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Red 84: === Maksimum potencijalnog intenziteta === ~~Due~~Usled topovršinskog ~~surface friction~~trenaja, ~~the~~priliv ~~inflow~~samo ~~only~~parcijalno ~~partially~~očuvava ~~conserves~~ugaoni ~~angular momentum~~momenat. Thus, the sea surface lower boundary acts as both a source (evaporation) and sink (friction) of energy for the system. This fact leads to the existence of a theoretical upper bound on the strongest wind speed that a tropical cyclone can attain. Because evaporation increases linearly with wind speed (just as climbing out of a pool feels much colder on a windy day), there is a positive feedback on energy input into the system known as the Wind-Induced Surface Heat Exchange (WISHE) feedback.<ref name="JAS Emanuel 1986" /> This feedback is offset when frictional dissipation, which increases with the cube of the wind speed, becomes sufficiently large. This upper bound is called the "maximum potential intensity", <math>v_p</math>, and is given by Red 92: The maximum potential intensity is predominantly a function of the background environment alone (i.e. without a tropical cyclone), and thus this quantity can be used to determine which regions on Earth can support tropical cyclones of a given intensity, and how these regions may evolve in time.<ref name="Emanuel_2000_MWR">{{cite doi \| 10.1175/1520-0493(2000)128<1139:ASAOTC>2.0.CO;2}}</ref><ref name="Knutson_etal_2010_NG">{{cite doi \|10.1038/ngeo779}}</ref> Specifically, the maximum potential intensity has three components, but its [[Tropical cyclone#Characteristic values and variability on Earth\|variability in space and time]] is due predominantly to the variability in the surface-air enthalpy difference component <math>\Delta k</math>. == tmp == ==== Derivacija ==== A tropical cyclone may be viewed as a [[heat engine]] that converts input [[heat]] energy from the surface into [[mechanical energy]] that can be used to do [[mechanical work]] against surface friction. At equilibrium, the rate of net energy production in the system must equal the rate of energy loss due to frictional dissipation at the surface, i.e.

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