Uchiyama, A., A. Yamazaki, and R. Kudo, 2014: Column water vapor retrievals from sky radiometer (POM-02) 940 nm data. J. Meteor. Soc. Japan, 92A, 195-203.
- To retrieve the columnar precipitable water vapor amount from sun-sky radiometers, the POM-02 940-nm channel was calibrated using the Langley method, which accounts for gas absorption.
- The relation between column water vapor and atmospheric transmittance at 940 nm was determined using simulation data, and the results were used to retrieve column water vapor.
- This method was applied to data collected at Tsukuba, Japan, in 2011 and compared with global positioning system receiver (GPS).
- A comparison of POM-02 and GPS results showed a bias error of 0.09 g cm–2; the root mean square error was 0.179 g cm–2; and correlation coefficient r = 0.996.