Research on the development of basic technique of artificial rainfall to non-precipitation clouds above the Genkai sea in the Northern Kyushu, Japan

由于全球气候变暖的影响，日本近年来多次发生由极少量降雨引发的干旱。为了解决这些问题，Fukuta（1996）提出了一种利用液态二氧化碳（LCD）进行人工降雨的新方法。这种新的方法包括使用LCD通过均匀成核产生冰粒和随后的更有效的生长冰粒没有竞争过程。在我们的研究中，三个LCD播种实验应用于2013年12月26日在日本九州北方的加拉津市上空形成的过冷云（层）。实验时间为120 s，LCD每次播种速率为11.1g/s。播种高度为2500 ~ 2650 m。云层厚度约2600米。播后约45分钟，JMA雷达回波出现，这些回波由西南向东北移动了35分钟。我们证实了这些回声导致下雨。我们就能成功地穿越层云。

Because of the impact of global warming, many droughts have broken out by extreme small amount rainfall in recent Japan. So as to solve these problems, new artificial rainfall method using the liquid carbon dioxide (LCD) was proposed by Fukuta (1996). This new method consists of the generation of ice particles by homogeneous nucleation using LCD and the subsequent more effective growth for ice particles without competition process. In our study,the three LCD seeding experiments were applied to the super-cooled clouds (strata) formed over Karatsu City in the northern part of Kyushu, Japan on December 26, 2013. Each time of the experiments was 120 seconds, and each seeding rate of LCD was 11.1g/s. And, the seeding height was 2500m to 2650m. The thickness of cloud was about 2600m. About 45 min. after seeding the JMA radar echoes appeared.These echoes moved to from SW to NE for 35min.. We verified that it rained from these echoes. We could succeeded the stratus.