Redefine Droughts In The U.S. Corn Belt: Stomatal Conductance Constraints Attributable to Atmospheric Demand and/or Soil Water Supply

VPD and SWC are highly correlated at longer timescale, so to decouple their contributions, the data are analyzed at a daily timescale. Based on the current results, we find that dry air (high VPD) is found to have a higher impact on stomatal conductance (Gs) variability compared to drysoil (low SWC), which supports our hypothesis. Further study is ongoing to understand the specific underlying processes.