Recorded presentation6.3
Studies of Background Cloud Condensation Nucleus Population Characteristics in the Northern High Plains
A. Detwiler, South Dakota School of Mines & Technology, Rapid City, South Dakota
Experiments in several locations with seeding of continental convective clouds with micrometer-size hygroscopic aerosol suggest precipitation enhancement is possible by this technique. Initial numerical simulations of such seeding for the most part supported this concept. However, very recent numerical simulations for a wider variety of atmospheric vertical buoyancy and wind profiles have shown that in some situations hygroscopic seeding apparently may produce precipitation enhancements, and in others decreases. A review of past cloud condensation nuclei (CCN) observations and new observations obtained in 2004 shows that considerable variability in CCN characteristics can occur at continental sites. It is concluded that guidance for hygroscopic seeding operations should include observations and forecasts of both vertical profiles of stability and winds, and CCN in cloud inflow. Recorded presentation
Session 6, RECENT DEVELOPMENTS IN UNDERSTANDING NATURAL CLOUD PROCESSES AND AEROSOL CLOUD INTERACTIONS AND HOW THEY MIGHT BE MODIFIED - Part 2
Tuesday, 11 January 2005, 1:30 PM-3:00 PM
Previous paper Next paper