Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 12 2 2008 10.5194/hess-12-625-2008 http://www.hydrol-earth-syst-sci.net/12/625/2008/ http://www.hydrol-earth-syst-sci.net/12/625/2008/hess-12-625-2008.html http://www.hydrol-earth-syst-sci.net/12/625/2008/hess-12-625-2008.pdf 625 634 2008-03-20 Fluvial organic carbon flux from an eroding peatland catchment, southern Pennines, UK R. R. Pawson richard.pawson@manchester.ac.uk D. R. Lord M. G. Evans T. E. H. Allott Upland Environment Research Unit, Geography, School of Environment and Development, Arthur Lewis Building, University of Manchester, Oxford Road, Manchester, M13 9PL, UK This study investigates for the first time the relative importance of dissolved organic carbon (DOC) and particulate organic carbon (POC) in the fluvial carbon flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual flux of fluvial organic carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of flux in only 8% of the time. On an annual cycle, exports of 35.14 t organic carbon (OC) are estimated from the catchment, which represents an areal value of 92.47 g C m^−2 a^−1. POC was the most significant form of organic carbon export, accounting for 80% of the estimated flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments. Armstrong, A., Cox, N. J., Warburton, J., Evans, M., and Holliday, V. J.: The effect of rating curve model fit on suspended sediment load estimates and the assessment of model fit, Geophys. Res. Abstr., 8, European Geosciences Union, 2006. 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