The Role of Horizontal Resolution in Modeling Irrigation Effects With a Coupled Regional Climate Model System Up To Convection‐Permitting Scale.
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| Title: | The Role of Horizontal Resolution in Modeling Irrigation Effects With a Coupled Regional Climate Model System Up To Convection‐Permitting Scale. |
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| Authors: | Pop, Christina1 (AUTHOR) christina.pop@hereon.de, Böhner, Jürgen2 (AUTHOR), Hoffmann, Peter1 (AUTHOR), Pietikäinen, Joni‐Pekka1 (AUTHOR), Rechid, Diana1 (AUTHOR) |
| Source: | Journal of Geophysical Research. Atmospheres. 9/28/2025, Vol. 130 Issue 18, p1-25. 25p. |
| Subject Terms: | *Irrigation, *Climate feedbacks, Spatial resolution, Atmospheric models, Boundary layer equations, Ecosystem dynamics, Precipitation (Chemistry), Heat convection |
| Geographic Terms: | Northern Italy |
| Abstract: | Increasing the resolution of regional climate models (RCMs) up to convection‐permitting scales enables explicitly resolved convection and finer resolved surface features. In this work, we use the benefits of the high resolution climate model and apply it to model irrigation effects and feedbacks on the local and regional climate, focusing on the interaction of irrigation with soil, surface, atmosphere, and vegetation processes. We employ the RCM REMO2020 interactively coupled to its vegetation module iMOVE and incorporate our newly developed irrigation parameterization. We conduct two simulation sets with and without the irrigation parameterization. In the first set, we employ the hydrostatic model version at 0.11° horizontal resolution for Southwestern Europe. For the second set, we repeat the experiment employing the non‐hydrostatic model version at convection‐permitting resolution of 0.0275° for Northern Italy. Our results indicate that improved vegetation conditions due irrigation, such as an increased canopy conductance, lead to effects in the atmosphere. For the atmosphere, we find more distinct and localized irrigation effects for the simulations at convection‐permitting resolution with enhanced near‐surface cooling of up to −2 K compared to the simulations at 0.11°. In the boundary layer, irrigation effects are highly influenced by turbulence, transporting the irrigation effect to higher levels. The largest differences in representing irrigation effects on the two resolutions were found in precipitation. While at 0.11° horizontal resolution, precipitation increases due to favorable convection conditions, explicitly resolving convection leads to rather mixed effects with a decrease of precipitation above irrigated areas, where the convection inhibition increased. Plain Language Summary: This study investigates irrigation effects and feedbacks on the atmosphere at two different horizontal resolutions using the regional climate model REMO. The model is interactively coupled to its vegetation module iMOVE and incorporates the newly developed irrigation parameterization of Asmus et al. (2023, https://doi.org/10.5194/gmd‐16‐7311‐2023). Simulations are conducted covering Northern Italy at 0.11° and at 0.0275° horizontal resolution, the latter one explicitly resolving convective processes. Irrigation affects vegetational processes such as the intensity of the canopy conductance, as well as surface fluxes and consequently, the boundary layer of the atmosphere. As the higher resolution resolves surface features with more details, the effects of irrigation in the lower atmosphere, such as temperature reduction in 2 m height, develop more distinctly. Boundary layer processes, such as turbulence play an important role in the development of irrigation effects in the atmosphere. Irrigation on precipitation differs between these two resolutions. While at the high resolution with explicitly resolved convection, irrigation leads to a precipitation decrease above the irrigated areas due to convection inhibiting conditions, at the coarse resolution, precipitation increases due to irrigation. However, not above the irrigated areas, but particularly windward at a nearby mountain foot. Key Points: Finer resolved surface features influence modeled irrigation effects, resulting in more localized and distinct effectsCoupled model systems capture interactions between irrigation, vegetation, and the atmosphere, resolving feedback mechanismsWith explicitly resolved convection, irrigation effects on precipitation can differ, leading to a reduction of over irrigated areas [ABSTRACT FROM AUTHOR] |
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| Database: | GreenFILE |
| Abstract: | Increasing the resolution of regional climate models (RCMs) up to convection‐permitting scales enables explicitly resolved convection and finer resolved surface features. In this work, we use the benefits of the high resolution climate model and apply it to model irrigation effects and feedbacks on the local and regional climate, focusing on the interaction of irrigation with soil, surface, atmosphere, and vegetation processes. We employ the RCM REMO2020 interactively coupled to its vegetation module iMOVE and incorporate our newly developed irrigation parameterization. We conduct two simulation sets with and without the irrigation parameterization. In the first set, we employ the hydrostatic model version at 0.11° horizontal resolution for Southwestern Europe. For the second set, we repeat the experiment employing the non‐hydrostatic model version at convection‐permitting resolution of 0.0275° for Northern Italy. Our results indicate that improved vegetation conditions due irrigation, such as an increased canopy conductance, lead to effects in the atmosphere. For the atmosphere, we find more distinct and localized irrigation effects for the simulations at convection‐permitting resolution with enhanced near‐surface cooling of up to −2 K compared to the simulations at 0.11°. In the boundary layer, irrigation effects are highly influenced by turbulence, transporting the irrigation effect to higher levels. The largest differences in representing irrigation effects on the two resolutions were found in precipitation. While at 0.11° horizontal resolution, precipitation increases due to favorable convection conditions, explicitly resolving convection leads to rather mixed effects with a decrease of precipitation above irrigated areas, where the convection inhibition increased. Plain Language Summary: This study investigates irrigation effects and feedbacks on the atmosphere at two different horizontal resolutions using the regional climate model REMO. The model is interactively coupled to its vegetation module iMOVE and incorporates the newly developed irrigation parameterization of Asmus et al. (2023, https://doi.org/10.5194/gmd‐16‐7311‐2023). Simulations are conducted covering Northern Italy at 0.11° and at 0.0275° horizontal resolution, the latter one explicitly resolving convective processes. Irrigation affects vegetational processes such as the intensity of the canopy conductance, as well as surface fluxes and consequently, the boundary layer of the atmosphere. As the higher resolution resolves surface features with more details, the effects of irrigation in the lower atmosphere, such as temperature reduction in 2 m height, develop more distinctly. Boundary layer processes, such as turbulence play an important role in the development of irrigation effects in the atmosphere. Irrigation on precipitation differs between these two resolutions. While at the high resolution with explicitly resolved convection, irrigation leads to a precipitation decrease above the irrigated areas due to convection inhibiting conditions, at the coarse resolution, precipitation increases due to irrigation. However, not above the irrigated areas, but particularly windward at a nearby mountain foot. Key Points: Finer resolved surface features influence modeled irrigation effects, resulting in more localized and distinct effectsCoupled model systems capture interactions between irrigation, vegetation, and the atmosphere, resolving feedback mechanismsWith explicitly resolved convection, irrigation effects on precipitation can differ, leading to a reduction of over irrigated areas [ABSTRACT FROM AUTHOR] |
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| ISSN: | 2169897X |
| DOI: | 10.1029/2024JD043227 |
