Abstract
A standard National Atmospheric Deposition Program (NADP) rain collection bucket was sectioned with 220 test tubes of 1.5 cm diameter. Eleven rains from thunderstorms were collected. Analyses were made for Ca, Na and K concentrations in the test tube liquids. The relative standard deviation (RSD), after correction for the analytical RSD, was 0 to 15% for Ca, 0 to 24% for Na, and 0 to 17% for K. Analytical RSD for Ca, Na and K determined from standards were, respectively, 5.4, 6.6 and 12%. Calculations indicate that the difference of 2 to 3 giant nuclei per test tube of calcite (Ca), sea salt (Na) and clay (K) would account for these different RSDs. Concentration ranges in the rains varied from 0.14 to 2.95 mg L−1 for Ca, 0.024 to 0.23 mg L−1 for Na, and 0.014 to 0.064 mg L−1 for K. The area between the test tubes which was 40% of the total collector area provided a bottom sample which on average agreed within 1.3% of the average value of the test tubes.
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Wagner, G.H., Steele, K.F. Centimeter-scale variability in the chemistry of convective rains. Water Air Soil Pollut 72, 9–18 (1994). https://doi.org/10.1007/BF01257114
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DOI: https://doi.org/10.1007/BF01257114