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The perhumid region of the coastal temperate rainforest (CTR) of\udPacific North America is one of the wettest places on Earth and contains\udnumerous small catchments that discharge freshwater and high concentrations\udof dissolved organic carbon (DOC) directly to the coastal ocean. However,\udempirical data on the flux and composition of DOC exported from these\udwatersheds are scarce. We established monitoring stations at the outlets of\udseven catchments on Calvert and Hecate islands, British Columbia, which\udrepresent the rain-dominated hypermaritime region of the perhumid CTR. Over\udseveral years, we measured stream discharge, stream water DOC concentration,\udand stream water dissolved organic-matter (DOM) composition. Discharge and\udDOC concentrations were used to calculate DOC fluxes and yields, and DOM\udcomposition was characterized using absorbance and fluorescence spectroscopy\udwith parallel factor analysis (PARAFAC). The areal estimate of annual DOC\udyield in water year 2015 was 33.3 Mg C km−2 yr−1, with\udindividual watersheds ranging from an average of\ud24.1 to 37.7 Mg C km−2 yr−1. This represents some of the highest\udDOC yields to be measured at the coastal margin. We observed seasonality in\udthe quantity and composition of exports, with the majority of DOC export\udoccurring during the extended wet period (September–April). Stream flow from\udcatchments reacted quickly to rain inputs, resulting in rapid export of\udrelatively fresh, highly terrestrial-like DOM. DOC concentration and measures\udof DOM composition were related to stream discharge and stream temperature and correlated with watershed attributes, including the extent of lakes and\udwetlands, and the thickness of organic and mineral soil horizons. Our discovery\udof high DOC yields from these small catchments in the CTR is especially\udcompelling as they deliver relatively fresh, highly terrestrial organic\udmatter directly to the coastal ocean. Hypermaritime landscapes are common on\udthe British Columbia coast, suggesting that this coastal margin may play an\udimportant role in the regional processing of carbon and in linking\udterrestrial carbon to marine ecosystems

A global hotspot for dissolved organic carbon in hypermaritime watersheds of coastal British Columbia