A5087393269- Meteorological Phenomena and Simulations
- Lightning and Electromagnetic Phenomena
- Precipitation Measurement and Analysis
- Climate variability and models
- Fire effects on ecosystems
- Atmospheric aerosols and clouds
- Tropical and Extratropical Cyclones Research
- Atmospheric chemistry and aerosols
- Soil Moisture and Remote Sensing
- Ionosphere and magnetosphere dynamics
- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Cryospheric studies and observations
- Aeolian processes and effects
- Geophysics and Gravity Measurements
- Plant responses to water stress
- Atmospheric Ozone and Climate
- Plant Water Relations and Carbon Dynamics
- Solar and Space Plasma Dynamics
- Icing and De-icing Technologies
- Atmospheric and Environmental Gas Dynamics
- Plant Surface Properties and Treatments
- Radio Wave Propagation Studies
- Thermal Analysis in Power Transmission
- Plant responses to elevated CO2
Colorado State University
2015-2025
Sun Yat-sen University
2020
American Meteorological Society
2006-2019
Radar (United States)
2018
Chicago State University
2011
University of Chicago
2011
Yankee Environmental System (United States)
2006-2008
Financial Management Association International
2008
National Institute of Meteorology
2007
Impact
2007
It has long been known that trade wind cumulus and deep cumulonimbus represent primary components of the broad spectrum clouds in Tropics, which led to concept a bimodal distribution tropical clouds. However, recent analyses shipboard radar data from Tropical Ocean Global Atmosphere Coupled Ocean‐Atmosphere Response Experiment (COARE) provide evidence abundant populations third cloud type, congestus. Congestus constitute over half precipitating convective COARE contribute one-quarter total...
Previous field studies have indicated that warm-frontal rainbands form when ice particles from a “seeder” cloud grow as they fall through lower-level “feeder” cloud. In this paper we present results parameterized numerical model of the growth processes can lead to enhancement precipitation in “seeder-feeder” type situation. The is applied two types rainbands. first (Type 1 situation) vertical air motions are typical those associated with slow, widespread lifting vicinity warm fronts. second...
The highest precipitation rates in midlatitude cyclones are often associated with the narrow cold-frontal rainband. In this paper formation of type rainband is analyzed aid a diagnostic cloud model and field measurements. Model results indicate that high rainbands graupel. graupel forms when ice particles, which originate stratiform ahead rainband, grow rapidly by riming after entering strong updraft (and hence region liquid water content) When source input particles not present somewhat...
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 This second part of a two-part study examines the lightning and charge structure evolution 29 June 2000 tornadic supercell observed during Severe Thunderstorm Electrification Precipitation Study (STEPS). Data from National Lightning Detection Network New Mexico Tech Mapping Array (LMA) are used to quantify total cloud-to-ground (CG) flash rates. Additionally, LMA data infer gross determine origin locations regions involved in CG flashes. The rate reached nearly 300 min−1 was well...
Abstract The Deep Convective Clouds and Chemistry (DC3) field experiment produced an exceptional dataset on thunderstorms, including their dynamical, physical, electrical structures impact the chemical composition of troposphere. gathered detailed information inflow outflow regions midlatitude thunderstorms in northeast Colorado, west Texas to central Oklahoma, northern Alabama. A unique aspect DC3 strategy was locate sample convective a day after active convection order measure...
Abstract During the second week of September 2013, a seasonally uncharacteristic weather pattern stalled over Rocky Mountain Front Range region northern Colorado bringing with it copious amounts moisture from Gulf Mexico, Caribbean Sea, and tropical eastern Pacific Ocean. This feed was funneled toward east-facing mountain slopes through series mesoscale circulation features, resulting in several days unusually widespread heavy rainfall steep mountainous terrain. Catastrophic flooding ensued...
OLYMPEX is a comprehensive field campaign to study how precipitation in Pacific storms modified by passage over coastal mountains.
This paper presents an overview of the results from first major mesoscale atmospheric campaign Large‐Scale Biosphere‐Atmosphere Experiment in Amazonia (LBA) Program. The campaign, collocated with a Tropical Rainfall Measuring Mission (TRMM) satellite validation campaigns, was conducted southwest Rondônia January and February 1999 during wet season. Highlights on interaction between clouds, rain, underlying landscape through biospheric processes are presented discussed.
Microphysical processes responsible for the formation and dissipation of water ice clouds have been incorporated into Colorado State University General Circulation Model in order to 1) yield a more physically based representation components atmospheric moisture budget, 2) link distribution optical properties model-generated predicted cloud amounts, 3) produce realistic simulations cloudiness earth's radiation budget. The bulk microphysics scheme encompasses five prognostic variables mass...
Observation of the vertical profile precipitation over global Tropics is a key objective Tropical Rainfall Measuring Mission (TRMM) because this information central to obtaining profiles latent heating. This study combines both TRMM radar (PR) and Lightning Imaging Sensor (LIS) data examine “wet-season” structures tropical across broad spectrum locations in Tropics. TRMM-PR reflectivity (2A25 algorithm) were utilized produce seasonal mean three-dimensional relative frequency histograms ice...
