Surface Level Solar Ultraviolet-B Radiation At Penang

Broadband photometric measurements of solar UV-B, UV -A, global and diffuse radiation were made at Universiti Sains Malaysia (USM), Penang from 1994 to 2001. Results from this study show that the large temporal variations for the measured solar radiation is due to the dominant effect of solar zen...

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Main Author:	Karuppusamy, Arunasala Pandy Ail
Format:	Thesis
Language:	English
Published:	2006
Subjects:	QC1 Physics (General)
Online Access:	http://eprints.usm.my/55454/1/00001651776.pdf
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id	my-usm-ep.55454
record_format	uketd_dc
spelling	my-usm-ep.554542022-10-31T07:33:23Z Surface Level Solar Ultraviolet-B Radiation At Penang 2006-06 Karuppusamy, Arunasala Pandy Ail QC1 Physics (General) Broadband photometric measurements of solar UV-B, UV -A, global and diffuse radiation were made at Universiti Sains Malaysia (USM), Penang from 1994 to 2001. Results from this study show that the large temporal variations for the measured solar radiation is due to the dominant effect of solar zenith angle and clouds. Under all sky conditions, the mean daily total radiation values for the UV-B, UV-A and global radiation were 1.514 x 104 J m-2, 4.69 x lOS J m-2 and 1.80 x 107 J m-2 respectively. For cloudless sky days, the daily maximum UV-B and global irradiance were 1.372 W m-2 and 1.423 kW m-2. The measured effective UV-B irradiance was converted to the erythemal UV flux to relate it to the potential harmful effects due to UV exposure; UVB flux level is in the High or Extreme ranges between 1030 and 1530 hours local time. A study of the diurnal variation of the solar UV -B, UV-A and global radiation show that for similar zenith angles, the solar irradiance after solar noon is larger than that before solar noon. This assymmetrical effect is attributed to the scattering of solar radiation by clouds. Seasonal variation studies show a constant periodicity for the solar UV-B, UV-A and global flux with maximums in March and September. Using available meteorological parameters and total column ozone data, their effects on the surface level solar UV -B radiation was investigated. A mathematical model to estimate the surface level solar UV-8 radiation was also developed and compared with two established model. The spectral model performance is good with a mean error of9.9%. To compliment the spectral model, a simple empirical model was also formulated using multivariate analysis. The mean error of the empirical model was 2.5%. 2006-06 Thesis http://eprints.usm.my/55454/ http://eprints.usm.my/55454/1/00001651776.pdf application/pdf en public phd doctoral Perpustakaan Hamzah Sendut Pusat Pengajian Sains Fizik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QC1 Physics (General)
spellingShingle	QC1 Physics (General) Karuppusamy, Arunasala Pandy Ail Surface Level Solar Ultraviolet-B Radiation At Penang
description	Broadband photometric measurements of solar UV-B, UV -A, global and diffuse radiation were made at Universiti Sains Malaysia (USM), Penang from 1994 to 2001. Results from this study show that the large temporal variations for the measured solar radiation is due to the dominant effect of solar zenith angle and clouds. Under all sky conditions, the mean daily total radiation values for the UV-B, UV-A and global radiation were 1.514 x 104 J m-2, 4.69 x lOS J m-2 and 1.80 x 107 J m-2 respectively. For cloudless sky days, the daily maximum UV-B and global irradiance were 1.372 W m-2 and 1.423 kW m-2. The measured effective UV-B irradiance was converted to the erythemal UV flux to relate it to the potential harmful effects due to UV exposure; UVB flux level is in the High or Extreme ranges between 1030 and 1530 hours local time. A study of the diurnal variation of the solar UV -B, UV-A and global radiation show that for similar zenith angles, the solar irradiance after solar noon is larger than that before solar noon. This assymmetrical effect is attributed to the scattering of solar radiation by clouds. Seasonal variation studies show a constant periodicity for the solar UV-B, UV-A and global flux with maximums in March and September. Using available meteorological parameters and total column ozone data, their effects on the surface level solar UV -B radiation was investigated. A mathematical model to estimate the surface level solar UV-8 radiation was also developed and compared with two established model. The spectral model performance is good with a mean error of9.9%. To compliment the spectral model, a simple empirical model was also formulated using multivariate analysis. The mean error of the empirical model was 2.5%.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Karuppusamy, Arunasala Pandy Ail
author_facet	Karuppusamy, Arunasala Pandy Ail
author_sort	Karuppusamy, Arunasala Pandy Ail
title	Surface Level Solar Ultraviolet-B Radiation At Penang
title_short	Surface Level Solar Ultraviolet-B Radiation At Penang
title_full	Surface Level Solar Ultraviolet-B Radiation At Penang
title_fullStr	Surface Level Solar Ultraviolet-B Radiation At Penang
title_full_unstemmed	Surface Level Solar Ultraviolet-B Radiation At Penang
title_sort	surface level solar ultraviolet-b radiation at penang
granting_institution	Perpustakaan Hamzah Sendut
granting_department	Pusat Pengajian Sains Fizik
publishDate	2006
url	http://eprints.usm.my/55454/1/00001651776.pdf
_version_	1776101087053348864

Surface Level Solar Ultraviolet-B Radiation At Penang

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