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. Analysis of short sediment cores collected in Grand Lake, Labrador, revealed that this lake is an excellent candidate for the preservation of a laminated sediment record. The great depth of Grand Lake, the availability of finesediments along its tributaries and its important seasonal river inflowhave favoured the formation of a 160-year-long clastic varved sequence.Each varve represents 1 hydrological year. Varve formation is mainlyrelated to spring discharge conditions with contributions from summer andautumn rainfall events. The statistically significant relation between varveparameters and the Naskaupi River discharge observations provided theopportunity to develop local hydrological reconstructions beyond theinstrumental period. The combined detrital layer thickness and the particlesize (99th percentile) series extracted from each varve yield the strongestcorrelations with instrumental data (r=0.68 and 0.75 respectively) and have been usedto reconstruct the respective Naskaupi River mean and maximum annual discharges over the 1856–2016 period. The reconstructed Q-mean seriessuggest that high Q-mean years occurred during the 1920–1960 period, and aslight decrease in Q-mean took place during the second half of the20th century. Independent reconstructions based on rainfall–runoffmodelling of the watershed from historical reanalysis of global geopotentialheight fields display a significant correlation with the reconstructedNaskaupi River discharge based on varve physical parameters. The Grand Lakevarved sequence contains a regional hydrological signal, as suggested by thestatistically significant relation between the combined detrital layerthickness series and the observed Labrador region Q-mean series extractedfrom five watersheds of different sizes.

climate of the past

Reconstructing past hydrology of eastern Canadian boreal catchments using clastic varved sediments and hydro-climatic modelling: 160 years of fluvial inflows