Earth Planets Space, Vol. 59 (No. 8), pp. e37-e40, 2007E-LETTER
Toshimi Nakata1, Kazuyuki Kita1, Makoto Suzuki2, Kei Shiomi3, Shin-ichiro Okumura4, and Toshihiro Ogawa3
1Department of Environmental Sciences, College of Science, Ibaraki University
2Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
3Earth Observation Research Center, Japan Aerospace Exploration Agency (EORC/JAXA)
4Bisei Spaceguard Center, Japan Space Guard Association
(Received May 7, 2007; Revised July 10, 2007; Accepted July 23, 2007; Online published August 31, 2007)
Slant column amounts of ozone were evaluated from the solar
backscattered spectra measured with a simple spectrograph onboard an
aircraft over the Pacific Ocean south of Japan in January 2002.
A least-squares fitting method optimized on the basis of Bayesian
statistics was developed to evaluate them, and the random error in the
fitting was about 2.4%. The evaluated slant column amounts of ozone were
compared with those calculated from the total ozone data measured with
the Total Ozone Mapping Spectrometer (TOMS) on the same day.
The differences between the two ranged from a few percent points to more than 20%, and they increased when a small wavelength deviation in the spectrograph
occurred due to the aircraft vibration.
Excluding the error due to this
wavelength deviation, instrumental and systematic errors were estimated
to be less than 10%, demonstrating that this airborne measurement with
the spectrograph and the developed fitting method could evaluate the ozone
column amount with a good accuracy.
Key words: Remote-sensing, ozone, solar ultraviolet spectrum, retrieval, Bayesian statistics.