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Proceedings Paper

Long-term evaluation of UV-B irradiance in middle-latitude Japan in the 1990s
Author(s): Masako Sasaki; Shu Takeshita; Takehiko Oyanagi; Yukiharu Miyake; Toshibumi Sakata
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Paper Abstract

Ground-based global solar ultraviolet-B (UVB) irradiance has been measured by a narrowband-spectral UVB radiometer at Tokai University, Hiratsuka (35 degree(s)21' N, 139 degree(s)16' E) Japan for a 10-year period from October 1990 to September 2000. A precise calibration of the UVB radiometer was periodically performed and the yearly decay sensitivity was found to be -3.7% of the initial sensitivity. Using this decay rate, the measured UVB irradiance was corrected, and the long-term trends of the UVB irradiance were estimated. An increase in the UVB irradiance was demonstrated to be 1.57% per year with a seasonal variation correction, and 1.22% per year with global total solar irradiance and the seasonal variation corrections in addition to quasi-biennial oscillation (QBO) correction. A significant, negative correlation was confirmed between the UVB irradiance normalized by the total solar irradiance and the effective ozone amount ((total ozone amount) x sec (theta) , where (theta) is the solar zenith angle) at Tsukuba, the closest ozone amount measuring site. These findings can be supportive evidence for a direct relationship between solar UVB irradiance and stratospheric ozone amount.

Paper Details

Date Published: 17 January 2002
PDF: 9 pages
Proc. SPIE 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects, (17 January 2002); doi: 10.1117/12.452920
Show Author Affiliations
Masako Sasaki, Tokai Univ. (Japan)
Shu Takeshita, National Institute of Polar Research (Japan)
Takehiko Oyanagi, Tokai Univ. (Japan)
Yukiharu Miyake, EKO Instruments Trading Co., Ltd. (Japan)
Toshibumi Sakata, Tokai Univ. (Japan)

Published in SPIE Proceedings Vol. 4482:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects
James R. Slusser; Jay R. Herman; Wei Gao, Editor(s)

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