Evaluating a land surface model at a water-limited site: implications for land surface contributions to droughts and heatwaves
نویسندگان
چکیده
Abstract. Land surface models underpin coupled climate model projections of droughts and heatwaves. However, the lack simultaneous observations individual components evapotranspiration, concurrent with root-zone soil moisture, has limited previous evaluations. Here, we use a comprehensive set from water-limited site in southeastern Australia including both evapotranspiration moisture to depth 4.5 m evaluate Community Atmosphere-Biosphere Exchange (CABLE) land model. We demonstrate that alternative process representations within CABLE had capacity improve simulated but not necessarily dynamics–highlighting problems evaluations against water fluxes alone. Our best simulation was achieved by resolving evaporation bias, using more realistic initialisation groundwater aquifer state higher vertical resolution informed observed properties, further calibrating hydraulic conductivity. Despite these improvements, role empirical stress function influencing remained important: site-calibrated reduced on plants 36 % during drought 23 at other times. These changes only seasonal cycle also affect latent sensible heat The range parameterisations tested led differences ∼150 W m−2 flux heatwave, implying strong impact for evaporative cooling feedbacks boundary layer (when coupled). Overall, our results highlight opportunity advance capability capture processes, particularly meteorological extremes, when sufficient profiles are available.
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ژورنال
عنوان ژورنال: Hydrology and Earth System Sciences
سال: 2021
ISSN: ['1607-7938', '1027-5606']
DOI: https://doi.org/10.5194/hess-25-447-2021