Effects of atmospheric stability conditions on heat fluxes from small water surfaces in (semi-)arid regions
| Autor: | F. O. Annor, Nick van de Giesen, Ali Abbasi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Convective heat transfer Planetary boundary layer 0208 environmental biotechnology Evaporation Eddy covariance 02 engineering and technology Sensible heat small reservoirs Atmospheric sciences 01 natural sciences 020801 environmental engineering evaporation stability condition Atmosphere atmospheric boundary layer Heat flux semi-arid region Atmospheric instability Environmental science Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Hydrological Sciences Journal, 62(9) |
| ISSN: | 0262-6667 |
| Popis: | Atmospheric stability conditions over the water surface can affect the evaporative and convective heat fluxes from the water surface. Atmospheric instability occurred 72.5% of the time and resulted in 44.7 and 89.2% increases in the average and maximum estimated evaporation, respectively, when compared to the neutral condition for a small shallow lake (Binaba) in Ghana. The proposed approach is based on the bulk-aerodynamic transfer method and the Monin-Obukhov similarity theory (MOST) using standard meteorological parameters measured over the surrounding land. For water surface temperature, a crucial parameter in heat flux estimation from water surfaces, an applicable method is proposed. This method was used to compute heat fluxes and compare them with observed heat fluxes. The heat flux model was validated using sensible heat fluxes measured with a 3-D sonic anemometer. The results show that an unstable atmospheric condition has a significant effect in enhancing evaporation alongside the sensible heat flux from water surfaces. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|