Articles | Volume 20, issue 4
https://doi.org/10.5194/bg-20-839-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-839-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Temporal and spatial evolution of bottom-water hypoxia in the St Lawrence estuarine system
Mathilde Jutras
CORRESPONDING AUTHOR
Department of Earth and Planetary Sciences, McGill University, 3450
University Street, Montreal, QC, H3A OE8, Canada
Université Laval, 1045 av. de la Médecine, Québec, QC, G1V 0A6, Canada
Alfonso Mucci
Department of Earth and Planetary Sciences, McGill University, 3450
University Street, Montreal, QC, H3A OE8, Canada
Université du Québec à Montréal, 201 av. du Président-Kennedy, Montréal, QC, H2X 3Y7, Canada
Gwenaëlle Chaillou
Institut des Sciences de la Mer de Rimouski (ISMER) – Université du Québec à Rimouski, 300 Allée des Ursulines, Rimouski, QC, G5L 3A1, Canada
Université Laval, 1045 av. de la Médecine, Québec, QC, G1V 0A6, Canada
William A. Nesbitt
Department of Oceanography, Dalhousie University, Steele Ocean
Sciences Building, 1355 Oxford St., P.O. Box 15000, Halifax, NS, B3H
4R2, Canada
Douglas W. R. Wallace
Department of Oceanography, Dalhousie University, Steele Ocean
Sciences Building, 1355 Oxford St., P.O. Box 15000, Halifax, NS, B3H
4R2, Canada
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Cited
12 citations as recorded by crossref.
- Macrozoobenthic Diversity along an Oxygen Gradient in the Deep Trough of the Gulf of St. Lawrence (Canada) M. Zettler & F. Pollehne 10.3390/d15070854
- A high-resolution physical–biogeochemical model for marine resource applications in the northwest Atlantic (MOM6-COBALT-NWA12 v1.0) A. Ross et al. 10.5194/gmd-16-6943-2023
- Can green hydrogen production be used to mitigate ocean deoxygenation? A scenario from the Gulf of St. Lawrence D. Wallace et al. 10.1007/s11027-023-10094-1
- Mixing behaviour and sources of Ag, Pd, and other trace elements in the Estuary and Gulf of St. Lawrence under winter conditions D. Dang et al. 10.1016/j.chemosphere.2024.142935
- Deep inflow transport and dispersion in the Gulf of St. Lawrence revealed by a tracer release experiment S. Stevens et al. 10.1038/s43247-024-01505-5
- Isotopic and molecular analyses of n-alkanes in a temporal study of coastal sediment contributions to organic carbon degradation induced by algal bloom and terrestrial runoff Y. Mirzaei et al. 10.1016/j.scitotenv.2024.178071
- Living at depth: ecophysiological condition of Boreomysis arctica in autumn and winter in the St. Lawrence estuary and gulf G. Winkler et al. 10.1093/plankt/fbae022
- Otoliths as chemical archives through ontogeny reveal distinct migratory strategies of Atlantic halibut within the Gulf of St. Lawrence C. Gauthier et al. 10.1093/icesjms/fsae081
- Large burial flux of modern organic carbon in the St. Lawrence estuarine system indicates a substantial atmospheric carbon sink Y. Wang et al. 10.1016/j.epsl.2025.119204
- Using chlorophyllic organic matter degradation in the deep St. Lawrence Estuary as an indicator of water column remineralization D. Lévesque et al. 10.3389/fmars.2024.1399961
- Assessing indirect biodiversity conservation benefits of fisheries closures in the Gulf of St. Lawrence, Canada A. Bryndum-Buchholz et al. 10.1371/journal.pone.0316754
- Benthic Foraminiferal Assemblages from the Laurentian Channel in the Lower Estuary and Gulf of ST. Lawrence, Eastern Canada: Tracers of Bottom-Water Hypoxia T. Audet et al. 10.2113/gsjfr.53.1.57
11 citations as recorded by crossref.
- Macrozoobenthic Diversity along an Oxygen Gradient in the Deep Trough of the Gulf of St. Lawrence (Canada) M. Zettler & F. Pollehne 10.3390/d15070854
- A high-resolution physical–biogeochemical model for marine resource applications in the northwest Atlantic (MOM6-COBALT-NWA12 v1.0) A. Ross et al. 10.5194/gmd-16-6943-2023
- Can green hydrogen production be used to mitigate ocean deoxygenation? A scenario from the Gulf of St. Lawrence D. Wallace et al. 10.1007/s11027-023-10094-1
- Mixing behaviour and sources of Ag, Pd, and other trace elements in the Estuary and Gulf of St. Lawrence under winter conditions D. Dang et al. 10.1016/j.chemosphere.2024.142935
- Deep inflow transport and dispersion in the Gulf of St. Lawrence revealed by a tracer release experiment S. Stevens et al. 10.1038/s43247-024-01505-5
- Isotopic and molecular analyses of n-alkanes in a temporal study of coastal sediment contributions to organic carbon degradation induced by algal bloom and terrestrial runoff Y. Mirzaei et al. 10.1016/j.scitotenv.2024.178071
- Living at depth: ecophysiological condition of Boreomysis arctica in autumn and winter in the St. Lawrence estuary and gulf G. Winkler et al. 10.1093/plankt/fbae022
- Otoliths as chemical archives through ontogeny reveal distinct migratory strategies of Atlantic halibut within the Gulf of St. Lawrence C. Gauthier et al. 10.1093/icesjms/fsae081
- Large burial flux of modern organic carbon in the St. Lawrence estuarine system indicates a substantial atmospheric carbon sink Y. Wang et al. 10.1016/j.epsl.2025.119204
- Using chlorophyllic organic matter degradation in the deep St. Lawrence Estuary as an indicator of water column remineralization D. Lévesque et al. 10.3389/fmars.2024.1399961
- Assessing indirect biodiversity conservation benefits of fisheries closures in the Gulf of St. Lawrence, Canada A. Bryndum-Buchholz et al. 10.1371/journal.pone.0316754
Latest update: 30 Jan 2025
Short summary
The deep waters of the lower St Lawrence Estuary and gulf have, in the last decades, experienced a strong decline in their oxygen concentration. Below 65 µmol L-1, the waters are said to be hypoxic, with dire consequences for marine life. We show that the extent of the hypoxic zone shows a seven-fold increase in the last 20 years, reaching 9400 km2 in 2021. After a stable period at ~ 65 µmol L⁻¹ from 1984 to 2019, the oxygen level also suddenly decreased to ~ 35 µmol L-1 in 2020.
The deep waters of the lower St Lawrence Estuary and gulf have, in the last decades, experienced...
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