What is Barotropic?
The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere do not intersect each other, that is, the contours and isotherms do not intersect each other.
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The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
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The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.