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The optical turbulence conditions as measured between 2004 until end of 2008above Cerro Tololo, their seasonal as well as nocturnal behavior are presented.A comparison with the MASS-DIMM system of the Thirty Meter Telescope sitetesting was conducted and identifies an artificially increased seeing componentin the data collected by the CTIO DIMM system under northerly winds. Evidenceis shown that this increased turbulence is caused by the telescope dome. Acorrection for this effect is attempted and applied to the CTIO DIMM data. TheMASS data of this comparison campaign allow to set constraints on the generalassumption of uniform turbulent layers above a site.

Four years of optical turbulence monitoring at the Cerro Tololo Inter-American Observatory (CTIO)