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Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites
Published on: June 24, 2019
Global CMIP6-based datasets of vegetation-responsive and feedback-deflated potential evapotranspiration
Daeha Kim1, Seulchan Lee2, Minha Choi3,4,5
1Department of Civil Engineering, Jeonbuk National University, Jeonju, Jeonbuk State, 54896, Republic of Korea.
This study introduces vegetation-responsive potential evapotranspiration (PETveg) and wet-environment PET (WETveg) datasets. These datasets improve climate models by accounting for vegetation changes and atmospheric feedbacks, crucial for understanding water cycles.
Area of Science:
- Earth System Science
- Hydrology
- Ecology
Background:
- Conventional potential evapotranspiration (PET) models overlook vegetation dynamics and atmospheric feedbacks.
- Rising CO2 and vapor pressure deficit (VPD) influence vegetation physiology and aridity.
Purpose of the Study:
- To present a global dataset of vegetation-responsive PET (PETveg) and wet-environment PET (WETveg).
- To address limitations in current PET formulations by incorporating vegetation and feedback mechanisms.
Main Methods:
- Utilized 12 Earth system models from the Coupled Model Intercomparison Project Phase 6 (CMIP6).
- Employed a physically and physiologically based two-source Penman-Monteith formulation for PETveg.
- Applied the complementary evaporation principle to derive WETveg, removing feedback amplification.
Main Results:
- Generated a global gridded dataset (1°x1°) at monthly resolution.
- Dataset covers the historical period (1850-2014) and future scenarios (2015-2100) under various Shared Socioeconomic Pathways (SSPs).
- Provides distinct yet consistent representations of atmospheric evaporative demand.
Conclusions:
- The PETveg and WETveg datasets offer improved tools for evaluating PET formulation uncertainty.
- Essential for advancing hydrological, ecological, and climate-impact studies.
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