Dr. Abdulaziz Rashad Seroji Profile

Dr. Abdulaziz Rashad Seroji

at Umm Al-Qura Univ

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Publications (2)

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Proceedings Article | 18 August 2005 Paper

Average surface albedo measurements in the UV, IR, and TSR on the Holy Mosque and places in Makkah, Saudi Arabia

Abdulaziz Seroji

Proceedings Volume 5886, 58860D (2005) https://doi.org/10.1117/12.619876

KEYWORDS: Ultraviolet radiation, Infrared radiation, Sensors, Clouds, Radiometry, Calibration, Solar radiation, Reflection, Reflectivity, Visible radiation

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Average albedo values were measured at three broad wavebands; UV region (295 - 385 nm), Total Solar Radiation, TSR, (305 - 2800 nm), and IR region (3500 - 50000 nm), over different surfaces in the Holy Mosque and Places in Makkah (21°.25 N, 39°.49 E). The Eppley Laboratory Radiometers of TUVR and PIR were used for UV and IR measurements respectively, while Kipp & Zonen Pyranometer of CM3 was adopted for the TSR observations. Measurements were performed during two different periods (summer 28/7-10/8/2004 at Holy Mosque and winter 18-30/1/2005 at Holy Places). Summer measurements showed that the average surface albedos of the Holy Mosque white marbles were 0.45, 0.70 and 1.14 at UV, TSR and IR regions respectively. These values have decreased to 0.12 and 0.18 at UV and TSR regions respectively over the Holy Mosque brown marbles. However, the average albedo value has increased to 1.38 at IR region due to the large Longwave radiation emission from the brown marble surfaces. The albedo values of the Holy Mosque red carpets were determined. The average albedo values were also measured over the Holy Places surfaces (18 m) of pilgrimage, (Muna and Arafat sites) during winter 2005. The observed average surface albedo values over Arafat selected area were 0.00, 0.22 and 1.18 at UV, TSR and IR regions respectively. The average albedo values over Muna selected area and Muna tents were also presented. The effect of clouds and solar zenith angle (SZA) on the measured albedo were investigated in this study.

Proceedings Article | 1 July 2003 Paper

Deriving actinic flux and photolysis rates from spectral and multiband measurements of UV irradiance

Ann Webb, Richard Kift, Abdulaziz Seroji

Proceedings Volume 4896, (2003) https://doi.org/10.1117/12.466123

KEYWORDS: Photolysis, Ultraviolet radiation, Radiometry, Data conversion, Clouds, Quantum efficiency, Absorption, Ozone, Head, Calibration

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Actinic flux (the radiation incident on the surface of a small sphere) is the measure of radiation required for atmospheric chemistry. The photolysis rate for a given species is the product of its absorption cross-section, quantum yield and the actinic flux, integrated over all relevant wavelengths. Despite their importance, actinic flux and photolysis rate data are not routinely available since radiation monitoring sites usually report irradiances (radiation on a flat, horizontal surface). Using data from Reading (UK) we show that spectral UV actinic fluxes can be derived from spectral irradiance measurements with a scanning spectroradiometer (Bentham DTM300) to within an uncertainty of 20% full range, or 15% if sky conditions are known. Any photolysis rate dependent on these wavelengths can then be calculated from the actinic flux data. The disadvantage of spectroradiometers is their scan time of several minutes. The GUV-541 multi-band radiometer measures across 5 narrow UV channels simultaneously and samples at a rate of 2-3Hz. Using a semi-empirical formula, this multi-band irradiance data can be converted into photolysis rates for J(O₃) and J(NO₂). The GUV derived photolysis rates were within 20% of those calculated from spectral actinic fluxes under all conditions tested. This compares well with other methods of measuring photolysis rates.

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