ARCHIVED CONTENT: In December 2020, the CZO program was succeeded by the Critical Zone Collaborative Network (CZ Net) ×


The Catalina-Jemez CZO uses a variety of conceptual and numerical models to investigate coupled earth surface processes.

The Critical Zone is a thermodynamic system open to energy and mass transfer from its surroundings.


Environmental Energy and Mass Transfer
Conceptual framework for CZ structure evolution based on nonequilibrium thermodynamics.


Semi-Distributed Hydrologic Model
Semi-distributed hydrological model called hsB-SM (hillslope storage Boussinesq-Soil Moisture)


Terrestrial Integrated Modeling System
A coupled model of hydrological, microbial, geochemical, geomorphological and ecological processes at the Earth’s land surface.