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1 août 2021
- handle: 10670/1.5ngwv5
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R. Arthur Chapman et al., « Diverse trends in observed pan evaporation in South Africa suggest multiple interacting drivers », South African Journal of Science, ID : 10670/1.5ngwv5
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Résumé
Planning for future water resource management in a warming climate is confounded when an expectation of increasing evaporation from open water surfaces with global warming is contradicted by observations of secular declines of pan evaporation. Decreasing pan evaporation has been observed globally - a trend which has been attributed variously to declines in wind run ('global stilling'), declines in radiation ('global dimming') and increases in ambient humidity. This contrast between expectation and observation is known as the 'evaporation paradox'. We evaluated trends in Symons pan evaporation from 154 pans across South Africa. Whilst 59 pans (38% of the 154) showed a statistically significant decrease in observed evaporation rates (p