期刊
EARTH AND SPACE SCIENCE
卷 7, 期 8, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020EA001196
关键词
cloud seeding; ice crystal; particle size distribution; evaluation; supercooled liquid clouds
资金
- National Key Research and Development Program of China [2019YFA0606803, 2017YFC1501403, 2018YFC1507900]
- National Natural Science Foundation of China [41925022, 91837204, 41575143]
- Hebei province Key Research and Development project [20375402D]
- State Key Laboratory of Earth Surface Processes and Resource Ecology
- Key Laboratory for Cloud Physics of China Meteorological Administration [2019Z01601]
Cloud plays essential roles to Earth's energy balance and hydrological cycle. Its characteristics could be modified by human activities through cloud seeding. However, there is long-lasting debate whether the cloud seeding can modify the clouds to introduce or change precipitation effectively, due to the challenge that the effect of cloud seeding is difficult to be evaluated. Using the data from a cloud seeding experiment, this study investigates the differences of cloud properties between before and after the cloud seeding for a supercooled liquid cloud. It shows that before the cloud seeding, the clouds are supercooled liquid phase clouds. After cloud seeding, the observations from both the cloud particle images and cloud particle size distributions indicate the occurrence of large ice crystal particles and the broadening of particle size distribution. Thus, much larger and much more ice crystal particles occurred after the cloud seeding, which could further grow into precipitation particles through collision-coalescence process. Satellite image further shows the formation of precipitation clearly after the cloud seeding experiment. This study suggests that cloud seeding can work efficiently for supercooled liquid clouds.
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