Thickness line
From Glossary of Meteorology
thickness line
(
Also called relative contour, relative isohypse.) A line drawn through all geographic points at which the thickness of a given atmospheric layer is the same; an isopleth of thickness.
Also called relative contour, relative isohypse.) A line drawn through all geographic points at which the thickness of a given atmospheric layer is the same; an isopleth of thickness.
The pattern of thickness lines constitutes a thickness chart.