A Critical Conductance Threshold Unifies Contrasting Ecosystem Evapotranspiration Responses to Increasing Vapor Pressure Deficit

作者：Shiqin Xu, Matthew McCabe, Joshua B. Fisher, Stephen Sitch, Ather Abbas, Ningpeng Dong, Wang Ping, Wanqiu Xing, Pierre Friedlingstein, Hylke E. Beck · 发表于：Zenodo (CERN European Organization for Nuclear Research) · 年份：2026 · DOI：10.5281/zenodo.21859562 · 研究领域：Environmental science、Atmospheric sciences

Analysis code for the manuscript "A Critical Conductance Threshold Unifies Contrasting Ecosystem Evapotranspiration Responses to Increasing Vapor Pressure Deficit." Ecosystems show contrasting evapotranspiration (ET) responses to rising vapor pressure deficit (VPD). By integrating the Ball–Berry–Leuning canopy conductance parameterization into the Penman–Monteith model, this work derives an analytical expression in which the sign of ∂ET/∂VPD is governed by whether the conductance slope parameter G₁ exceeds a critical threshold, G₁,crit, computable from routinely measured quantities. The prediction is tested against 305 eddy-covariance sites spanning 2,892 site-years, ECOSTRESS thermal-infrared retrievals, and the TRENDY v12 terrestrial biosphere model ensemble. The archive contains the flux-tower conductance modelling and G₁ estimation, the ECOSTRESS retrieval and sensitivity analysis, and the global-scale TRENDY, ERA5 and CMIP6 analyses, together reproducing every figure in the paper; see README.md for details. The raw-data ingestion stages are not included, as the flux data are distributed by their originating networks under their own policies.