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Seasonality of epCO2 at different scales along an integrated river continuum within the Dee basin, NE Scotland by Dr Julian J.C. Dawson; Chris Soulsby; Markus Hrachowitz; Mark Speed; Doerthe Tetzlaff is a Environmental Science article available to read on EtoBox.

What is Seasonality of epCO2 at different scales along an integrated river continuum within the Dee basin, NE Scotland about?

## Abstract Spatial and temporal variations of free CO~2~ concentrations in surface waters are mainly controlled by dynamic processes encompassing terrestrial inputs and in‐stream biotic cycling. Free CO~2~ can be expressed as ‘excess partial pressure of CO~2~’ (__ep__CO~2~), indicating supersaturation or under‐saturation with respect to atmospheric CO~2~. Seasonal patterns of __ep__CO~2~ at sites draining nested upland catchments between 3·40 and 1837 km^2^ were assessed within the River Dee basin in NE Scotland. __Ep__CO~2~ values ranged from 0·14 at the lowermost site on the mainstem in autumn to 12·7 on a major tributary during spring. A seasonality index was derived to describe contrasting winter/spring maxima and summer/autumn minima as annual mean __ep__CO~2~ values could not clearly distinguish between different sites. Seasonal differences tended to increase downstream as progressive changes in physicochemical conditions enhanced the influence of autotrophic communities. However, perturbations to this continuum occurred as CO~2~ inputs from high DOC, heterotrophic tributaries and land‐use changes between open moorland and forest affected downstream continuity. Major tributa

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Author

Dr Julian J.C. Dawson; Chris Soulsby; Markus Hrachowitz; Mark Speed; Doerthe Tetzlaff

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0885-6087)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)