Abstract
Editorial: Chemical Export to River Systems From the Critical Zone
Highlights
Chemical Export to River Systems From the Critical ZoneChemical fluxes to river systems may originate in soils, where various plant and carbonmediated physical and biogeochemical processes are expected to dominate, or from weathering of bedrock (saprolite) in the shallow Critical Zone where rock forming minerals dissolve, to the deeper Critical Zone where flow paths with long travel times may produce more concentrated solutions high in metals, anions, and cations
There is a growing recognition that the Critical Zone (CZ), extending from the vegetation canopy into soils and deeper permeable bedrock, is an important source of chemical constituents that make their way into river systems
Chemical fluxes to river systems may originate in soils, where various plant and carbonmediated physical and biogeochemical processes are expected to dominate, or from weathering of bedrock in the shallow Critical Zone where rock forming minerals dissolve, to the deeper Critical Zone where flow paths with long travel times may produce more concentrated solutions high in metals, anions, and cations
Summary
Chemical fluxes to river systems may originate in soils, where various plant and carbonmediated physical and biogeochemical processes are expected to dominate, or from weathering of bedrock (saprolite) in the shallow Critical Zone where rock forming minerals dissolve, to the deeper Critical Zone where flow paths with long travel times may produce more concentrated solutions high in metals, anions, and cations. Studies by Lebedeva and Brantley (2020) and Wan et al (2021) provided the basis for a new conceptual model that places the chemical weathering front in the hillslope at the position of the water table, which moves up and down by about 2 m over the course of the year In this case, the primary mineralogy of the shale undergoing weathering includes pyrite, which reacts with oxygen in the soil porewater to form sulfate and acidity that contribute further to the weathering process.
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