Pan Evaporation Trends and the Terrestrial Water Balance. I. Principles and Observations
Pan evaporation is just that - it is the evaporation rate of water from a small dish located at the ground-surface. Pan evaporation is a measure of the evaporative demand over terrestrial surfaces. Declines in pan evaporation have now been reported in many regions of the world. The trends vary from one pan to the next, but when averaged over many pans, they are typically in the range of -1 to -4 mm a-2 (mm per annum per annum). In energetic terms, a trend of -2 mm a-2 is equivalent to -0.16 W...[Show more]
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