hybrid sigma pressure

I made the attached plot of the difference in temperature between two CCSM3 simulations.
The x axis is month. The y axis is hybrid sigma pressure coordinates. Temperature is
averaged over the North American monsoon region, so it contains both high and low elevations.

I just would like to verify that I don't need to mask any of the temperatures where the hybrid
sigma pressure is > than the surface pressure (mountainous areas). My understanding
is that the coordinate system is terrain following near the ground so this should be fine.

Mike

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