By E. Babatunde
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Laulainen N. 2009. Global Dimming and Interannual and Intraseasonal Variations of the Available Solar Radiation 51 Brightening Versus Atmospheric Column Transparency, Europe, 1906-2007. J. Geophys. Res. 1029/2008JD010644 Power H. C. 2001. Estimating clear-sky beam irradiation from sunshine duration. Solar Energy, 71, 4, 217-224 Russak V. 1990. Trends in solar radiation, cloudiness and atmospheric transparency during recent decades in Estonia. , Kallis A. (compilers), Tooming H. (ed). 2003. Handbook of Estonian solar radiation climate.
For example if we focus on 5 March 2011 (see Figure 4), a particularly windy and dry day apparently resulting from a brief Santa Ana event (see Raphael (2003) for a description of this kind of events), we observe that Emod underestimates Eobs, especially during the nighttime early hours. In this situation Emod can only be appropriately modeled if we could include in our algorithm wind and humidity observations, which as mentioned before is not possible. Yet the model clearly indicated that in this case other evaporative causes, besides the ones related to energy fluxes, were also related to R and playing a role in E.
1988). Obviously this assumption is not valid during the nighttime, when E ~ 0 but not nil. Likewise we may consider the sensible heat flux to be approximated by H = -a2 × ΔTa. The Relationship Between Incoming Solar Radiation and Land Surface Energy Fluxes 25 Fig. 2. Comparison between modeled soil evaporation Emod and observed soil evaporation Eobs. 0 m (the height at which Ta is measured), we straightforwardly get raH = -(ρ cp / a2) ~ 265 [m-1 s]. This value is a very good approximation to the one obtained from its simplest theoretical form, i.
Solar Radiation by E. Babatunde