| a) atmospheric ozone content
(Unit: cm of column height)
volume of ozone at standard temperature and pressure in a vertical column of the atmosphere 1 cm2 in cross section
b) precipitable water vapour content
(Unit: cm of column height)
volume of precipitable water vapour in a vertical column of the atmosphere 1 cm2 in cross section
c) atmospheric transmissivity
(Unit: dimensionless, usually expressed as a percentage, %)
ratio of the transmission light intensity against the incident light intensity when measured with the unit length of the perpendicular column of the atmosphere |