Evaluation of the CABLEv2.3.4 land surface model coupled to NU-WRFv220.127.116.11 in simulating temperature and precipitation means and extremes over CORDEX AustralAsia within a WRF physics ensemble.
Hirsch, A.L., J. Kala, C.C. Carouge, M.G. De Kauwe, G. Di Virgilio, A.M. Ukkola, J.P. Evans, G. Abramowitz
Journal of Advances in Modeling Earth Systems, 11(12), 4466-4488, doi: 10.1029/2019MS001845, 2019.
The Community Atmosphere Biosphere Land Exchange (CABLE) model is a third‐generation
land surface model (LSM). CABLE is commonly used as a stand‐alone LSM, coupled to the Australian
Community Climate and Earth Systems Simulator global climate model and coupled to the Weather
Research and Forecasting (WRF) model for regional applications. Here, we evaluate an updated version of
CABLE within a WRF physics ensemble over the COordinated Regional Downscaling EXperiment
(CORDEX) AustralAsia domain. The ensemble consists of different cumulus, radiation and planetary
boundary layer (PBL) schemes. Simulations are carried out within the NASA Unified WRF modeling
framework, NU‐WRF. Our analysis did not identify one configuration that consistently performed the best
for all diagnostics and regions. Of the cumulus parameterizations the Grell‐Freitas cumulus scheme
consistently overpredicted precipitation, while the new Tiedtke scheme was the best in simulating the
timing of precipitation events. For the radiation schemes, the RRTMG radiation scheme had a general warm
bias. For the PBL schemes, the YSU scheme had a warm bias, and the MYJ PBL scheme a cool bias.
Results are strongly dependent on the region of interest, with the northern tropics and southwest Western
Australia being more sensitive to the choice of physics options compared to southeastern Australia which
showed less overall variation and overall better performance across the ensemble. Comparisons with
simulations using the Unified Noah LSM showed that CABLE in NU‐WRF has a more realistic simulation of
evapotranspiration when compared to GLEAM estimates.
Figure 2. Relative overall skill score for climate variables per successful physics configuration evaluated according to
annual and seasonal means and aggregated over the three regions denoted in Figure 1. The absolute skill scores are
available in the supporting information. Interpretation: Green indicates relative high skill while red indicates relatively
poor skill. Note that evaluation of the latent heat flux is against GLEAM.
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Last updated 23 January 2018