最近30从www.hoelymoley.com 2023 - 07 - 07 - t18:23:10z //www.hoelymoley.com/feeds/question/6963 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/6963 4 user15523 //www.hoelymoley.com/users/4859 2015 - 11 - 21 - t21:09:32z 2015 - 11 - 22 - t08:29:46z

< p >我听说干冰,碘化被用作播种代理< em >导致降雨的< / em >。这种技术真的是被广泛使用?开始播种的先决条件是什么?一样丰富的自然降雨吗? < / p >

//www.hoelymoley.com/questions/6963/-/6966 # 6966 4 戈登斯坦格 //www.hoelymoley.com/users/4507 2015 - 11 - 22 - t08:29:46z 2015 - 11 - 22 - t08:29:46z

< p >播云已经尝试了超过一个世纪,有些已经成功了。毫无疑问,,< em > < / em >本地,雨可以增加了播种的云底等成核剂干冰、碘化银烟。有一个很大的疑问,是否有整体获得降雨——或者仅仅是一个昂贵的“拆东墙补西墙”的方式,增加降雨雨在一个地方以牺牲进一步顺风。有净收益在地区降雨吗?可能不会。当然,在许多情况下,< em > < / em >本地降雨增加可能是值得的。< / p > < p >并不是所有情况下云种散播的工作。有几个要求。首先,这个过程包括剧烈的对流云塔为了阁楼内成核剂成足够完工后云的一部分。如果云太温暖它不会工作,排除了许多热带的应用程序。 Second, the 'seed' has to be injected into the cloud base at about -10 to -20 deg C, which allows 'graupel' to form, i.e. a kind of granular ice that flash freezes onto snow or ice crystals direct from super-cooled water vapour. Third, the timing has to be right, just as the cumulus towers are beginning to form, usually in the early afternoon. Fourthy, the economics are very moot. Wikipedia ('Cloud Seeding') claims that the subject is no longer 'fringe science', which is true in that the physics have been studied seriously, but mostly untrue in the sense that it is now considered economically attractive. The great majority of studies have shown that cloud seeding is unreliable, expensive, and of dubious value, with other ways of delivering water (such as desalination) being a better bet.

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