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 atm
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 atm)
Typical ozone column values Total ozone column value ranges from 290 to 310 DU over the globe. If all the atmosphere' s ozone were brought down to the earth's surface at standard pressure and temperature, it would produce a layer of about 3mm thick Ozone depletion: when sum of ozone over height is lower than 2/3 of the normal value we say"ozone depletion " occurs
Typical ozone column values • Total ozone column value ranges from 290 to 310 DU over the globe. • If all the atmosphere's ozone were brought down to the earth's surface at standard pressure and temperature, it would produce a layer of about 3mm thick. • Ozone depletion: when sum of ozone over height is lower than 2/3 of the normal value, we say "ozone depletion" occurs