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Khatri, P., T. Takamura, A. Yamazaki, and A. Uchiyama, 2014: Use of 315nm channel data of the sky radiometer to estimate the columnar ozone concentration: A preliminary study. J. Meteor. Soc. Japan, 92A, 185-194.
https://doi.org/10.2151/jmsj.2014-A12

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Highlights:

• A method and preliminary results related to the estimation of the columnar ozone concentration (U) using the 315nm channel data of the sky radiometer are presented. The proposed method consists in calculating the calibration constant for direct intensity at 315nm wavelength F₀ (315nm) using in situ observation data, which is an alternative of the traditional Langley method, and then estimating U.
• The temporal values of U at Chiba, Japan for the period of January - April, 2013 were estimated, and they were compared with values observed by the ozone monitoring instrument (OMI). The agreement was satisfactory during the initial period of observation; however, the values from the sky radiometer were observed to be gradually overestimated with time.
• The study suggests that the temporal change of F₀ (315nm) is the important factor to be considered while estimating U values for long-term observation and that F₀ (315nm) must be determined periodically.