Abstract
AbstractThe 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.
Highlights
Regional climate models (RCMs) are the ideal tool for investigating regional climate and extremes at spatial scales more resolved than the typical global climate model
Comparisons with simulations using the Unified Noah land surface model (LSM) showed that Community Atmosphere Biosphere Land Exchange (CABLE) in NU‐Weather Research and Forecasting (WRF) has a more realistic simulation of evapotranspiration when compared to Global Land surface Evaporation: the Amsterdam Methodology (GLEAM) estimates
Our results show that the diurnal temperature range for WRF‐Land Information System (LIS)‐CABLE is too narrow over eastern Australia during this period with a cool bias of 1–2 °C in TX (Figure 5g) and a warm bias of 2 °C in TN (Figure 5k)
Summary
Regional climate models (RCMs) are the ideal tool for investigating regional climate and extremes at spatial scales more resolved than the typical global climate model. While several RCMs are available, the Weather Research and Forecasting (WRF) model (Skamarock et al, 2008) has a large worldwide community and is used for both operational purposes and research (Skamarock et al, 2019). There are several parameterization options available for radiation (7), planetary boundary layer (13), cumulus convection (13), microphysics (22), and land surface (7) processes leading to an excess of 180,000 possible configurations. A substantial limitation that arises from this capability is that there is limited guidance on which combination of physical parameterizations are suitable and whether there is a dependence on the climate regime of the simulated domain. We examine whether the physics configuration is dependent on the regional climate regime and whether the same configuration can be used for multiple purposes including the simulation of mean climate and extreme events
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