Quantitative approach A second approach is more quantitative and has been used in standard modelling practice in the UK for some years. It takes into account a variety of factors, including the wind speed, the roughness of the ground surface, and the extent to which heat is gained or lost by the layer of air at the surface – we call this the sensible heat flux . Information on the vertical sensible heat flux can be obtained by knowing the extent of cloud cover, the time of day and the time of year, and then using Figure 17. This gives an estimate of the incoming solar radiation (ISR), S , that is typical of the UK.
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