A5008205928- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Aeolian processes and effects
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Air Traffic Management and Optimization
- Geophysics and Gravity Measurements
- Climate variability and models
- Particle Dynamics in Fluid Flows
- Aerospace and Aviation Technology
- Precipitation Measurement and Analysis
- Icing and De-icing Technologies
- Solar Radiation and Photovoltaics
- Air Quality and Health Impacts
- Cryospheric studies and observations
- Atmospheric and Environmental Gas Dynamics
- UAV Applications and Optimization
- Solar and Space Plasma Dynamics
- Arctic and Antarctic ice dynamics
- Cyclone Separators and Fluid Dynamics
- Tropical and Extratropical Cyclones Research
- Air Quality Monitoring and Forecasting
- Astrophysics and Star Formation Studies
- Impact of AI and Big Data on Business and Society
- Advanced Aircraft Design and Technologies
Scripps Institution of Oceanography
2021-2024
University of California, San Diego
2021-2024
Indian Institute of Tropical Meteorology
2023
Ministry of Earth Sciences
2023
Droplet Measurement Technologies (United States)
2017-2020
University of Denver
2013-2019
NSF National Center for Atmospheric Research
2010-2018
Research Applications (United States)
2012-2017
University Corporation for Atmospheric Research
2015
Research Applications Laboratory
2012
Mixed-phase clouds represent a three-phase colloidal system consisting of water vapor, ice particles, and coexisting supercooled liquid droplets. are ubiquitous in the troposphere, occurring at all latitudes from polar regions to tropics. Because their widespread nature, mixed-phase processes play critical roles life cycle clouds, precipitation formation, cloud electrification, radiative energy balance on both regional global scales. Yet, spite many decades observations theoretical studies,...
Understanding the formation and evolution of ice in clouds requires detailed information on size, shape, mass, optical properties individual cloud hydrometeors their bulk over a broad range atmospheric conditions. Since 1960s, instrumentation research aircraft have evolved, providing increasingly more accurate larger quantities data about particle properties. In this chapter, current status electrical powered, situ measurement systems are reviewed with respect to strengths weaknesses...
Abstract In situ observations of cloud properties made by airborne probes play a critical role in ice research through their process studies, parameterization development, and evaluation simulations remote sensing retrievals. To determine how vary with environmental conditions, data collected during different field projects processed groups must be used. However, because the diverse algorithms codes that are used to measurements, it can challenging compare results. Therefore is vital...
Abstract Atmospheric ice nucleating particles (INPs) influence global climate by altering cloud formation, lifetime, and precipitation efficiency. The role of secondary organic aerosol (SOA) material as a source INPs in the ambient atmosphere has not been well defined. Here, we demonstrate potential for biogenic SOA to activate depositional upper troposphere combining field measurements with laboratory experiments. Ambient were measured remote mountaintop location at –46 °C an...
Recent publications suggest that anthropogenic aerosols suppress orographic precipitation in California and elsewhere. A field campaign (SUPRECIP: Suppression of Precipitation) was conducted to investigate this hypothesized aerosol effect. The consisted situ aircraft measurements the polluting aerosols, composition clouds ingesting them, way precipitation‐forming processes are affected. SUPRECIP during February March 2005 2006. flights documented flowing into central Sierra Nevada from...
The combined effect of humidity and aerosol on cloud droplet spectral width ( σ ) in continental monsoon clouds is a topic significant relevance for precipitation radiation budgets over regions. polluted, dry premonsoon conditions moist observed near the Himalayan Foothills region during Cloud Aerosol Interaction Precipitation Enhancement EXperiment (CAIPEEX) focus this study. Here small developing from boundary layers. This attributed to numerous particles absence/suppression...
Abstract Ice-phase precipitation occurs at Earth’s surface and may include various types of pristine crystals, rimed freezing droplets, secondary aggregates, graupel, hail, or combinations any these. Formation ice-phase is directly related to environmental cloud meteorological parameters that available moisture, temperature, three-dimensional wind speed turbulence, as well processes nucleation, cooling rate, microphysics. Cloud microphysical in the numerical models are resolved based on such...
