A numerical comparison study of cloud seeding by silver iodide and liquid carbon dioxide |
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| Institution: | 1. Key Laboratory for Cloud Physics, Chinese Academy of Meteorological Sciences, Beijing 100081, China;2. Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD 20742, USA;3. Beijing Weather Modification Office, Beijing 100081, China;1. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China;2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, 210044, China;3. University of Chinese Academy of Sciences, Beijing, 100049, China;4. Department of Atmospheric Science, School of Environment Studies, China University of Geosciences, Wuhan, 430074, China;5. Shanghai Meteorological Service, Shanghai, 200030, China;1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China;2. Key Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;3. Jilin Province Technology Center for Meteorological Disaster Prevention, Changchun, China;4. Institute of Desert Meteorology, China Meteorological Administration, Urumqi, China;1. Department of Atmospheric Science, University of Wyoming, Laramie, WY 82071, USA;2. Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80309, USA;3. Research Application Laboratory, National Center for Atmospheric Research, Boulder, CO 80307, USA |
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| Abstract: | A comparison study on dynamic and microphysical effects of cloud seeding by silver iodide (AgI) and liquid carbon dioxide (liquid CO2) was made using a 3D cloud model with seeding processes. The model was initialized based on the rawinsonde sounding taken from Pinliang station located in the western China on 20 April 2001. The sounding air reflects moist and stable characteristics at middle and low layers. The model results show that the seeding by liquid CO2 and AgI at ? 15 to ? 20 °C levels of cloud has almost the same dynamic effect on the simulated clouds. The seeding is able to induce the formation of weak convective cells in both seeded and unseeded regions due to latent heat released by the transformation from liquid saturation to ice saturation. However, the initial seeding conducted by liquid CO2 in the region of maximum supercooled water with temperature of 0 to ? 5 °C enable to produce much stronger dynamic effect and precipitation by forming many convective new cells at low levels in the later stage of seeded clouds. The accumulated precipitation at the surface can be increased and redistributed, and more concentrated in the downstream region of seeded clouds. |
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