This title appears in the Scientific Report :
2023
Linking the atmospheric water cycle and land-atmosphere coupling from fully coupled TSMP simulations through a novel atmospheric moisture analysis framework
Linking the atmospheric water cycle and land-atmosphere coupling from fully coupled TSMP simulations through a novel atmospheric moisture analysis framework
The alterations in land-atmosphere coupling, caused by greenhouse gas forcing and human water use, have a significant impact on the atmospheric water balance. However, detecting and attributing these effects under multiple anthropogenic forcings is challenging, partly because a number of confounding...
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Personal Name(s): | Zhang, Yikui (Corresponding author) |
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Wangner, NIklas / Görgen, Klaus / Kollet, Stefan | |
Contributing Institute: |
Agrosphäre; IBG-3 |
Imprint: |
2023
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Conference: | TERENO 2023, Bonn (Germany), 2023-09-25 - 2023-09-29 |
Document Type: |
Conference Presentation |
Research Program: |
Simulation anthropogen bedingter Veränderungen in regionalen Wasser- und Energiekreisläufen (D02) Agro-biogeosystems: controls, feedbacks and impact |
Publikationsportal JuSER |
The alterations in land-atmosphere coupling, caused by greenhouse gas forcing and human water use, have a significant impact on the atmospheric water balance. However, detecting and attributing these effects under multiple anthropogenic forcings is challenging, partly because a number of confounding interactions often influence the variables used in analyses. Moreover, the lack of climatologies of the coupled groundwater to atmosphere system, that consistently represent scenarios under anthropogenic interventions, limits the detection of individual contributing factors. As part of the DETECT Collaborative Research Centre (https://sfb1502.de/), we address these challenges, through fully-coupled terrestrial system, groundwater-to-atmosphere simulations with the Terrestrial Systems Modelling Platform (https://www.terrsysmp.org/) regional climate system model. The ERA5 reanalysis-driven evaluation runs are conducted with and without an irrigation scheme over the COrdinated Regional Downscaling EXperiment (CORDEX) EUR-11 domain at about 12km resolution from 1979 to 2021. Simulations also contribute in parts to the new ensemble of CORDEX regional climate scenarios. Additionally, we are developing a physically-based diagnostics and analysis framework to detect and attribute the impacts of GHG forcing and irrigation on the atmospheric water cycle and L-A coupling strength based on our simulations. From the perspective of the atmospheric moisture budget, so far, we established a proportionality relationship between cloud water content and rainwater content based on the atmospheric water balance equation. By incorporating microphysics and statistical relationships, we represent evapotranspiration and precipitation using surface specific humidity and total water vapor. This preliminary framework enables to draw a direct connection of moisture terms from the near surface to the troposphere, providing insights into the interactions within the atmospheric water cycle. Moreover, we anticipate that the proportionality relationship between cloud and rainwater content can elucidate how thermodynamic and dynamic factors, such as the wind field and circulation changes, influence cloud and precipitation formation and quantify the land-atmosphere coupling strength. |