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


Bedrock and Regolith Weathering
Conceptual models of deep CZ structure and function.


Flux PIHM is a fully-coupled land surface hydrologic model with improved land-atmosphere interactions.


Hydrogeochemical Model
Mass balance model for deposition, weathering and transport at SSHCZO.

Isotope Weathering

Isotopic Estimates of Weathering
Isotope geochemistry (Uranium, Thorium, Beryllium) offer estimates of weathering rates at Shale Hills.

Preferential Flow

Hydrologic Flowpaths and Hydropedology
Vertical and lateral flowpaths provide a "short-circuit" for water flux in the shallow subsurface.

Conceptual models allow SSHCZO researchers to concisely express the functional components of the Critical Zone and explore connections between the four core systems of the Critical Zone: Weather/Climate, Soil and Ecology, Hydrology and Hydropedology, and Geomorphology and Weathering. The models detailed here express the current state of knowledge of the SSHCZO team and serve as a basis for discussion between disciplines. When possible, we look to collaborate with other CZOs to refine these models with data from other environments.