Identifying DOC gains and losses during a 20-year record in the Trout Beck catchment,Moor House,UK |
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| Institution: | 1. Geography, School of Environment, Education and Development, University of Manchester, Oxford Road, Manchester M13 9PL, UK;2. Department of Earth Sciences, Durham University, Science Laboratories, South Road, Durham DH1 3LE, UK;1. Institute of Environmental Engineering, Warsaw University of Life Sciences-SGGW, ul. Nowoursynowska 166, 02-787 Warsaw, Poland;2. Vytautas Magnus University, Faculty of Forest Science and Ecology, Studentu Str. 13, Kauno r., LT-53362 Akademija, Lithuania;3. Greifswald University, Institute for Botany and Landscape Ecology, Partner in the Greifswald Mire Centre, Soldmannstraße 15, 17487 Greifswald, Germany;4. Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45 E, 15-351 Bialystok, Poland;5. Lithuanian Fund for Nature, Algirdo Str. 22-3, LT-03218 Vilnius, Lithuania;6. Vytautas Magnus University, Institute of Water Resources Engineering, Universiteto Str. 10, LT-53361 Kaunas-Akademija, Lithuania;7. Nature Park Vishtynetsky, Sovetskiy Prospekt 13-17, 236022 Kaliningrad, Russia;8. Nature Research Centre, Zaliuju Ezeru 49, LT-12200 Vilnius, Lithuania;9. Succow Foundation, Partner in the Greifswald Mire Centre, Ellernholzstraße 1, 17489 Greifswald, Germany |
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| Abstract: | The turnover of organic carbon in rivers could represent a large source of greenhouse gases to the atmosphere and studies have suggested that of the order of 70% of the dissolved organic carbon exported from soils could be lost in rivers before it flows to continental seas. The Environmental Change Network (ECN) monitoring of the dominantly peat-covered Trout Beck catchment within the Moor House site enabled the amount of dissolved organic carbon (DOC) lost within a stream over a 20-year period to be estimated. The study compared DOC concentrations of precipitation, shallow and deep soil waters with those at the catchment outlet. The mass balance between source and outlet was reconstructed by two methods: a single conservative tracer; and based upon a principal component analysis (PCA) using multiple tracers. The study showed the two methods had different outcomes, with the PCA showing a DOC gain and the single tracer showing a DOC loss. The DOC gain was attributed to an unmeasured groundwater contribution that dominates when the river discharge is lower. The DOC loss was related to the in-stream residence time, the soil temperature and month of the year, with longer in-stream residence times, warmer soils and summer months having larger DOC losses. The single tracer study suggested a 10 year average loss of 8.77 g C m?2 year?1, which is 33.1 g CO2eq m?2 year?1, or 29% of the DOC flux from the source over a mean in-stream residence time of 4.33 h. |
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| Keywords: | Mass balance Dissolved organic carbon ECN |
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