Entropy Flows in the EAS

Let us look at the simplified scheme ofthe energy flows in the EAS shown in Figure 1 (see Energy Flows in the Biosphere).

Space q(SG)

Figure 1 Energy flows in the EAS. SWR is the flow of short-wave radiation with TS = 5800 K, LWR is the flow of long-wave radiation with the temperatures of the Earth's surface (ground), TG = 288 K, or the atmosphere TE = 253 K; EVT is the flow of latent heat (evapotranspiration), and Turb + Frict is the flow of turbulent heat (sensible flow) + the flow of heat discharged in mechanical movements (friction).

Figure 1 Energy flows in the EAS. SWR is the flow of short-wave radiation with TS = 5800 K, LWR is the flow of long-wave radiation with the temperatures of the Earth's surface (ground), TG = 288 K, or the atmosphere TE = 253 K; EVT is the flow of latent heat (evapotranspiration), and Turb + Frict is the flow of turbulent heat (sensible flow) + the flow of heat discharged in mechanical movements (friction).

Using Figure 1 we can write equations of entropic balance for the EAS (atmosphere + ground) in a more detailed way:

d-G_4 q(SG) qi(GA) ^(GA) 4 q(GS) di-o ~dT = 3 ~ TG 3 Tg + ~dT

--a = 4 q(SA) qi(GA) q2(GA) 4 q(AS) d,-A dt 3 Ts To To 3 Te dt

It is interesting that the exchange entropic flows, de-o/dt« — 0.586 WK" m— for the ground and de-A/dt0.576 WK— m— for the atmosphere, are almost equal, and their sum is equal to de-/dt— —1.16 W K—1 m—2, that almost coincides with the value given by eqn [2]. In accordance with Prigogine's theorem,

dt dt dt dt

Solar Power

Solar Power

Start Saving On Your Electricity Bills Using The Power of the Sun And Other Natural Resources!

Get My Free Ebook


Post a comment