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001053130 005__ 20260203202226.0
001053130 0247_ $$2doi$$a10.5194/egusphere-egu25-7752
001053130 037__ $$aFZJ-2026-01463
001053130 1001_ $$0P:(DE-Juel1)194406$$aZhang, Yikui$$b0$$eCorresponding author$$ufzj
001053130 1112_ $$aEGU General Assembly 2025$$cVienna$$d2025-04-28 - 2025-05-02$$wAustria
001053130 245__ $$aCausal Dynamics of Land–Atmosphere Coupling under Compound Dry–Hot Events
001053130 260__ $$c2025
001053130 3367_ $$033$$2EndNote$$aConference Paper
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001053130 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1770103737_30799$$xOther
001053130 520__ $$aThe increasing frequency and magnitude of compound dry–hot events (CDHEs) pose significant risks to natural and managed systems. While the role of land–atmosphere coupling in determining the magnitude and evolution of CDHEs has been highlighted, the causal interactions between variables within the coupled system under external forcing remain poorly understood. This study investigates the causal relationships between soil moisture and 2m air temperature, as well as between absorbed shortwave solar radiation and 2m air temperature during CDHEs, based on information flow theory. Using two fully coupled simulations with the Terrestrial Systems Modeling Platform (TSMP), one with and one without irrigation, the information flow analysis provides an interpretable framework to characterize the spatiotemporal variability of the land–atmosphere coupling strength in response to the perturbations such as CDHEs and irrigation. The results show that concurrent dry and hot conditions are characterized by temporal shifts in the evaporative regime towards increased soil moisture–temperature information flow driven by the shift in surface energy partitioning, such that decreases in soil moisture lead to increased temperatures. Meanwhile, irrigation can significantly reduce the frequency and magnitude of CDHEs by directly increasing soil moisture variability and indirectly affecting surface energy fluxes, and thus altering land–atmosphere coupling. However, the impact of irrigation in Europe is predominantly local and limited by the volumes applied. These findings highlight the potential of targeted, region-specific irrigation strategies to attenuate dry and hot extremes. In addition, the information flow framework provides a robust and interpretable tool for diagnosing the functional performance of regional climate models under perturbations, offering new insights for analyzing the impacts of human interventions on the climate system and enhancing our understanding of extreme hydroclimatic events in future studies.
001053130 536__ $$0G:(DE-HGF)POF4-2173$$a2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217)$$cPOF4-217$$fPOF IV$$x0
001053130 536__ $$0G:(GEPRIS)495897999$$aSFB 1502 D02 - Simulation anthropogen bedingter Veränderungen in regionalen Wasser- und Energiekreisläufen (D02) (495897999)$$c495897999$$x1
001053130 588__ $$aDataset connected to CrossRef
001053130 7001_ $$00000-0003-3501-9783$$aHagan, Daniel$$b1
001053130 7001_ $$00000-0001-6186-5751$$aMiralles, Diego G.$$b2
001053130 7001_ $$0P:(DE-Juel1)156253$$aGoergen, Klaus$$b3
001053130 7001_ $$0P:(DE-Juel1)151405$$aKollet, Stefan$$b4$$ufzj
001053130 773__ $$a10.5194/egusphere-egu25-7752
001053130 8564_ $$uhttps://doi.org/10.5194/egusphere-egu25-7752
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