Express ozone abundance Total column ozone is the total amount of ozone integrated from the surface to the top of the atmosphere Dobson Units(DU is used to express the total column ozone, named after G.M.B. dobson. a scientist who conducted pioneering measurements of the stratosphere in the 1920s and 1930s One du is the thickness measured in units of hundredths of a millimeter(0.01 mm), that the ozone column would occupy at standard temperature and pressure(273 K and 1 atmExpress ozone abundance • Total column ozone is the total amount of ozone integrated from the surface to the top of the atmosphere. • Dobson Units (DU) is used to express the total column ozone, named after G.M.B. Dobson, a scientist who conducted pioneering measurements of the stratosphere in the 1920s and 1930s. • One DU is the thickness, measured in units of hundredths of a millimeter (0.01 mm), that the ozone column would occupy at standard temperature and pressure (273 K and 1 atm)