Dust transportation and deposition in a superhumid environment,West Coast,South Island,New Zealand |
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| Institution: | 1. Department of Geography, University of Kentucky, Lexington, KY 40506-0027, USA;2. USDA Forest Service, Southern Research Station, P.O. Box 1270, Hot Springs, AR 71902, USA;3. Department of Biosystems and Agricultural Engineering, University of Kentucky, Lexington, KY 40506, USA;4. USDA Forest Service, Ouachita National Forest, P.O. Box 1270, Hot Springs, AR 71902, USA;1. Department of Agriculture and Food, 10 Doney Street, Narrogin, 6312, Western Australia, Australia;2. School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Western Australia, Australia;1. Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA;2. Department of Social Sciences, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA;3. International Joint Commission U.S. Section, 2000 L Street, NW Suite #615, Washington, DC 20440 USA |
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| Abstract: | Contemporary rates of dust deposition monitored along a 300-km section of the superhumid West Coast of New Zealand's South Island are presented. In this setting, dust is entrained primarily from the dry channels of braided glaciofluvial rivers that drain the western slopes of the Southern Alps. Measured dust deposition ranged between 0.21 and 118.9 kg?1 ha?1 month?1, which is similar to dust deposition rates monitored in arid and semiarid environments. However, these are not considered to be sufficient for present day loess genesis. Dust deposition was highest in summer because of the greater frequency of favourable dust transporting winds, and the effect of rainfall was secondary. Dust transportation occurred mainly during the passage of nonprecipitating cold fronts or postfrontal southwesterlies. Transportation also occurred during prefrontal conditions, and in winter föhn southeasterlies were the predominant dust transporting winds to affect the West Coast. |
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