varied 0 22 mm day−1. The area-averaged rate for 62-day period was 2.37 If corrected evaporation below base, this value is reduced 2.23...
Abstract The Seeded and Natural Orographic Wintertime Clouds: Idaho Experiment (SNOWIE) project aims to study the impacts of cloud seeding on winter orographic clouds. field campaign took place in between 7 January 17 March 2017 employed a comprehensive suite instrumentation, including ground-based radars airborne sensors, collect situ remotely sensed data around clouds containing supercooled liquid water before after with silver iodide aerosol particles. material was released primarily by...
Abstract This paper reviews research conducted over the last six decades to understand and quantify efficacy of wintertime orographic cloud seeding increase winter snowpack water supplies within a mountain basin. The fundamental hypothesis underlying as method enhance precipitation from systems is that cloud’s natural efficiency can be enhanced by converting supercooled ice upstream range in such manner newly created particles grow fall ground additional snow on specified target area. review...
Significance Cloud seeding to increase winter snowpack in mountains has traditionally been evaluated using precipitation gauges and target/control statistics leading mostly inconclusive results. Here, an approach employing radar is used quantify snowfall by first isolating returns that are unambiguously the result of cloud regions with light or no natural then quantifying seeding-induced at ground. The spatiotemporal evolution from quantified. Although this study focuses only on three cases,...
Abstract Supercooled liquid water (SLW) and mixed phase clouds containing SLW ice over the Southern Ocean (SO) are poorly represented in global climate numerical weather prediction models. Observed exists at lower temperatures than threshold values used to characterize its detrainment from convection model parameterizations, processes controlling formation removal understood. High‐resolution observations needed better SO. This study characterizes frequency spatial distribution of different...
Abstract. The cloud drop effective radius (Re) of the size distribution derived from passive satellite sensors is a key variable used in climate research. Validation these products has often taken place under stratiform conditions that favor assumption horizontal homogeneity by retrieval techniques. However, many studies have noted concerns with respect to significant biases retrieved Re arising heterogeneity, for example, cumulus fields. Here, we examine data collected during 2019 “Cloud,...
The importance of warm rain and melting processes in freezing precipitation events is investigated by analyzing 972 rawinsonde soundings taken during precipitation. cover regions the United States east Rocky Mountain states for period 1970–94. process was found to be unambiguously responsible 47% soundings. In these soundings, clouds had temperatures entirely below freezing, or top that were above freezing. Another 28% cloud between 0° −10°C. Clouds with >−10°C also can support an active...
Extreme cold air outbreaks (CAOs) affect a large region of the midlatitudes during winter months. An objective criterion was developed for identifying and ranking 30 most extreme CAOs over eastern United States using observational surface temperatures November–March 1948–2002. A composite these events shows that tropospheric polar vortex is weaker than average prior to CAO onset, while strengthens following onset. There also very little correlation between strength intensity CAOs. These...
Abstract During the Bow Echo and Mesoscale Convective Vortex Experiment, NOAA P-3 research aircraft executed 17 spiral descents to rear of convective lines document vertical variability hydrometeors above, within, below stratiform melting layer. Ten spirals were behind that exhibited bowing at some stage in their evolution. Although quick on forced sampling different particle zones, clear trends with respect temperature seen. For 16 spirals, ambient relative humidity ice was range 100% ± 4%...
Abstract The vertical motion and physical structure of elevated convection generating cells within the comma heads three continental winter cyclones are investigated using Wyoming W-band cloud radar mounted on National Science Foundation/National Center for Atmospheric Research (NSF/NCAR) C-130, supplemented by analyses from Rapid Update Cycle model Weather Surveillance Radar-1988 Doppler (WSR-88D) data. followed distinct archetypical tracks were typical those producing weather in midwestern...
Abstract This paper presents analyses of the microphysical structure cloud-top convective generating cells at temperatures between −10° and −55°C across comma head 11 continental cyclones, using data collected by W-band Wyoming Cloud Radar in situ instrumentation aboard National Science Foundation (NSF)/NCAR C-130. A case study one cyclone is presented, followed statistical entire dataset. Ice particle number concentrations averaged 1.9 times larger inside compared to outside, derived ice...
Abstract The bulk microphysical properties and number distribution functions ( N(D) ) of supercooled liquid water (SLW) ice inside between ubiquitous generating cells (GCs) observed over the Southern Ocean (SO) during Clouds Radiation Aerosol Transport Experimental Study (SOCRATES) measured by in situ cloud probes onboard NCAR/NSF G‐V aircraft are compared. SLW was detected all GCs with an average content 0.31 ± 0.19 g m −3 , 11% larger than values GCs. droplets (maximum dimension D < 50...
Abstract. Cumulus clouds are common over maritime regions. They important regulators of the global radiative energy budget and hydrologic cycle, as well a key contributor to uncertainty in anthropogenic climate change projections due aerosol–cloud interactions. These interactions regionally specific owing their strong influences on aerosol sources meteorology. Here, our analysis focuses statistical properties marine boundary layer (MBL) chemistry relationships MBL cumulus cloud just above...
Abstract The Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms field campaign comprised three deployments in January February 2020, 2022, 2023. Throughout these deployments, the NASA Earth Resources-2 (ER-2) aircraft conducted 26 research flights, equipped with vertically pointing radars. These radars sampled vertical structure extratropical cyclone clouds at four distinct radar wavelengths, enabling a finer scale analysis reflectivity radial velocity...