中文摘要：

在三维混合相对流云模式中发展了盐粉催化方案,该方案考虑了盐粒与云雨滴和冰相粒子间的相互作用,模式中增加了盐溶滴的质量Qn和浓度Nn两个预报量。利用盐粉催化模式进行了个例模拟试验,并对催化结果进行了对比分析。结果表明,当采用30个.L-1剂量的盐粉两次催化时,催化效果较好,地面总降水量可增加10%;当催化剂量减少时,增雨效果不明显。同时催化剂量超过1 000个.L-1,可导致降水总量减少。催化时间提前或延后都会影响增雨效果。模拟第70min后出现了少量的减雨,并持续到降水结束。通过分析催化后云中水成物,发现盐粉催化不仅影响了暖雨过程,而且云雨滴通过冻结形成霰等过程也影响了冷雨过程。

英文摘要：

A salt-seeding scheme is developed in a 3-D convective cloud model, considering the micro- physical processes between the salt particle and liquid and ice particles. Two prognostic variables are added： mixing ratio and number concentration of salt particle （Qn and Nn）. Using the salt-seeding model, a series of seeding simulations are made. Good seeding effect can be produced by 30 L-1 seeding dose with two times seeding, which can caused total rainfall increased 10%, the rain enhancement effect is limited with less dose. Meanwhile, the total rainfall is reduced with seeding dose more than 1 000 L 1. Seeding time point also affect net rain enhancement amount. Seeding and natural clouds own the same precipitation time period. After 70th min, the negative seeding effect appeares to the end of precipitation, Salt seeding changes not only the warm cloud processes, but also the graupel and cold rain processes.