A5060017787- Meteorological Phenomena and Simulations
- Precipitation Measurement and Analysis
- Climate variability and models
- Atmospheric aerosols and clouds
- Tropical and Extratropical Cyclones Research
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Ocean Waves and Remote Sensing
- Soil Moisture and Remote Sensing
- Atmospheric chemistry and aerosols
- Aeolian processes and effects
- Ionosphere and magnetosphere dynamics
- Lightning and Electromagnetic Phenomena
- Oceanographic and Atmospheric Processes
- Plant Water Relations and Carbon Dynamics
- Wind and Air Flow Studies
- Fire effects on ecosystems
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Hydrology and Watershed Management Studies
- Radio Wave Propagation Studies
- Geological and Tectonic Studies in Latin America
- Icing and De-icing Technologies
- Structural Response to Dynamic Loads
University of Illinois Urbana-Champaign
2015-2024
Pennsylvania State University
2021
University of Illinois Chicago
2017-2019
Naval Postgraduate School
2019
Urbana University
2018
University of Illinois System
2009-2018
Maine Molecular Quality Controls (United States)
2018
George Mason University
2010
Colorado State University
2004-2007
University of Utah
2000-2004
The instruments on the Tropical Rainfall Measuring Mission (TRMM) satellite have been observing storms as well rainfall since December 1997. This paper shows results of a systematic search through seven full years TRMM database to find indicators uncommonly intense storms. These include strong (> 40 dBZ) radar echoes extending great heights, high lightning flash rates, and very low brightness temperatures at 37 85 GHz. are used proxy variables, indicating powerful convective updrafts. main...
Abstract The Tropical Rainfall Measuring Mission (TRMM) satellite measurements from the precipitation radar and TRMM microwave imager have been combined to yield a comprehensive 3-yr database of features (PFs) throughout global Tropics (±36° latitude). PFs retrieved using this algorithm (which number nearly six million Tropicswide) sorted by size intensity ranging small shallow greater than 75 km2 in area large mesoscale convective systems (MCSs) according their ice scattering...
An algorithm has been developed to identify precipitation features (≥75 km2 in size) two land and ocean regions during August, September, October 1998. It uses data from instruments on the Tropical Rainfall Measuring Mission (TRMM) satellite: near-surface radar (PR) reflectivities, TRMM Microwave Imager (TMI) 85.5-GHz polarization corrected temperatures (PCTs). These were classified by size intensity criteria mesoscale convective systems (MCSs), with PCTs below 250 K, other without K. By...
Abstract Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR), TRMM Microwave Imager (TMI), and Visible Infrared Scanner (VIRS) observations within the Feature (PF) database have been analyzed to examine regional variability in rain area maximum horizontal extent of rainfall features, role storm morphology on production (and thus modes where vertically integrated heating occurs). Particular attention is focused sampling geometry PR resulting impact PF statistics across global...
Abstract An event-based method of analyzing the measurements from multiple satellite sensors is presented by using observations Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR), Microwave Imager (TMI), Visible and Infrared Scanner (VIRS), Lightning Imaging System (LIS). First, PR, VIRS, TMI, LIS are temporally spatially collocated. Then cloud features defined grouping contiguous pixels various criteria, including surface rain, cold infrared, or microwave brightness...
Abstract The Midlatitude Continental Convective Clouds Experiment (MC3E), a field program jointly led by the U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) Program and National Aeronautics Space Administration’s (NASA) Global Precipitation (GPM) mission, was conducted in south-central Oklahoma during April–May 2011. MC3E science objectives were motivated need to improve our understanding midlatitude continental convective cloud system life cycles, microphysics, GPM...
Abstract. The linkages between the space-time variability of observed clouds, rainfall, large-circulation patterns and topography in northern India Himalayas were investigated using remote sensing data. research purpose was to test hypothesis that cloudiness are dynamic tracers rainstorms, therefore their temporal spatial evolution can be used as a proxy organization precipitation processes Himalayan range during monsoon. results suggest distribution precipitation, diurnal cycle convective...
Abstract Cold cloud features (CCFs) are defined by grouping six full years of Tropical Rainfall Measuring Mission (TRMM) infrared pixels with brightness temperature at 10.8-μm wavelength (TB11) less than or equal to 210 and 235 K. Then the precipitation radar (PR)-observed area reflectivity profiles inside CCFs summarized compared minimum CCFs. Comparing data, significant regional differences found, quantified, used describe in selected properties deep convective systems Tropics. Inside 4...
Abstract During its first three years, the Tropical Rainfall Measuring Mission (TRMM) satellite observed nearly six million precipitation features. The population of features is sorted by lightning flash rate, minimum brightness temperature, maximum radar reflectivity, areal extent, and volumetric rainfall. For each these characteristics, essentially describing convective intensity or size features, broken into categories consisting top 0.001%, 0.01%, 0.1%, 1%, 2.4%, remaining 97.6%. set...
Covering December 1997 through 1998, 261 overpasses of 45 hurricanes by the Tropical Rainfall Measuring Mission (TRMM) satellite are used to document observed radar reflectivity values, passive microwave ice scattering magnitudes, and total lightning (cloud ground plus in cloud). These parameters interpreted as describing convective vigor or intensity, with greater reflectivities (particularly aloft), (lower 85- 37-GHz brightness temperatures), increased frequency indicating more intense...
