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A NOTE ON THE UNCERTAINTY IN ESTIMATES OF TRANSFORMITIES BASED ON GLOBAL WATER BUDGETS
Citation:
Campbell, D E. A NOTE ON THE UNCERTAINTY IN ESTIMATES OF TRANSFORMITIES BASED ON GLOBAL WATER BUDGETS. The Proceedings of 2nd Biennial Conference on Emergy Evaluation and Research, Gainsville, FL, September 20-22, 2001.
Description:
The chemical potential energy in rainfall is often the largest renewable emergy input to a given land area. An average of five determinations of the transformity of rainfall using global water budgets showed that 95% of the values may be expected to fall within 11.6% of the mean value of 18,100 sej J?1. The transformity of water evapotranspired, calculated from four estimates, was 28,100 sej J?1 with 95% of the determinations predicted to fall within 16.5% of the mean value. The transformity of the chemical potential energy in rivers calculated from five estimates was 50,100 sej J?1 with 95% of the values expected to fall within 6.8% of the mean. Based on these data the precision with which global water budgets have been determined allows the transformity of global water flows to be known within a standard deviation of 5.9? 2.5 % of their mean values.