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. Streams draining upland catchments carry large quantities of carbon fromterrestrial stocks to downstream freshwater and marine ecosystems. Here iteither enters long-term storage in sediments or enters the atmosphere asgaseous carbon through a combination of biotic and abiotic processes. Thereare, however, increasing concerns over the long-term stability of terrestrialcarbon stores in blanket peatland catchments as a result of anthropogenicpressures and climate change. We analysed sub-annual and inter-annual changesin river water colour (a reliable proxy measurement of dissolved organiccarbon; DOC) using 6 years of weekly data, from 2011 to 2016. Thistime-series dataset was gathered from three contiguous river sub-catchments,the Black, the Glenamong and the Srahrevagh, in a blanket peatland catchmentsystem in western Ireland, and it was used to identify the drivers that bestexplained observed temporal change in river colour. The data were also usedto estimate annual DOC loads from each catchment. General additive mixedmodelling was used to identify the principle environmental drivers of watercolour in the rivers, while wavelet cross-correlation analysis was used toidentify common frequencies in correlations. At 130 mg Pt Co L −1 ,the mean colour levels in the Srahrevagh (the sub-catchment with lowest rainfall and higher forest cover) were almost50 % higher than those from the Black and Glenamong, at 95 and84 mg Pt Co L −1 respectively. The decomposition of the colourdatasets revealed similar multi-annual, annual and event-based (randomcomponent) trends, illustrating that environmental drivers operatedsynchronously at each of these temporal scales. For both the Black and itsnested Srahrevagh catchment, three variables (soil temperature, soil moisturedeficit, SMD, and the weekly North Atlantic Oscillation, NAO) combined toexplain 54 % and 58 % of the deviance in colour respectively. In theGlenamong, which had steeper topography and a higher percentage of peatintersected by streams, soil temperature, the log of stream discharge and theNAO explained 66 % of the colour concentrations. Cross-wavelettime-series analysis between river colour and each environmental driverrevealed a significant high common power relationship at an annual time step.Each relationship however, varied in phase, further highlighting thecomplexity of the mechanisms driving river colour in the sub-catchments. Theestimated mean annual DOC loads for the Black and Glenamong rivers to LoughFeeagh were similar at 15.0 and 14.7 t C km −2  yr −1 respectively. The important role of past and current precipitation and, inparticular, temperature emphasises the vulnerability of blanket peatlandcarbon stores to projected climate change and highlights the interaction oflocal and regional climate in controlling aquatic carbon export. Our resultsshow that water colour (and hence DOC) concentrations can vary considerablybetween neighbouring catchments and also that regional-scale climatic driverscontrol the trends in intra- and inter-annual flux of DOC through the system.The combination of locally determined concentrations and regionallycontrolled fluxes produces aquatic DOC loads that vary over both the annualcycle and over multiple years.

Synchrony in catchment stream colour levels is driven by both local and regional climate