Headwater gas exchange quantified from O₂ mass balances at the reach scale.

ABSTRACT: Headwater streams are important in the carbon cycle and there is a need to better parametrize and quantify exchange of carbon-relevant gases. Thus, we characterized variability in the gas exchange coefficient (k ₂) and dissolved oxygen (O₂) gas transfer velocity (k) in two lowland headwaters of the River Avon (UK). The traditional one-station open-water method was complemented by in situ quantification of riverine sources and sinks of O₂ (i.e., groundwater inflow, photosynthesis, and respiration in both the water column and benthic compartment) enabling direct hourly estimates of k ₂ at the reach-scale (~ 150 m) without relying on the nighttime regression method. Obtained k ₂ values ranged from 0.001 h^-

SUBMITTER: Rovelli L 

PROVIDER: S-EPMC6220971 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature