Sensitivity of montane grassland water fluxes to warming and elevated CO2 from local to catchment scale: A case study from the Austrian Alps

21080 6 112162 2 338731 document 112162 1-s2.0-S2214581824003197-main.pdf application/pdf 56ce97497e59488ee43adce790f5d852 MD5 3599286 2025-12-16 10:17:12 https://pure.iiasa.ac.at/id/eprint/21080/1/1-s2.0-S2214581824003197-main.pdf 21080 1 1 application/pdf text en public cc_by_4

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/112162 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/112162 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/112162 archive 353 disk0/00/02/10/80 2025-12-16 10:18:35 2025-12-16 10:18:35 2025-12-16 10:18:35 article show Vremec M. Burek P. 2091 0000-0001-6390-8487 Guillaumot L. 9207 0000-0002-6579-6287 Radolinski J. Forstner V. Herndl M. Stumpp C. Bahn M. Birk S. Sensitivity of montane grassland water fluxes to warming and elevated CO2 from local to catchment scale: A case study from the Austrian Alps pub BNR WAT Study region: Montane grassland within the Gulling catchment, Austrian Alps. Study focus: A climate-change experiment in a grassland ecosystem used lysimeters and HYDRUS-1D models to quantify changes in evapotranspiration (ET) and groundwater recharge (GWR) due to warming (＋3 °C) and elevated concentrations ( ; ＋300 ppm). Findings at the plot-scale were generalized and transferred to the surrounding catchment, half comprised of grassland, using three lumped rainfall–runoff models and two spatially-distributed Community Water Models, differing in soil hydraulic properties. New hydrological insights for the region: Warming increased ET and decreased GWR and river discharge compared to ambient conditions. increased stomatal resistance, which partially offset warming effects. In scenarios combining warming and , the impact of warming was higher than effect. Elevation influenced the sensitivity of ET to warming, which was greater at the catchment scale than at the plot scale, while GWR was more sensitive to warming at the plot scale. Under dry conditions, GWR and discharge exhibited increased sensitivity to warming at both scales. HYDRUS-1D successfully reproduced lysimeter experiment results and their sensitivity to warming and . Despite model agreement on water flux sensitivity to climate changes, the varying response magnitudes highlight the need for a multi-model approach in climate impact assessments. This study provides insights into how climate change might impact hydrological dynamics of montane grassland systems across the Central European Alps. 2024-12 published doi:10.1016/j.ejrh.2024.101970 46 3155 public Journal of Hydrology: Regional Studies 56 e01970 1 TRUE 22145818 info:eu-repo/semantics/article