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<br /> <br />Figure 3. Multi-spectral analysis of satellite image from NOAA-16 polar-orbiting satellite on 11 January <br />2005. The colors are derived from red-green-blue combinations based on coding various combinations of <br />visible reflectance. temperature and cloud-top effective radius (size of cloud hydrometeors). Yellow-white <br />areas are clouds composed of many smaller hydromeleors, typical of continental clouds that are less <br />likely to produce precipitation by the coalescence process. Reddish areas are clouds that have more <br />maritime pristine structure, with fewer but larger hydrometeors, thereby more likely 10 generate <br />precipitation. Plots on the right correspond to the numbered areas on Ihe satellite image and show sizes <br />of particles or effective radius r (on x-axis. in micrometers) vs. temperature in "C (on y-axis). Note that <br />area 2, downwind of Los Angeles. has much smaller particles r than in other more pristine areas. Source: <br />Daniel Rosenfeld. Hebrew University of Jerusalem, presented at 16111 Conference on Planned and <br />Inadvertent Weather Modification, San Diego, CA, January 2005. <br /> <br />Because of the ramifications of the anthropogenic lindings for hydroelectric power generation in <br />California. studies of how aerosols atTect clouds and prccipitation in the Sierra Nevada have <br />been continued WIthin the Suppression of I'recipitation (SUPRECIP) Experiment. The <br />SUPRECIP. which is being funded by the Public Interest Energy Research (PIER) Program of <br />the California Energy Commission (CEC). had major tield campaigns in the winters of2005 and <br />2006. In 2006. extensivc measurements \\'ere made in Sierra clouds with a \vell-equipped <br />Cheyenne-2 cloud physics aircraft and a Cessna 340 (mostly cloud-base) aerosol aircraft. <br />Measurements were made in deep. mostly glaciated clouds. and in relatively shallow clouds <br />,....hose liquid water was mostly supercooled (colder than the freezing point). Analysis of the <br />unique SUPRECIP data set is underway. toward the goal of documenting the etTects of aerosols <br />on Sierra clouds and precipitation. These data should also be a valuable resource tor optimizing <br />cloud seeding in the region. <br /> <br />10 <br />