Guys, the hub height on most serious offshore turbines is 70-80m with an 80m diameter. That means the wake is 30m-40m in the air. (ie higher than your kite)
SSK I'm not sure what you are trying to show with the contrails.
given the right conditions a pressure differential will result in condensation. Wind turbines obtain their drive by using a foil to produce a pressure differential to drive their rotation. In extreme humidity their bound to produce condensation. With falling pressure or temperature, the condensation would not have sufficient energy to overcome the latent heat of vaporization and would not be reabsorbed for quite some time (if at all)
The photo does not indicate large scale turbulence or pressure disruption outside of the immediate wind farm area just a bunch of selective air particals made visible and then mixed around by rotating blades. Take a bunch of smoke machines and spin em around in circles in front of a few low speed fans and the visual effect would be somewhat similar.
A conclusive photo would be to show differences in smoke steams and wind speeds 1km in front and 1 km behind the wind farm or 6 MILES behind in the case of this post between 2 and 25m off the water surface.
most of the studies you quoted indicate that generally the wake effects are cleared up after 10-15 rotor diameters. (800m) and yes large scale wind farms 8 x 10 arrays of 80m diameter rotors can take 5-20km for wind to recover to 2% of their upstream velocities.
[please take a moment to consider the MASSIVE scale of these wind farms]
However, IF someone has invested in a LARGE scale off shore wind farm you can bet your balls, it's in a location that's F'N WINDY. So 2% isn't even worth mentioning, you're STILL riding your 6m.....
I'm not pro or anti wind farm,I don't believe they are the solution but am aware we need all the help we can get. In the mean time fire up some more nuclear reactors so we can all plug in our electric cars at night and get 200 mpg driving to our favourite kite spot.......