β Scribed by Louis Berkofsky
No coin nor oath required. For personal study only.
One of the suggestions for modifying weather in semi-arid zones is to alter the albedo over large geographical areas. Work on exploration of this suggestion has been going on for a number of years. Most of the effort along these lines has been to use numerical models, in which it is possible to alter the albedo. One of the questions asked is: What is the minimum size area over which the albedo should be altered to create a noticeable effect in the desert atmospheric flow? In this review, we show, by means of numerical experimentation, using Negev data, that the minimum size desert area which should be affected is 250 km.
Experiments to enhance rainfall by cloud seeding in Israel have been carried out for about 26 years. Most of the experimentation has been taking place in the northern part of the country. There are two methods for seeding--%tatic', in which seeding causes changes in the cloud's microphysics, and "dynamic", in which seeding causes changes in the cloud's dynamics. Results of both types of experiments in Israel are discussed.
Experiments are now under way to apply these techniques to desert clouds.
π SIMILAR VOLUMES
## ABSTRACT In this paper, the role of subsurface drainage in irrigated agriculture in semiβarid and arid regions is discussed based on experiences obtained in Egypt, India and Pakistan. Agriculture in these countries is predominantly practiced by small, marginal farmers with landholdings of often