| heal.abstract |
This paper presents some measurements of micrometeorological quantities, taken over a lake. The measured quantities include horizontal and vertical components of the wind speed, readings of temperatures from wet and dry-bulb thermocouples, short- and long-wave incoming and outgoing radiation fluxes, readings of water temperatures at three different depths in the lake, as well as readings of the water surface temperature. Direct outcome of the measurements are the sensible (C) and latent (le) heat fluxes as determined by the eddy correlation method. The calculation of the potential or reference evapotranspiration according to various, commonly used methods allows the comparison of the calculated le values with the measured ones. It has been observed that the results obtained from the bulk aerodynamic method are in quite good agreement with the measured eddy correlation ones. The Penman method shows a trend of overestimating potential evapotranspiration while the Bowen ratio and the Monteith-Penman methods give rather satisfactory results only for those cases where the value of the ratio βm βc is close to unity. The concept of the aridity index of the atmosphere and the state of its stability have also been investigated. © 1988. |
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