Saturday, February 4, 2017

Rain from temperature differences.

I was reading
which says, "Such a large acceleration arising from only a modest temperature difference illustrates the importance of buoyancy in determining vertical transport in the atmosphere."
I am convinced that having lighter coloured areas round a city with a dark area in the middle one could get air rising fast and possibly get rain to fall when the air cools higher up. Example: The black inner area heats up 3 deg C more than the surrounding lighter coloured surroundings (very feasible) to say 30 deg C (surroundings at 27 deg C). Then this hotter air mass initially accelerates from the ground at about 0.1 m/s^2.
Later on, within a cloud formation, if there is a 3 deg C temperature difference, the hotter air can reach an upward velocity of about 9 m/s relative to the rest of the cloud (using an equation from a cloud physics text). On getting colder this rising air mass will cause more condensation. Could we use some fairly harmless dye to darken areas of the sea so that temperature of the dark area is one or two degrees higher than the surroundings and so cause rain. Could plankton be used to darken an area?
See also 

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