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阿联酋努力推进云层“播种降雨”技术

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发表于 2015-7-29 12:34:24 | 显示全部楼层 |阅读模式
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阿联酋收获云雨层
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在世界上位居前十的年降雨量小于100毫米的最干旱国家中,迪拜正努力从穿过这个沙漠国家的雨云中保存每一滴雨。

在Al Ain机场的一个专用的飞机编队,时刻做好准备向云层中发射含盐分的炮弹,希望增加水汽凝结成雨的数量。

这一被称为为云播种的过程由阿联酋国家气象和地震协会(NCMC)管理。它的天气雷达告诉飞行员们何时起飞向雨云中出击。

NCMS 飞行编队主管部门负责人Mark Newman 说:“一旦他们观察到对流云的形成,他们就会给我们发出飞行调查的任务努力给云层“播种”。”

Newman在Beechcraft King航空4个C90飞行编队的发言会上说夏季是任务最繁忙的季节。

夏季正好是云层形成于 Al Hajar东山的时候,温暖季风从阿曼海湾吹来。

上升气流的强度决定飞行编队在探索形成云层基础上发射导弹的数量。

他说:“如果我们遇到的是较弱的上升气流,我们一般会发射一到两颗导弹。如果我们遇到的是较强的上升气流,我们会发射4颗或者6颗导弹到云层中。”
Newman说并不是所有的已“播种”的云层会下雨,但多数情况下会发生。

阿联酋并不是使用云层播种的唯一的国家。美国科罗拉多州的滑雪场也使用过这种方法增加降雪量。中国同样在2008北京奥运会期间运用这种将于技术来应对干旱的天气。

努力推进云层播种降雨技术

今年的早些时候,阿联酋开展了一项价值18.35百万迪拉姆的国际项目来帮助找到解决饮用水缺乏的创新性办法。

NVMS一位负责人告诉Gulfnews记者,由NCMS带头,这个项目如期望促进阿联酋云层“播种”的进程。

一位负责人说这个项目如期望促进阿联酋云层“播种”的进程。这个云层播种项目与年降雨量小于100毫米的具有干旱气候的阿联酋国家密切相关,阿联酋国家具有较高的地表水蒸发率和较低的地下水位,NCMS行政长官和阿联酋世界气象组织永久代表Dr Abdullah Al Mandoos说道。

Al Mandoos 说:“此外,人口增长和经济膨胀会给目前的水资源供给以及降雨量带来附加的压力。这个项目已经致力于这些关注点以及促进全球干旱和半干旱地区水资源的保持。”

他说:“我们欢迎任何能够促进降水量的科学技术和研究。”


Harvesting clouds for rain in the UAE
(From gulfnews)

Among the world’s top ten most arid countries with less than 100mm rainfall per year, the UAE is striving to capture every drop of rain in can wring from the clouds that pass over the desert nation.

A dedicated fleet of planes at Al Ain airport stand ready to fire salt flares into clouds in the hope that the increased condensation will yield some rain.

The process, called cloud seeding, is run by the UAE’s National Centre of Meteorology and Seismology (NCMS). Its forecasters monitor weather radars to tell pilots when to take off on rainfall-inducing sorties.

“As soon as they see some convective cloud formations, they launch us on a flight to investigate” to try “to seed the cloud”, Mark Newman, deputy chief pilot at NCMS, told AFP.

Speaking at the base for a fleet of four Beechcraft King Air C90 aircraft, Newman said summer is usually the busiest season.

That is when clouds form over the eastern Al Hajar mountains which deflect the warm winds blowing from the Gulf of Oman.

The strength of the updraft determines the number of flares fired as the plane explores the base of the forming cloud.

“If we’ve got a mild updraft, we usually burn one or two flares. If we’ve got a good updraft, we burn four, sometimes six flares, into the cloud,” he said.

Not all seeded clouds produce rainfall, but it happens often, Newman said.

The UAE is not the only country to make use of cloud seeding. US ski resorts in Colorado reportedly use the method to induce heavier snowfall. China also used rain dispersal technology to ensure dry weather during the opening of the 2008 Beijing Olympics.

Efforts to boost cloud seeding programme

Earlier this year, a Dh18.35 million international grant was launched by the UAE to help find innovative solutions to the fresh water scarcity problem.

The programme, also spearheaded by NCMS, is expected to boost the UAE’s ongoing cloud-seeding programme, a senior official at NCMS told Gulf News earlier this year.

The programme is expected to boost the UAE’s ongoing cloud-seeding programme, a senior official said. The cloud-seeding programme is relevant in the UAE as it has an arid climate with less than 100mm per year of rainfall, a high evaporation rate of surface water and a low groundwater recharge [that is far less than the total annual water used in the country], said Dr Abdullah Al Mandoos, Executive Director at NCMS and the UAE’s permanent representative to the World Meteorological Organisation.

“Furthermore, the population increase and economic expansion will put additional pressure on existing water supplies and rainfall in the country. This programme has been launched to address these concerns and to advance the development of sustainable approaches for providing water to arid and semi-arid regions across the globe,” Al Mandoos said.

“We are open to any technology or research that can produce more rain,” he said.
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