Solar ultraviolet irradiance and its temporal variation |
| |
| Institution: | 1. School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou 510275, China;2. School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China;3. Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China;4. Institut für Geologie und Paläontologie, Westfälische Wilhelms-Universität Münster, Münster 48149, Germany;5. South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Guangzhou 510006, China;6. Guangzhou Marine Geological Survey, Guangzhou 510760, China;7. Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;8. Institut für Geologie, Universität Hamburg, Hamburg 20146, Germany;9. Department für Geodynamik und Sedimentologie, Universität Wien, 1090, Wien, Austria;1. Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310 Allée des Ursulines, Rimouski, QC G5L 3A1, Canada;2. Université du Québec à Rimouski, 300 Allée des Ursulines, Rimouski, QC G5L 3A1, Canada;3. Département de Chimie, Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Université Laval, Québec, QC G1V 0A6, Canada;4. Geotop and Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke St. West, Montréal, Québec H4B 1R6, Canada |
| |
| Abstract: | Solar radiation at wavelengths below 300 nm is almost completely absorbed by the Earth’s atmosphere, becoming the dominant direct energy source and playing a major role in the chemistry and dynamics. Even small changes in this incoming radiation field will have both direct and indirect influences on atmospheric processes, and perhaps will affect the Earth’s climate as well. Some of the very earliest space missions included devices to measure solar ultraviolet irradiance, but for the most part they lacked the necessary precision and accuracy to record true solar variability over long time periods. The technology has continued to improve, and today reliable measurements over time scales up to, and including, the 11-year solar cycle, are being obtained. This review provides a summary of measurements made during the most recent solar cycle (number 22 extending from 1986 1996), with emphasis on the spectral range 120-300 nm. Comparisons and validations of recent data sets are considered, together with an assessment of the present understanding of the solar variations. There is now general agreement that for solar cycle 22 the variation is as large as a factor of two at the shortest wavelengths, decreasing to roughly 10% near 200 nm. Proceeding to wavelengths above 200 nm the solar variability continues to decrease, and at about 300 nm it becomes smaller than the present measurement capability of about 1%. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
