myjewishlearning.com |
June 2009 was the driest June of this century. The rainfall deficiency in the month of July was also 12 percent higher than that predicted by the Meteorological Department. Union Agriculture Minister Sharad Pawar also acknowledged that a large part of the country is facing a drought-like situation which includes the northwestern part of the country, which is the food base. In hot countries like India, Indonesia, Malaysia, even 5 percent less rain than normal creates drought conditions.
Facilities here and rainfed farming are responsible for this. About 50 countries have been using the cloud-seeding method for the last half-century. China is the leader in this work, where it is done in 90 percent of the provinces. The first demonstration of cloud-seeding was performed by the General Electric Lab in February 1947 in Bathurst, Australia. Clouds are actually made up of water droplets or ice particles. The moist air near the surface of the earth rises due to the heat of the sun or the air vents. When the air rises, its pressure decreases and it cools down. These two effects are responsible for condensing water to form droplets.
Rain or snow is that small part of the moisture of the clouds that reaches the surface of the Earth. Can clouds be induced to rain more water? Scientists were wondering how to increase rainfall through cloud-seeding. In this process, the air is actually dispersed into something that acts as a nucleus for the ice.
Silver iodide or dry ice (solid carbon dioxide) for cloud-seeding is dispersed into the atmosphere via a generator or plane. Silver iodide is dispersed from the plane with the flow of clouds.
The structure of silver iodide crystals is similar to that of natural ice. How silver iodide causes water and ice to accumulate on the surface of crystals Artificial rains Praveen Kumar: Cloud-seeding has been used in various countries for more than 50 years to change the weather accordingly.
It was used during the Beijing Olympics in August 2008. It is said that the threat of rain which was hovering over the Olympic inauguration ceremony by cloud-planting was successfully avoided. The particles are formed as if they were natural ice.
The help of aircraft is taken to perform cloud-seeding through the air. The aircraft consists of two silver iodide burners or generators in which a silver iodide solution is filled at high pressure. In the target area, the aircraft is driven in the reverse direction of the wind. The burners are turned on as soon as they encounter the right cloud. The flight is decided by cloud-seeding officials based on weather data. The flight is decided by the cloud-seeding authorities based on weather data. Dry ice cools the water by 0 ° C, which freezes the water particles in the air. Does cloud-seeding really increase rain? The World Meteorological Organization believes that it does not give successful results every time and it depends on the type of cloud, the speed, and direction of the wind and the nature of the terrain, etc. Cloud-seeding works only when there are suitable clouds. In the past, through this method, climate change was attempted during drought. But during the drought, the clouds are very less. It would be better to use cloud-seeding in rainy years to provide for future needs.
Clouds suitable for cloud-seeding are mainly cumuliform and stratiform clouds. Cumuliform clouds are clear outward shaped clouds in the shape of a dome or tower. They have a lot of convection currents and a lot of mixing up and down. Stratiform clouds are flaky and have low convection currents. For cloud-seeding, there should be a sufficient amount of super-cooled liquid water in the cloud. Clouds are deep enough and their temperature is within a certain range. Cloudy ice particles get larger by joining other cloud particles. Finally, when these snow particles come down after raining, they fall as water droplets or as snow according to the temperature.
The help of aircraft is taken to perform cloud-seeding through the air. The aircraft consists of two silver iodide burners or generators in which a silver iodide solution is filled at high pressure. In the target area, the aircraft is driven in the reverse direction of the wind. The burners are turned on as soon as they encounter the right cloud. The flight is decided by cloud-seeding officials based on weather data. The flight is decided by cloud-seeding officials based on weather data. Cloud-seeding has not resulted in an increase in rainfall outside the target area. In winter, there are not enough ice particles in the clouds and the water droplets in liquid form evaporate. On August 12, 2008, during the 29th Olympic opening ceremony in Beijing, China used cloud-seeding missiles at 21 places to avoid the threat of rain. As a result, the rain was averted and fireworks during the festival survived. China's meteorological office rarely publishes its results, so their claims of success are in doubt. Cloud-seeding is also used to reduce haze and clouds in airports. In well-designed and conducted experiments, an increase of 5 to 20 percent in winter and 5 to 30 percent in coastal terrain is considered acceptable in the interior area. Experiments on a cloud for summer rain have seen an increase of up to 100 percent.
In most cloud-seeding projects the benefit-cost ratio is 25: 1 to 30: 1. Overall, artificial rainfall is still not a completely reliable technology of its own accord. But the water required for every biochemical activity has become a rare substance on the earth. Therefore the scientific study is bound to happen in this regard. Roelof Brurantjes of the US National Center for Atmospheric Research, in his article in the Bulletin of the Meteorological Society, states that there are some fundamental questions that still remain unanswered in order to provide a strong scientific foundation to this technology. Can cloud-seeding relieve global warming? This proposal by John Latham of the Center for Atmospheric Research, University of Manchester is attracting the attention of the scientific community.
It is also mentioned in two research papers published in the Philosophical Transactions of the Royal Society. Latham has also proposed cloud-seeding sea clouds with fine droplets of salt water to speed up the natural process of cloud formation. This may enable them to reflect more sunlight into the sky. Based on the calculations of global environmental models, it is being said that cloud-seeding is behind global warming by 50 to 100 years.
0 Comments
Please do not enter any spam link in the comment box.