Multicentury reconstruction of streamflow for the Abitibi River basin and estimation of potential climate changes impacts

NOLIN (LTRR) CRNSG-CRD Project Meeting 2023, September 27 Project aims & Study area Reconstruction of high spring discharge of the Abitibi Plains since the end of the Little Ice Age (1750 to present) and projections of the potential climate change effects 1915–2022 Alexandre F. [...] NOLIN (LTRR) CRNSG-CRD Project Meeting 2023, September 27 3 Flood rings in black ash FLOOD RING = more numerous and smaller earlywood vessels compared to normal tree rings 1979 1989 Spring Flood Spring Flood One year Fraxinus nigra Tree growth Lake Duparquet DPL119KNR2B Nolin et al., 2021a 1cm Alexandre F. [...] NOLIN (LTRR) CRNSG-CRD Project Meeting 2023, September 27 4 Flood rings in black ash – Quantitative Analyses FLOOD RING = more numerous and smaller earlywood vessels compared to normal tree rings 1979 1989 Spring Flood Spring Flood ≥ 3,000 µm One year Fraxinus nigra Tree growth Lake Duparquet DPL119KNR2B Nolin et al., 2021a 1cm Alexandre F. [...] NOLIN (LTRR) CRNSG-CRD Project Meeting 2023, September 27 5 Proxies of the total spring freshet amplitude Year APRIL 15 – JUNE 30 ~ TOTAL AMPLITUDE OF THE SPRING FRESHET Alexandre F. [...] NOLIN (LTRR) CRNSG-CRD Project Meeting 2023, September 27 9 Flood rings in black ash – Semi-Quantitative Analyses … 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 1 - 2 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 2 -0 - 0 - 0 - 0 - 0 - 0 - 1 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 Spring flood F2 magnitude of the Harricana River 1943 1986 1947 F1 F0 Intensity of vessel modifications F0 F1 F2 no change incr.