Abstract. Water is the single most important element of life. Rainfall plays an role in spatial and temporal distribution this precious natural resource, it has a direct impact on agricultural production, daily life activities, human health. One elements that govern rainfall formation atmospheric aerosol, which also affects Earth's radiation balance climate. Therefore, understanding how dust compositions distributions affect regional pattern crucial, particularly regions with high loads such...
We successfully implemented a framework involving an uncrewed aircraft system (UAS) with atmospheric and cloud microphysical sensing autonomous adaptive control technologies to search, identify, carry out, monitor and/or evaluate seeding operations enhance precipitation. This first-time implementation featured trials in the U.S. Great Plains area following US aviation authority regulations during three-week summer trial period. The provide insight into using UAS operational setting. Their...
Abstract The demand for effective methods to augment precipitation over arid regions of India has been increasing the past several decades as changing climate brings warmer average temperatures. In fourth phase Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX IV), a scientific investigation was conducted rain-shadow region Western Ghats mountains in India. primary objective investigate efficacy hygroscopic seeding convective clouds develop cloud protocol. CAIPEEX...
Abstract It is shown here that hygroscopic seeding requires two orders of magnitude more agent than can be delivered by flare technology for producing raindrop embryos in concentrations to detect cloud physics aircraft the microphysical signature rain initiation. An alternative method finely milled salt powder capable achieving this goal. During field experiments use a sulfur hexafluoride (SF6) gas tracer identify exact seeded volume and quantify dilution showed dilutes order 10−10 its...
As a response to extreme water shortages in southeast Queensland, Australia, brought about by reduced rainfall and increasing population, the Queensland government decided explore potential for cloud seeding enhance rainfall. The Cloud Seeding Research Program (QCSRP) was conducted region near Brisbane during 2008/09 wet seasons. In addition conducting an initial exploratory, randomized (statistical) study, multiparameter radar measurements situ aircraft microphysical data were collected....
Scale interactions associated with small scale (<100 km) dynamics might play a crucial role in the distribution of aerosol Himalayan foothills region. Turbulence measurements from horizontal flight path during Cloud Aerosol Interaction and Precipitation Enhancement EXperiment (CAIPEEX) are used to illustrate vertically sheared flow below high‐level subtropical westerly jet, which is important transport pollution. Data analysis reveals three dimensional property large eddies that 10–12 km...
Abstract. Flight data measured in warm convective clouds near Istanbul June 2008 were used to investigate the relative dispersion of cloud droplet size distribution. The (&amp;varepsilon;), defined as ratio between standard deviation (σ) distribution and average radius (⟨r⟩), is a key factor regional global models. relationship ε clouds' microphysical thermodynamic characteristics examined. results show that constrained with values range ~0.25–0.35. shown not be correlated concentration...
Present-day weather modification technologies are scientifically based and have made controlled technological advances since the late 1990s, early 2000s. The directly related to primarily been in decision support evaluation software modeling areas. However, there some other fields that might now be advanced enough start considering their usefulness for improving operational efficiency accuracy. We consider programmatic aspects underlying development of new use activities, identifying...
Abstract A comprehensive analysis of particle size distributions measured in situ with airborne instrumentation during the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) is presented. In observations developing stage continental convective clouds premonsoon (PRE), transition, monsoon (MON) period at temperatures from 25 to −22°C are used study. The PRE have narrow drop compared showed less development spectra decrease temperature. Overall, cases had much lower...
Abstract Strong mesoscale haboob dust storms in April 2007 the central Arabian Peninsula were studied using cloud‐resolving Weather Research and Forecasting‐Chemistry (WRF‐Chem) modeling system observations collected during an intensive atmospheric field campaign. The campaign provided valuable aircraft Doppler weather radar measurements. Active convection persisted for several days study period. Dust generation was caused by both strong large‐scale winds locally produced density currents....
This paper builds upon the processes and framework already established for identifying, integrating testing an unmanned aircraft system (UAS) with sensing technology use in rainfall enhancement cloud seeding programs to carry out operational activities or monitor evaluate operations. We describe development assessment methodologies of autonomous adaptive UAS platform that utilizes in-situ real time data sense, target implement seeding. The a remote real-time deployed companion ensures...