Measurement of cloud angle for enhanced UVB at the Earth's surface

Sabburg, Jeff and Wong, Joe (1999) Measurement of cloud angle for enhanced UVB at the Earth's surface. In: 2nd Internet Conference on Photochemistry and Photobiology: Protection Against the Hazards of UVR 1999, 18 Jan-5 Feb 1999.

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Abstract

This paper presents the results of a four-month study quantifying the effect of cloud and haze on enhanced UVB radiation (310 to 280nm) using a ground based sky camera system. The sky camera system is the first to measure cloud and haze properties near the sun, in contrast to whole sky assessment. images and radiation data were recorded every 6 minutes at Toowoomba, Australia (27.6° S). An image-processing algorithm estimated the amount and brightness of cloud and haze in an angular region of between 12.5 and 35 ° around the sun, as well as the amount of solar obstruction (sun not covered, partially or totally covered). It was found that UVB enhancement greater than 20 % occurred when maximum cloud area was at a 35° angle from the sun.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 14 Nov 2013 00:01
Last Modified: 15 May 2017 05:51
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
04 Earth Sciences > 0401 Atmospheric Sciences > 040106 Cloud Physics
Socio-Economic Objective: D Environment > 96 Environment > 9602 Atmosphere and Weather > 960203 Weather
URI: http://eprints.usq.edu.au/id/eprint/24258

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