The Nature of Winter Clouds and Precipitation in the Cascade Mountains and their Modification by Artificial Seeding. Part III: Case Studies of the Effects of Seeding
The Nature of Winter Clouds and Precipitation in the Cascade Mountains and their Modification by Artificial Seeding. Part III: Case Studies of the Effects of Seeding
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喀斯喀特山脉冬季云和降水的性质及其人工播种的改变。
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
P. Hobbs
中科院分区：
文献类型：
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作者：
P. Hobbs
本文描述了三个案例研究，其中详细的空中和地面观测，以评估从空中人工播撒对云结构和地面降雪的影响，在一个小的预定目标区在喀斯喀特山脉。1972年1月31日，在喀斯喀顶以西的层积云中大量播撒了碘化银72分钟。航空观测显示，人工播撒使云层冰化，出现新的晶型，对流活动增强。粒子轨迹分析表明，目标区域的降雪应该是受播撒的影响。在预报播种期间，在目标区域靠近梯级峰的地面上，出现了新的雪晶型，结圈减少，降雪中冻结核增多，降雪率降低。再往东，目标区域出现了新的晶型，降雪中的冻结核增加，…
Abstract Three case studies are described in which detailed airborne and ground observations were made in order to evaluate the effects of artificial seeding from the air on cloud structure and snowfall on the ground in a small predetermined target area in the Cascade Mountains. On 31 January 1972, stratocumulus clouds just west of the Cascade crest were heavily seeded with silver iodide for 72 min. Airborne observations showed that the clouds were glaciated by the artificial seeding, new crystal types appeared, and there was an increase in convective activity. Particle trajectory analysis showed that snowfall in the target area should have been affected by the seeding. On the ground in the target area near the Cascade crest new snow crystal types appeared, riming decreased, freezing nuclei in the snowfall increased, and the snowfall rate decreased during the predicted period-of-effect (PPE) of seeding. Further east in the target area, new crystal types appeared, freezing nuclei in the snowfall increased,...