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Title: Evaporation in relation to CO2 concentration: Analysis of mass transfer coefficient
Authors: Ojha, C. S. P.
Yasuda H.
Rao S.
Abd Elbasit M.A.M.
Kumar M.
Published in: Atmospheric Environment
Abstract: 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. © 2011 Elsevier Ltd.
Citation: Atmospheric Environment(2011), 45(35): 6291-6298
Issue Date: 2011
Keywords: Carbon-di-oxide concentration
Mass transfer
Relative humidity
Vapour pressure
ISSN: 13522310
Author Scopus IDs: 7004206177
Author Affiliations: Ojha, C.S.P., Department of Civil Engineering, Indian Institute of Technology, Roorkee, India
Yasuda, H., Arid Land Research Center, Tottori University, Japan
Rao, S., USEPA, Kansas, United States
Abd Elbasit, M.A.M., Arid Land Research Center, Tottori University, Japan, Desertification Research Institute, National Center for Research, Khartoum, Sudan
Kumar, M., Department of Civil Engineering, Indian Institute of Technology, Roorkee, India
Funding Details: The experiment of the work was funded from the Japan Society for the Promotion of Science (JSPS) through a fellowship to the first author in 2010–11. First author would like to acknowledge the JSPS for the same.
Corresponding Author: Kumar, M.; Department of Civil Engineering, Indian Institute of Technology, Roorkee, India; email:
Appears in Collections:Journal Publications [CE]

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