Abstract Rainfall retrieval algorithms often assume a gamma-shaped raindrop size distribution (DSD) with three mathematical parameters N w , D m and μ . If only two independent measurements are available, as the dual-frequency precipitation radar on Global Precipitation Measurement (GPM) mission core satellite, then underconstrained require assumptions about DSD parameters. To reduce number of free parameters, can that is either constant or function Previous studies have suggested –Λ...
Abstract As a component of Earth’s hydrologic cycle, and especially at higher latitudes, falling snow creates snowpack accumulation that in turn provides large proportion the freshwater resources required by many communities throughout world. To assess relationships between remotely sensed measurements with situ measurements, winter field project, termed Global Precipitation Measurement (GPM) Cold Season Experiment (GCPEx), was carried out 2011/12 Ontario, Canada. Its goal to provide...
Abstract The link between stratiform precipitation microphysics and multifrequency radar observables is thoroughly investigated by exploiting simultaneous airborne in situ observations collected from two aircraft during the OLYMPEX/RADEX (Olympic Mountain Experiment/Radar Definition Experiment 2015) field campaign. Above melting level, images triple‐frequency signatures both indicate presence of moderately rimed aggregates. Various mass‐size relationships ice particles snow scattering...
Abstract This article provides an overview of the experimental design, execution, education and public outreach, data collection, initial scientific results from Remote Sensing Electrification, Lightning, Mesoscale/Microscale Processes with Adaptive Ground Observations (RELAMPAGO) field campaign. RELAMPAGO was a major campaign conducted in Córdoba Mendoza provinces Argentina western Rio Grande do Sul State Brazil 2018–19 that involved more than 200 scientists students United States,...
Abstract The Cloud, Aerosol, and Complex Terrain Interactions (CACTI) field campaign was designed to improve understanding of orographic cloud life cycles in relation surrounding atmospheric thermodynamic, flow, aerosol conditions. deployment the Sierras de Córdoba range north-central Argentina chosen because very frequent cumulus congestus, deep convection initiation, mesoscale convective organization uniquely observable from a fixed site. C-band Scanning Atmospheric Radiation Measurement...
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 bulk radar reflectivity structures, 85- and 37-GHz brightness temperatures, lightning characteristics of precipitating systems in tropical Africa, South America, the east Pacific, west Pacific are documented using data from Tropical Rainfall Measuring Mission (TRMM) satellite during August, September, October 1998. particular focus is on precipitation features [defined as a contiguous area ≥75 km2 with either near-surface ≥20 dBZ or an 85-GHz polarization-corrected temperature (PCT) ≤...
This study utilizes the Tropical Rainfall Measuring Mission (TRMM) satellite precipitation radar (PR), lightning imaging sensor (LIS), and passive microwave imager (TMI) data together with ground-based to investigate vertical structure, lightning, rainfall characteristics of Amazonian subtropical South American convection for three separate wet seasons. These are partitioned as a function 850-mb zonal wind direction, motivated by observations collected during 6-week TRMM–Large-scale...
To investigate processes related to the interaction of topography and precipitation, a tropics‐wide (±36° latitude) high resolution (0.1°) ten year (1998–2007) rainfall climatology is presented from Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) using algorithm 2A25 version 6 near‐surface rain. We observe tight coupling between with distinct precipitation‐topography relationships present in northwest South America Asia. An error model developed by subsampling TRMM...
Abstract This study examines the spatial and temporal variability in diurnal cycle of clouds precipitation tied to topography within North American Monsoon Experiment (NAME) tier-I domain during 2004 NAME enhanced observing period (EOP, July–August), with a focus on implications for high-resolution estimation core monsoon. Ground-based retrievals from Event Rain Gauge Network (NERN) Colorado State University–National Center Atmospheric Research (CSU–NCAR) version 2 radar composites over...
Abstract Size distributions and other geometric properties of mesoscale convective systems (MCSs), identified as clusters adjacent pixels exceeding a precipitation threshold in satellite radar images, are examined with respect to recently critical range water vapor. Satellite microwave estimates column vapor show that the onset convection tropics can be described phase transition, where rain rate likelihood rainfall suddenly increase function This is confirmed Tropical Rainfall Measuring...
Abstract Satellite observations have revealed that some of the world’s most intense deep convective storms occur near Sierras de Córdoba, Argentina, South America. A C-band, dual-polarization Doppler weather radar recently installed in city Córdoba 2015 is now providing a high-resolution perspective this convection. Radar data from two austral spring and summer seasons (2015–17) are used to document life cycle, while reanalysis utilized construct storm environments across region. Most region...
Abstract On 8 February 2018, a supercell storm produced gargantuan (>15 cm or >6 in. in maximum dimension) hail as it moved over the heavily populated city of Villa Carlos Paz Córdoba Province, Argentina. Observations are quite rare, but large population density here yielded numerous witnesses and social media pictures videos from this event that document multiple hailstones. The was also sampled by newly installed operational polarimetric C-band radar Córdoba. During RELAMPAGO...
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,...