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Four Studies on Effects of Environmental Factors on the Quality of National Atmospheric Deposition Program Measurements (en Inglés)
U. S. Department Of The Interior (Autor)
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Four Studies on Effects of Environmental Factors on the Quality of National Atmospheric Deposition Program Measurements (en Inglés) - U. S. Department of the Interior
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Origen: Estados Unidos
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Reseña del libro "Four Studies on Effects of Environmental Factors on the Quality of National Atmospheric Deposition Program Measurements (en Inglés)"
Selected aspects of National Atmospheric Deposition Program / National Trends Network (NADP/NTN) protocols are evaluated in four studies. Meteorological conditions have minor impacts on the error in NADP/NTN sampling. Efficiency of frozen precipitation sample collection is lower than for liquid precipitation samples. Variability of NTN measurements is higher for relatively low-intensity deposition of frozen precipitation than for higher-intensity deposition of liquid precipitation. Urbanization of the landscape surrounding NADP/NTN sites is not affecting trends in wet-deposition chemistry data to a measureable degree. Five NADP siting criteria intended to preserve wet-deposition sample integrity have varying degrees of effectiveness. NADP siting criteria for objects within the 90 cones and trees within the 120o cones projected from the collector bucket to sky are important for protecting sample integrity. Tall vegetation, fences, and other objects located within 5 meters of the collectors are related to the frequency of visible sample contamination, indicating the importance of these factors in NADP siting criteria.
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