Most of the turbulence is near the ground. A discrete layer fit to the profile was made by fitting 1-d guassians to the profile. The following table gives the relative strength of the layers and the wind velocities. The brightness of a sodium laser guide star depends linearly on the sodium column density above the sites. The seasonal variations appear to be similiar in that they peak in the respective winter months.
Sporadic layers appear and move on timescales as short as minutes.
Below are listed a few of the studies which have been done at or near the two Gemini Telescope sites. Feel free to send us more references to add to this list. Observatory Mauna Kea Lidar Papen et al. Lidar Simonich et al. Lidar Clemesha et al.