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- W2973318207 endingPage "124157" @default.
- W2973318207 startingPage "124157" @default.
- W2973318207 abstract "The potential impact of shrub expansion on the ecosystem is still under debate. In this study, we parameterized shrubland in the Canadian Land Surface Scheme (CLASS) as its fifth plant functional type. We then used CLASS to simulate the hydrological processes in water-stressed shrub-covered sites in the US Southwest and the Mediterranean. CLASS overestimates evapotranspiration (ET) and underestimates runoff at the annual time scale. Rainy season ET overestimation is attributable to the overestimation of soil evaporation. In the CLASS base run, in the Mediterranean, plant transpiration demonstrates low sensitivity to water stress during dry summers. Overly early depletion of soil water leads to the consequent underestimation of ET at the end of dry seasons. In addition, the ratio of transpiration to total ET is underestimated compared with observations. We calibrated the hydrological processes in CLASS accordingly, with the aim of reducing soil evaporation (which dominates ET in the wet seasons) and increasing the sensitivity of plant transpiration to water stress. The newly introduced parameterization is able to capture well the hydrological dynamics in these four study sites at the monthly time scale. Still, our proposed parameterization for soil evaporation demonstrates high sensitivity to soil composition and needs further calibrations in other regions to guarantee its general applicability." @default.
- W2973318207 created "2019-09-26" @default.
- W2973318207 creator A5016907659 @default.
- W2973318207 creator A5061955485 @default.
- W2973318207 date "2019-12-01" @default.
- W2973318207 modified "2023-10-14" @default.
- W2973318207 title "Introducing water-stressed shrubland into the Canadian Land Surface Scheme" @default.
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