Cloud effects on evaporation at a sub-tropical site

Paper


Young, A. R. and Sabburg, J.. 2006. "Cloud effects on evaporation at a sub-tropical site." Sang, Robert and Dobson, John (ed.) Australian Institute of Physics (AIP) 17th National Congress 2006. Brisbane, Australia 03 - 08 Dec 2006 Brisbane, Australia.
Paper/Presentation Title

Cloud effects on evaporation at a sub-tropical site

Presentation TypePaper
AuthorsYoung, A. R. (Author) and Sabburg, J. (Author)
EditorsSang, Robert and Dobson, John
Journal or Proceedings TitleAustralian Institute of Physics (AIP)17th National Congress 2006: Referreed Papers
Number of Pages4
Year2006
Place of PublicationBrisbane, Australia
ISBN0959806474
Web Address (URL) of Paperhttp://www.aip.org.au/Congress2006/552.pdf
Conference/EventAustralian Institute of Physics (AIP) 17th National Congress 2006
Event Details
Australian Institute of Physics (AIP) 17th National Congress 2006
Event Date
03 to end of 08 Dec 2006
Event Location
Brisbane, Australia
Abstract

Water usage impacts the management of our water resources. It is believed that accurate information on the
hydrological cycle disseminated to the public, will considerably alter consumer usage behaviour.
Evapotranspiration is one of the most variable and sensitive of the hydrological components and it is imperative that we fully understand what environmental factors directly or indirectly affect evapotranspiration. The objective of this study was to confirm the indirect affect of clouds on evaporation by examining how clouds affect variables used by the Penman-Monteith equation. As expected, during the day or night it was found that clouds had a negative correlation with solar radiation and temperature, and a positive correlation with humidity all at the earth's surface. There was no significant relationship between wind speed and clouds except during the night. Correlation coefficients, with respect to cloud, for temperature and humidity varied only slightly from day to night, but interestingly wind speed showed a significant change from 0.077 to 0.264. These findings may suggest that there are some occasions when 'water-wise' activities, for example watering the garden at night to decrease potential
evaporation, may not be as beneficial as previously thought.

Keywordsceilometer, pyranometer; evaporation; evapotranspiration
ANZSRC Field of Research 2020370108. Meteorology
370105. Atmospheric dynamics
370107. Cloud physics
Byline AffiliationsDepartment of Biological and Physical Sciences
Institution of OriginUniversity of Southern Queensland
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