A field study of orographic precipitation anomalies during high velocity winds using an aerofoil rain gauge |
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| Authors: | C J G Morris M Nunez S Montes |
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| Institution: | (1) Department of Geography and Environmental Studies, The University of Tasmania, Hobart, Tasmania, Australia;(2) Department of Civil and Mechanical Engineering, The University of Tasmania, Hobart, Tasmania, Australia;(3) Present address: School of Earth Sciences, The University of Melbourne, 3052 Parkville, Victoria, Australia |
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| Abstract: | Summary This study was prompted by a need to explain an anomaly in the apparent precipitation distribution over a prominent mountain subject to a high velocity westerly airstream. Historical data reveal that the lee receives 58% more precipitation than the summit. A novel rain gauge with a vertically orientated collecting orifice, 3 standard rain gauges and complementary wind data were procured from 3 sites on the mountain to assess the effect of the airstream on the precipitation distribution. The catch efficiency of standard rain gauges decrease after the wind velocity exceeds 2.5 ms–1 Results indicate that the summit actually receives 59% more precipitation than the lee, where a vortex directly affects the precipitation distribution over, and east, of the mountain.With 11 Figures |
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