Hydrological and biogeochemical variations among high-elevation, lowland tropical, chaparral and forested temperate catchments lead to different temporal behaviors in fluxes of water and solutes. Examples of these behaviors, based on field investigations, will be provided for catchments in coastal California, the Sierra Nevada and tropical Brazil. Exchanges of gases between the atmosphere and inland waters are quantitatively significant aspects of material cycles. The mechanisms of these exchanges are usually parameterized without regard to within water turbulence, but recent analyses offer evidence for the utility of inclusion of this process. Examples of biogeochemically significant fluxes and mechanisms for exchanges will be offered.
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