Ratios of area mean rainfall and cloud‐to‐ground lightning flash count (termed “rain yields”) were computed for several different locations around the globe, over temporal spatial scales 1 month 10 4 –10 5 km 2 , respectively. Values rain yield clustered near 8 kg/fl a large portion midcontinental United States. Rain yields slightly lower arid southwestern States, averaging ∼6×10 7 kg/fl. In tropical increased systematically from continental value 4×10 to western Pacific Ocean. The observed...
DUNDEE (Down Under Doppler and Electricity Experiment) is described. was carried out in the vicinity of Darwin, Northern Territory, Australia, during wet seasons November 1988 through February 1989, 1989 1990. The general goal to investigate dynamical electrical properties tropical mesoscale convective systems isolated deep storms. situated at southern tip "maritime continent," experiences both monsoon "break" period conditions season. We discuss observational network deployed for present...
This study uses TRMM lightning and radar observations to the fundamental relationship between precipitation ice mass flash density. The results indicate that physical assumptions of precipitation‐based charging mixed phase development are robust on a global scale , water path density is relatively invariant land, ocean coastal regimes. Hence data may be useful variable for inclusion in combined space borne algorithms designed retrieve content.
One of the primary scientific objectives Maritime Continent Thunderstorm Experiment was to study cloud electrification processes in tropical island convection, particular, coupling between ice phase precipitation and lightning production. To accomplish this goal, a C-band polarimetric radar deployed Tropics (11.68S, 130.88E) for first time, accompanied by suite measurements. Using observations propagation-corrected horizontal reflectivity differential reflectivity, along with specific phase,...
Abstract The efficacy of dual-polarization radar for quantitative precipitation estimation (QPE) has been demonstrated in a number previous studies. Specifically, rainfall retrievals using combinations reflectivity (Zh), differential (Zdr), and specific phase (Kdp) have advantages over traditional Z–R methods because more information about the drop size distribution (DSD) hydrometeor type are available. In addition, dual-polarization-based rain-rate estimators can better account presence ice...
During May–July 2000, the Severe Thunderstorm Electrification and Precipitation Study (STEPS) occurred in High Plains, near Colorado–Kansas border. STEPS aimed to achieve a better understanding of interactions between kinematics, precipitation, electrification severe thunderstorms. Specific scientific objectives included 1) apparent major differences precipitation output from supercells that have led them being classified as low (LP), classic or medium high precipitation; 2) lightning...
The occurrence frequency and rainfall production of mesoscale convective systems (MCSs) relative to smaller groups clouds over the tropical oceans is not well known. Eighty days shipboard radar data collected during recent Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment (TOGA COARE) were used provide a detailed view convection in western Pacific warm pool, region global climatological significance. aim this study was document occurrence, production, depth...
Using data from the 11 cm, CSU‐CHILL multiparameter radar, simultaneous evolution of radar‐inferred precipitation structure and electrical characteristics a severe hailstorm is investigated. We compare substorm point discharge current, intracloud (IC) lightning flash rate, cloud‐to‐ground (CG) ground strike location, polarity to progression types amounts. This study unique in that it presents radar observations thunderstorm complex which exhibited an extremely high IC‐to‐CG ratio (IC/CG,...
Abstract Although much work has been done at S band to automatically identify hydrometeors by using polarimetric radar, several challenges are presented when adapting such algorithms X band. At band, attenuation and non-Rayleigh scattering can pose significant problems. This study seeks develop a hydrometeor identification (HID) algorithm for based on theoretical simulations the T-matrix model of seven different types: rain, drizzle, aggregates, pristine ice crystals, low-density graupel,...
Abstract This study is based on analyses of dual-polarization radar observations made by the 11-cm-wavelength Colorado State University–University Chicago–Illinois Water Survey (CSU–CHILL) system during four significant winter storms in northeastern Colorado. It was found that values specific differential phase K DP often reached local maxima ∼0.15°–0.4° km −1 an elevated layer near −15°C environmental temperature isotherm. The passage these positive areas shown to be linked increased...
Abstract The 3D Goddard Cumulus Ensemble model is used to simulate two convective events observed during the Tropical Rainfall Measuring Mission Large-Scale Biosphere–Atmosphere (TRMM LBA) experiment in Brazil. These epitomized type of systems that formed distinctly different environments TRMM LBA. 26 January 1999 squall line within a sheared low-level easterly wind flow. On 23 February 1999, convection developed weak westerly flow, resulting weakly organized, less intense convection....
Abstract A new 10-category, polarimetric-based hydrometeor identification algorithm (HID) for C band is developed from theoretical scattering simulations including wet snow, hail, and big drops/melting hail. The HID applied to data seven seasons in Darwin, Australia, using the polarimetric C-band (C-POL) radar, investigate microphysical differences between monsoon break periods. Scattering reveal significant Mie effects with large hail (diameter > 1.5 cm), reduced reflectivity enhanced...
Understanding drop size distribution (DSD) variability has important implications for remote sensing and numerical modeling applications. Twelve disdrometer datasets across three latitude bands are analyzed in this study, spanning a broad range of precipitation regimes: light rain, orographic, deep convective, organized midlatitude, tropical oceanic. Principal component analysis (PCA) is used to reveal comprehensive modes global DSD spatial temporal variability. Although the locations...