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BG3.34 | Trend and inter-annual variability of terrestrial photosynthesis, evapotranspiration, and water use efficiency: from theory and data to Earth system modeling
EDI
Trend and inter-annual variability of terrestrial photosynthesis, evapotranspiration, and water use efficiency: from theory and data to Earth system modeling
Convener: Jiameng LaiECSECS | Co-conveners: Tristan Quaife, Wu Sun, Ying Sun
Terrestrial ecosystems are the lungs of our planet, breathing in carbon dioxide (CO2) through photosynthesis and regulating the hydrological cycle by stomatal control of evapotranspiration. In a rapidly changing world (e.g., with climate change, CO2 fertilization, land use/cover change, and extreme events such as drought, heatwaves, disturbance, etc.), understanding both the long-term trajectory and inter-annual variability of terrestrial photosynthesis, evapotranspiration, and water use efficiency is vital for predicting the fate of terrestrial ecosystems and its feedbacks to the climate system. However, current Earth system models still face considerable challenges representing these processes, especially under ever evolving environmental changes, leading to a remarkable divergency in model-simulated historical and future trajectories of carbon and water fluxes as well as their interactions and their climate feedbacks.

This session aims to synthesize advances in theory and data to improve Earth system model representations of carbon and water cycles and narrow the uncertainty in predictions across local, regional, and global scales. We welcome studies focusing on: 1) process-driven model development that are guided by new theories 2) model constraining and benchmarking with novel datasets (e.g., solar-induced chlorophyll fluorescence, carbonyl sulfide, carbon and oxygen isotopes, remote sensing-based evapotranspiration products, tree rings), from in situ and global measurements, and 3) model prediction (i.e., response and feedback of water/carbon cycle) in the context of changing climate and land use, extreme events (drought or heat waves) and disturbances (e.g., wildfires).