Standards

Oral

395146 - Experiments to Evaluate Cloud Seeding Materials using Cloud Chambers

Tuesday, June 5
8:30 AM - 10:00 AM
Location: Skyway Room

Cloud chambers are an important tool for determining the performance of seeding material used for precipitation enhancement projects. Experiments conducted in cloud chambers are important for understanding the physical processes involved in increasing precipitation since they provide a controlled environment for the formation of clouds. The Pi Cloud Chamber at Michigan Technological University (MTU) is an important facility for evaluating products used to increase precipitation in operational weather modification programs. The Pi Cloud Chamber allows the qualification of new formulations, methods, and techniques that has not been available since the decommissioning of the Colorado State Cloud Chamber in the late 1990s. Experiments that use cloud chambers enables the qualification of the ice number concentration which results from introduction of ice nuclei and the formation of large droplets from the introduction of hygroscopic seeding materials. To introduce material into a clouds chamber requires some type of injection system that dilutes the concentration so the cloud chamber is not contaminated and realistic of concentrations found in the atmosphere. Additionally, seeding material needs to be generated using the same methods as employed during operational weather modification programs. For example, seeding flares should be burned with air flow similar to a seeding aircraft. Large blowers can be used to produce the required air flow; however, blowers introduce particles that need to be removed with particle filters. A seeding flare burning system, coupled to a dilution system, has been developed and tested at the University of North Dakota. This injection systems enables cloud chambers to be used to improve cloud seeding materials.

David Delene, PhD

Associate Research Professor
University of North Dakota

Dr. David J. Delene, Associate Research Professor in the Department of Atmospheric Sciences at the University of North Dakota. r. Delene’s research interests include atmospheric aerosols, cloud physics, weather modification, and satellite remote sensing. Dr. Delene’s work has centered on making in situ measurements of cloud and aerosol properties to understand aerosol-cloud interaction and precipitation formation. Measurements from the research aircraft, along with radar, surface and satellite observations, provides new information for understanding cloud and precipitation processes. Dr. Delene has led airborne field projects in North Dakota, Saudi Arabia and Florida, and precipitation in NASA GPM validation field projects (MPACE, GCPEX, OLYMPEX). Recently, Dr. Delene has been involved with the NASA ORACLES project, provided scientific support for South Korea and China research aircrafts, and is conducting analysis of the CAPE2015 data set of in-situ measurements in thunderstorm anvils concurrent with the Navy's Mid-Course Doppler Radar (MCR). Analysis is ongoing of the CAPE 2015 dataset to compare MCR and aircraft measurements and improve the forecasting of cirrus clouds. Dr. Delene is the lead developer of the Airborne Data Processing And Analysis (ADPAA) software package that is used on several airborne platforms and is being actively developed by several scientists.

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