Asondj Fmamj Ja

Figure5.7Monthly means of the energy-balance components in the Chilton Valley (NZ, 35°S). For each month, Rn equals the sum of H, L.E and G.

Figure 5.8 Annual variation of net radiation (Revaporative cooling L.E and convection H, at four places, (a) Pacific ocean at 0°S, 150°E, just off New Guinea; (b) Manaus, Brazil, at 3°S; (c) Mocamedes, Angola, at 15°S; (d) Atlantic ocean at 20°S, 10°E.

recently irrigated wheatfield near Canberra in spring. The latent-heat flux exceeded the radiation energy for much of the daytime, and a substantial amount of heat flowed into the ground, so H was negative, indicating air much warmer than the ground, especially from 10 a.m. till noon. (d) Another example of varying energy balances is in Figure 5.10, relating the monthly rainfall to the monthly mean daily-maximum temperature at Alice Springs, in January, in different years. The temperature is lower in wet months because of the cloud and the heat used in evaporating the rain.

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