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Area of Science:

  • Earth System Science
  • Soil Hydrology
  • Biogeophysics

Background:

  • Earth System Models (ESMs) often use pedo-transfer functions for soil hydraulic information, primarily relying on soil texture.
  • These models frequently overlook the crucial role of soil structure, which originates from soil biophysical activity.

Purpose of the Study:

  • To investigate the impact of including soil structural features on local and global hydrologic and climatic responses.
  • To assess the limitations of current ESMs in capturing soil structure's influence.

Main Methods:

  • Systematic inclusion of soil structural features of biophysical origin into models.
  • Analysis of local infiltration-runoff partitioning and recharge.
  • Evaluation of global surface fluxes and climate responses in ESMs.

Main Results:

  • Local hydrologic responses, including infiltration-runoff partitioning and recharge, are significantly altered by soil structure, especially in wet and vegetated areas.
  • Global climate effects of soil structure are masked by ESMs' coarse spatial resolution and inability to simulate intense, short rainfall events.

Conclusions:

  • Soil structure plays a critical role in local hydrologic processes.
  • The influence of soil structure on global-scale climate remains largely elusive in current Earth System Models.