00000cam 2200000zi 4500 9.958972 CaOODSP 20260302081447 m o d f cr mn||||||||| 260114t20262026qucab ob f000 0 eng d 9780660979878 CaOODSP eng rda CaOODSP eng eng fre n-cn-qu n-cnm-- n-cn-nf ln----- y1y2 Fs97-18/410E-PDF Lizotte, Martine, author. Acidification and CO2-driven conditions in the Estuary and Gulf of St. Lawrence during 2024 / Martine Lizotte, Marjolaine Blais, Joël Chassé, Peter S. Galbraith, Anne-Josée Hébert, and Michel Starr. Mont-Joli, QC : Regional Sciences Branch, Quebec Region, Pelagic and Ecosystemic Sciences Division, Fisheries and Oceans Canada, Maurice Lamontagne Institute, 2026. ©2026 1 online resource (vi, 71 pages) : illustrations (chiefly colour), colour maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian technical report of hydrography and ocean sciences, 1488-5417 ; 410 Includes bibliographical references (pages 28-42). "This report presents an overview of marine acidification and CO2-driven conditions in the Estuary and Gulf of St. Lawrence for 2024, based on data collected through the Atlantic Zone Monitoring Program and the Aquatic Climate Change Adaptation Services Program, led by Fisheries and Oceans Canada. Regional observations are compared against climatological means to assess anomalies and trends of the carbonate system. In 2024, key indicators, including pHT, the carbonate system vulnerability index (CSVI), partial pressure of CO2 (pCO2), saturation states of aragonite (ΩA) and calcite (ΩC), and the substrate-inhibitor ratio (SIR), reveal widespread and depth-dependent stressor patterns across the region. From 2020 and continuing into 2024, the 200 m depth horizon stands out as a zone of sustained vulnerability, with multiple indicators exceeding established stress thresholds and record-setting anomalies in several regions. Hypercapnia is observed at this depth in all deep regions except the Centre Gulf, indicating elevated CO2 levels that may impair physiological function in marine organisms. The upward shoaling of proxies for calcium carbonate formation (SIR) and dissolution (ΩA and ΩC) may compress optimal habitat for calcifiers, with the Northwest Gulf and the Estuary emerging as hotspots of reduced buffering capacity and heightened sensitivity to CO2-driven conditions"--Abstract, page v. Includes abstracts in English and French. Ocean acidification Québec (Province) Saint Lawrence River Estuary. Ocean acidification Saint Lawrence, Gulf of. Seawater Carbon dioxide content Québec (Province) Saint Lawrence River Estuary. Seawater Carbon dioxide content Saint Lawrence, Gulf of. Mer Acidification Québec (Province) Saint-Laurent, Estuaire du. Mer Acidification Saint-Laurent, Golfe du. Eau de mer Teneur en gaz carbonique Québec (Province) Saint-Laurent, Estuaire du. Eau de mer Teneur en gaz carbonique Saint-Laurent, Golfe du. Canada. Department of Fisheries and Oceans, issuing body. Maurice Lamontagne Institute, issuing body. Gulf Fisheries Centre (Canada), issuing body. Canadian technical report of hydrography and ocean sciences ; 410. (CaOODSP)9.504781 PDF 6.71 MB https://publications.gc.ca/collections/collection_2026/mpo-dfo/fs97-18/Fs97-18-410-eng.pdf