Changes to the Surface Level Solar Ultraviolet-B Radiation Due to Haze Perturbation |
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Authors: | Mohammed Ilyas Arunsala Pandy Mohd Suhaimi Jaafar |
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Institution: | (1) Astronomy and Atmospheric Science Research Unit, University of Science Malaysia, 11800 Penang, Malaysia |
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Abstract: | The South-East Asian region experienced a haze episode in 1994 which was widely believed to be due to widespread forest fires in Sumatra and Kalimantan (Indonesia). Broadband measurements of the surface level solar ultraviolet-B, UV-A and Global radiation at Penang (Malaysia) are used to study the effect of the 1994 haze on effective UV-B irradiance. We find that during the haze episode, there is enhanced absorption of surface level UV-B radiation. The effect of haze on UV-A and Global radiation is much less. The reduction in absolute noon time UV-B irradiance (mostly cloud free) during the 1994 haze period was 23% relative to the UV-B irradiance during thecorresponding haze-free period in 1995. Even though the noon time radiation data minimizes the cloud effect in the results presented some cloud effect is still present. |
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Keywords: | haze forest fires radiation ultraviolet ozone |
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