Impact of dynamic albedo and vegetation fraction on the simulation of drought in south-east Australia using a regional climate model.
Evans, J.P., M.F. McCabe and X.H. Meng
Remote Sensing and Hydrology Symposium, 27-30 September 2010, Jackson Hole, USA. In Neale & Cosh (eds) Remote Sensing and Hydrology, IAHS Publ. 352 (2012) ISBN 978-1-907161-27-8.
The Weather Research and Forecasting (WRF) regional model was run from 2000 to 2009 over
southeast Australia. During this period the region entered into and later (partially) recovered, from a severe
drought. The model used the following physics schemes: WRF Single Moment 5-class microphysics
scheme; Rapid Radiative Transfer Model (RRTM) longwave radiation scheme; Dudhia shortwave radiation
scheme; Monin-Obukhov surface layer similarity; Noah land-surface scheme; Yonsei University boundary
layer scheme and Kain-Fritsch cumulus physics scheme. The model simulation uses boundary conditions
from the NCEP/NCAR reanalysis with an outer 50 km resolution nest and an inner 10 km resolution nest.
Both nests used 30 vertical levels spaced closer together in the planetary boundary layer. WRF was run in
control mode with the default climatological surface albedo and vegetation fraction datasets, as well as with
these datasets prescribed using satellite data. Comparison of these simulations demonstrates the importance
of capturing the dynamic nature of these fields as the climate moves into (and then out of) a persistent multi-
year drought. Both simulations capture the drought reasonably well, emphasising changes in the large scale
circulation as a primary cause. Differences in the surface conditions do however provide regional differences
in the drought severity and speed of recovery.
Figure 2: Default WRF and satellite based albedo and vegetation fraction for the arid and vegetated
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Last updated 31st January 2013