The flux of carbon from rivers: the case for flux from England and Wales |
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Authors: | Fred Worrall Tom Guilbert Tim Besien |
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Institution: | (1) Department of Geological Sciences, Science Laboratories, South Road, Durham, DH1 3LE, UK;(2) Environment Agency, National Data Unit, Lower Bristol Road, Bath, BS2 9ES, UK;(3) Environment Agency, National Data Centre, Twerton, UK |
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Abstract: | This study uses the extensive monitoring datasets of the Environment Agency of England and Wales to calculate the flux of
dissolved organic carbon (DOC); particulate organic carbon (POC); and excess dissolved CO2 through English and Welsh rivers. The innovation of this study’s approach is to account for the losses of carbon within the
fluvial system as well as fluxes at the catchment outlet. In order to make this assessment this study considers: the biochemical
oxygen demand (BOD) as a measure of the degradation of DOC; and the dissolved CO2 concentration of groundwater as calculated and apportioned into surface waters on the basis of Ca concentrations. The study
shows that the best estimate of carbon export, via rivers, from England and Wales is 10.34 Mg C/km2/year, with 4.19 Mg C/km2/year of this going to the atmosphere. The mapping of the carbon export shows that there are regional hotspots of carbon export
and in a small number of cases rivers could be net sinks of carbon due to their low dissolved CO2 content relative to the atmosphere. The flux calculated by this approach is probably still an underestimate of the carbon
flux through fluvial systems but the scale of the export is greater than that previously reported and there is evidence that
the fluvial flux of carbon is increasing on a decadal scale. |
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Keywords: | Carbon Rivers DOC POC Dissolved CO2 |
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