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Effects of hydraulic redistribution (HR) on hydrological,biogeochemical, and ecological processes have been demonstrated in thefield, but the current generation of standard earth system models does notinclude a representation of HR. Though recent studies have examined theeffect of incorporating HR into land surface models, few (if any) have donecross-site comparisons for contrasting climate regimes and multiplevegetation types via the integration of measurement and modeling. Here, weincorporated the HR scheme of Ryel et al. (2002) into the NCAR CommunityLand Model Version 4.5 (CLM4.5), and examined the ability of the resultinghybrid model to capture the magnitude of HR flux and/or soil moisturedynamics from which HR can be directly inferred, to assess the impact of HRon land surface water and energy budgets, and to explore how the impact maydepend on climate regimes and vegetation conditions. Eight AmeriFlux siteswith contrasting climate regimes and multiple vegetation types were studied,including the Wind River Crane site in Washington State, the Santa RitaMesquite savanna site in southern Arizona, and six sites along the SouthernCalifornia Climate Gradient. HR flux, evapotranspiration (ET), and soil moisturewere properly simulated in the present study, even in the face of variousuncertainties. Our cross-ecosystem comparison showed that the timing,magnitude, and direction (upward or downward) of HR vary across ecosystems,and incorporation of HR into CLM4.5 improved the model-measurement matchesof evapotranspiration, Bowen ratio, and soil moisture particularly duringdry seasons. Our results also reveal that HR has important hydrologicalimpact in ecosystems that have a pronounced dry season but are not overallso dry that sparse vegetation and very low soil moisture limit HR

Combined measurement and modeling of the hydrological impact of hydraulic redistribution using CLM4.5 at eight AmeriFlux sites