Theoretical and measured evaporation rates from an exposed piche atmograph
✍ Scribed by Kyaw Tha Paw U; Massamba Gueye
- Publisher
- Elsevier Science
- Year
- 1983
- Weight
- 620 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Paw U, K T and Gueye, M, 1983 Theoretmal and measured evaporation rates from an exposed Pmhe atmograph Agrm Meteorol, 30 1--11
The Pmhe atmometer Is still used throughout the world, a century after its mventmn As with most evaporation instruments, the meaning and utlhty of Pmhe readings have been questioned In the present study, a hnearlzed energy budget for a leaf ~s used to predict the daily evaporation from a Piche atmograph This approach showed a one-toone relatmnshlp with observed evaporatmn, and accounted for 70--90% of the observed variance Successful predmtlons were possible even when the meteorologmal data were taken at 12-h intervals, although the most accurate predmtmns were based on data taken at 1-h intervals Sensitivity analysis predicts that Pmhe evaporation is strongly affected by mr temperature, relative humidity, wind speed and long-wave radlatmn, albedo and short-wave radmtmn had lesser effects The present study supports the idea that the Pmhe atmograph models the potentml evapotransplratmn of an ind~wdual leaf * Indiana Agricultural Expemment Station Journal Paper No 9845