Articles | Volume 17, issue 5
https://doi.org/10.5194/os-17-1509-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-17-1509-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Oct 2021
Research article |
| 28 Oct 2021
| 28 Oct 2021
Winter observations alter the seasonal perspectives of the nutrient transport pathways into the lower St. Lawrence Estuary
Cynthia Evelyn Bluteau
CORRESPONDING AUTHOR
Institut des sciences de la mer, Université du Québec à Rimouski, Rimouski, Canada
Peter S. Galbraith
Institut Maurice-Lamontagne, Fisheries and Oceans Canada, Mont-Joli, Canada
Daniel Bourgault
Institut des sciences de la mer, Université du Québec à Rimouski, Rimouski, Canada
Vincent Villeneuve
Département de biologie, Université Laval, Québec, Canada
Jean-Éric Tremblay
Département de biologie, Université Laval, Québec, Canada
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The MALINA oceanographic expedition was conducted in the Mackenzie River and the Beaufort Sea systems. The sampling was performed across seven shelf–basin transects to capture the meridional gradient between the estuary and the open ocean. The main goal of this research program was to better understand how processes such as primary production are influencing the fate of organic matter originating from the surrounding terrestrial landscape during its transition toward the Arctic Ocean.
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Short summary
In 2018, the Canadian Coast Guard approved a science team to sample in tandem with its ice-breaking and ship escorting operations. This collaboration provided the first mixing observations during winter that covered the largest spatial extent of the St. Lawrence Estuary and the Gulf of St. Lawrence ever measured in any season. Contrary to previous assumptions, we demonstrate that fluvial nitrate inputs from upstream (i.e., Great Lakes) are the most significant source of nitrate in the estuary.
In 2018, the Canadian Coast Guard approved a science team to sample in tandem with its...
