Randomized Cloud Seeding at Gutian, Fujian, China

Authors

  • Jia-dong Yeh Department of Meteorology, Nanjing University
  • Ke-ming Cheng Institute of Meteorology, Weather Bureau of Fujian Province
  • Guang-ping Zhen Institute of Meteorology, Weather Bureau of Fujian Province

DOI:

https://doi.org/10.54782/jwm.v14i1.69

Abstract

To increase rainfall over the watershed of Gutian reservoir, halfway from Shanghai to Canton and 100 km inland from Taiwan strait, metaldehyde and silver iodide were injected by rocket into clouds during three seasons, April-June 1975, 1977, and 1981. Randomization provided 50 seeded and 51 unseeded three-hour cases, indicating a 20% increase (significant at 5% level) in mean rainfall over the 1500 km target, mostly in frontal situations. Fourthroot transformations provided adequate transformation to normality of the threehour rainfall totals. Residual variances of regressions of seeded and unseeded cases differed markedly, requiring special analyses. Contrary to previous assumptions, seeding effects were not proportional to control area rainfall, and regression intercepts were not zero.

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How to Cite

Yeh, J.- dong, Cheng, K.- ming, & Zhen, G.- ping. (1982). Randomized Cloud Seeding at Gutian, Fujian, China. The Journal of Weather Modification, 14(1), 53–60. https://doi.org/10.54782/jwm.v14i1.69

Issue

Section

Scientific Papers