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Military, NTU team collaborate on trying to make rain

Military, NTU team collaborate on trying to make rain

Taipei, April 2 (CNA) Taiwan's Air Force and a meteorological team from National Taiwan University (NTU) , with help on the ground from the Water Resources Agency (WRA) , launched an offensive Friday to try to induce rainfall in drought-plagued southern Taiwan, according to a WRA official.
A squad of C-130 transport aircraft Air Force released some 4,000 liters of water from an altitude of 15,000 feet and targeted it at the water catchment areas of the Tsengwen, Wushantou and Nanhua reservoirs in Tainan and Chiayi counties, hoping to induce more rain in the region, WRA Deputy Director-General Wu Yueh-si said.
At the same time, an NTU team led by Department of Atmospheric Sciences associate professor Lin Po-hsiung was trying to seed clouds to create rain over the water catchment areas, Wu noted, but neither of the approaches produced immediate results.
Taiwan normally uses cold-cloud seeding, but on Friday the team opted for warm-cloud seeding, where an aerosol, in this case calcium-chloride based, is sprayed into clouds rather than above them.
NTU'S Lin said there will be cold fronts approaching Taiwan in the coming days and current weather conditions are suitable for making rain by using warm-cloud seeding, used to generate rain in upper air cloud layers when their temperature is above 10 degrees Celsius.
Cold-cloud seeding, Lin said, is used when the temperature of those cloud layers is below 10 degrees C.
According to Wu, his agency will review Friday's operation and renew rain making efforts early next week when weather fronts pass over Taiwan.
The water supply across Taiwan is secure through the end of July, but the situation in the greater Kaohsiung area is riskier, Wu explained.
No rain has fallen in parts of southern Taiwan since Typhoon Morakot devastated that part of the country last August. Spring rice planting in some areas of central and southern Taiwan was suspended to save water.
(By Z. H. Kuo and Flor Wang)




Updated : 2021-04-11 18:59 GMT+08:00