Numerical Simulations of the Impacts of Land-Cover Change on Cold Fronts in South-West Western Australia |
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| Authors: | J Kala T J Lyons U S Nair |
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| Institution: | (1) National Exposure Research Laboratory, U.S. Environmental Protection Agency (E243-05), Research Triangle Park, NC 27711, USA;(2) Southern Research Station, U.S. Forest Service, 3041 Cornwallis Road, Research Triangle Park, NC 27709, USA |
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| Abstract: | The south-west of Western Australia has experienced significant land-cover change as well as a decline in rainfall. Given
that most precipitation in the region results from frontal passages, the impact of land-cover change on the dynamics of cold
fronts is explored using the Regional Atmospheric Modeling System version 6.0. Frontal simulations are evaluated against high
resolution atmospheric soundings, station observations, and gridded rainfall analyses and shown to reproduce the qualitative
features of cold fronts. Land-cover change results in a decrease in total frontal precipitation through a decrease in boundary-layer
turbulent kinetic energy and vertically integrated moisture convergence, and an increase in wind speed within the lower boundary
layer. Such processes contribute to reduced convective rainfall under current vegetation cover. |
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