Cloud effects on evaporation at a sub-tropical site

Young, A. R. and Sabburg, J. (2006) Cloud effects on evaporation at a sub-tropical site. In: Australian Institute of Physics (AIP) 17th National Congress 2006, 3-8 Dec 2006, Brisbane, Australia.

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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.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Depositing User: Bulkimport bulkimport
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 30 Nov 2007 11:55
Last Modified: 03 Jul 2013 00:15
Uncontrolled Keywords: ceilometer, pyranometer; evaporation; evapotranspiration
Fields of Research (FOR2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040107 Meteorology
04 Earth Sciences > 0401 Atmospheric Sciences > 040102 Atmospheric Dynamics
04 Earth Sciences > 0401 Atmospheric Sciences > 040106 Cloud Physics
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9602 Atmosphere and Weather > 960299 Atmosphere and Weather not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/12061

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