Variability,Uncertainty, and Sensitivity of Phosphorus Deposition Load Estimates in South Florida |
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Authors: | Ahn Hosung James R Thomas |
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Institution: | 1. Water Resources Planning Department, USA 2. Watershed Research and Planning Department, South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, Florida, 33406, U.S.A
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Abstract: | Atmospheric deposition, a substantial source of phosphorus (P) to the Florida Everglades, has been measured on a weekly basis in South Florida since 1974, but P measurements are highly variable due to random noise in the data. This study applies statistical approaches that calculatethe variability and uncertainty of the P load estimation model based on wet and dry P concentrations and rainfall volume.The average mean and standard deviation of the estimated P deposition rates for 13 sites in South Florida are 41±33 mg P m-2 yr-1. First order analysis of the random and measurement errors in the input variables produces a propagation error estimate in P load calculation. The atmospheric P deposition load shows high spatial and temporal variability with no consistent long-term trends. Because of the random noisy nature of P deposition, estimated P deposition loads have a significant amount of uncertainty no matter what type of collection instrument is used. Thus, duplicate sampling is highly recommended to increase the amount of uncontaminated data. |
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