Wind-blown volcanic ash in forest and agricultural locations as related to meteorological conditions |
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| Institution: | 1. Università degli Studi di Palermo, Palermo, Italy;2. Ministero delle Politiche Agricole, Alimentari e Forestali, Roma, Italy;3. CNRS/Université de Poitiers, Poitiers, France;4. Università degli Studi di Napoli Federico II, Portici, Italy;1. University of Minnesota, Dept. of Soil, Water, and Climate, 430 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108, United States;2. University of Delaware, Department of Plant and Soil Sciences, 531 S College Ave. 152 Townsend Hall, Newark, DE 19716-2170, United States;3. Stroud Water Research Center, 970 Spencer Road, Avondale, PA 19311, United States;4. Climate Impacts Research Centre, Department of Ecology and Environmental Science, Umeå University, SE-90187 Umeå, Sweden |
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| Abstract: | During the spring and summer of 1981, airborne ash previously deposited from the 1980 eruption of Mount St. Helens volcano was monitored at several field locations near the major axis of the depositional pattern in Washington State. Airborne ash was collected daily with standard high-volume samplers and other equipment that sampled the ash at selected windspeeds. Analysis of high-volume filtered deposits showed poor linear correlations to local meteorological conditions. At Moses Lake, weights of windspeed-selected samples indicated an exponential increase in suspended material with increasing windspeed.Wind tunnel tests with ash from two locations varying in distance from the volcano showed that the finer ash fractions from both locations became airborne at similar windspeeds. Threshold wind velocity was about 12 km h−1 for newly deposited ash, compared to more than 69 km h−1 for ash consolidated by wetting and drying. |
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