Evaporation in relation to CO₂ concentration: Analysis of mass transfer coefficient
2011
Ojha, C.S.P. | Yasuda, Hiroshi | Rao, Surampalli | Abd Elbasit, Mohamed A.M. | Kumar, Manoj
In this study, the potential of mass transfer approach in estimating evaporation changes under different CO₂ levels are evaluated using data from controlled chamber experiments in which radiation and wind velocity were kept constant and temperature and relative humidity profiles were varied in different patterns along with CO₂ concentration. Currently, FAO procedure lists three approaches to compute air vapour pressure based on temperature and relative humidity profiles. In this study, the impact of using different procedures of estimating air vapour pressure is examined to assess the use of mass transfer approach for estimating evaporation. To achieve this, a part of the data is used to calibrate mass transfer coefficient which is subsequently used to project evaporation for future states. Accordingly, strategies are ranked for their potential in estimating evaporation. The effect of evaporation rate is compared at 400 ppm and 600 ppm CO₂ level. It has been observed that the evaporation rate is more pronounced at higher CO₂ level.
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