Water source heat pumps for rain.

Water source heat pumps with large moving bodies of water are very efficient – even more so than air and ground source heat pumps.
Idea: 1) Build a huge tank or tanks of air above the sea on steel frames. 2) Use water source heat pumps and solar energy to warm the air in the tanks. 3) Spray water into the tanks to evaporate in the warm air.
http://www.thegreenage.co.uk/tech/water-source-heat-pumps/ describes these heat pumps..
If a big tank of air is situated in the region near a desert and this air is heated using a water source heat pump and solar energy that is reflected by mirrors onto the tank, seawater can be sprayed into the warm air and evaporated by the hot air. The moisture levels and heat levels of the air could be controlled and the air can be manufactured and released when there is a sea breeze (breeze onto land). The warm moist air will rise by convection to form rain.
The heat exchange of the water source heat pump could take place in the warm Arabian Gulf waters, or in the warm Red sea, making the system very efficient.
With regard to the mirrors focusing solar energy onto the tank with air in, a square kilometre of land or sea surface can often provide about 5 000 000 kWh of energy in a day (5 kWh per square metre per day ). This energy could be focused by the mirrors onto the tank described, or onto a number of tanks. Now 1 kWh can evaporate about 1.6 litres (1.6 kg) of water, so this is enough to evaporate about 5 000 000x1.6 = 8 000 000 litres ( 8000 metric tons) of water. This extra 8000 tons of vapour will increase humidity in the general surroundings and moist air could be targeted to various ares to some extent, by controlling temperature (different rate of rising with different temperatures) and calculating sea breeze direction and velocities. At a relative humidity of 40% and a temperature of 30 deg C 1 cubic kilometre of air holds 12140 metric tons of water vapour. At the same temperature and an RH of 66% this cubic kilometre holds 20032 metric tons (about 8000 tonnes more).