TEMPERATURE-DEPENDENCE OF WATER-VAPOR ABSORPTION-COEFFICIENTS FOR CO2 DIFFERENTIAL ABSORPTION LIDARS

A temperature correction of water vapor differential absorption coefficients for the CO2 transition line pairs (10R20, 10R18) and (10R20, 10R22) for temperatures between -0.5 degrees C and 20 degrees C is computed, with a reference temperature of 27 degrees C, from medium-range CO2 lidar field measurements. The empirical temperature correction, X(T), is fitted with the polynomial X(T) = a(0) + a(1) x T + a(2) x T-2. For the transition line pair (10R20, 10R18) the temperature dependence ranges from 1.62%/degrees C to 3.47%/degrees C, and the temperature correction for the transition line pair (10R20, 10R22) ranges from 1.32%/degrees C to 2.43%/degrees C.