Science. 1970 Oct 9;170(3954):127-32. doi: 10.1126/science.170.3954.127.
In summary, the following points are made: 1) There are essentially two approaches to seeding for rain inducement, static and dynamic. 2) The dynamic approach is effective in inducing growth and increasing precipitation from individually seeded convective clouds under specifiable conditions. 3) The static approach to seeding for precipitation increases is apparently not relevant to the summer cumuli of Florida and Missouri. 4) Regional seeding climatologies, including studies of natural freezing processes in convective clouds, should be completed before commencement of a seeding operation. 5) The results of a seeding operation are frequently better understood by stratification of the data, especially with respect to weather conditions. Precipitation increases from seeding are usually found under fair weather regimes with isolated showers, whereas decreases are often noted under naturally rainy conditions.
总之，以下几点是明确的：1）人工增雨主要有静态和动态两种方法。2）在特定条件下，动态方法可有效促进积云对流的生长并增加降水。3）静态方法对佛罗里达州和密苏里州夏季积云似乎不适用。4）在开展人工增雨作业之前，应完成包括对流云自然冷冻过程研究在内的区域增雨气候学研究。5）对数据进行分层，特别是对天气条件进行分层，往往有助于更好地理解人工增雨作业的结果。通常在晴朗天气且有孤立阵雨的情况下会发现降水增加，而在自然降雨条件下通常会出现降水减少的情况。
