Articles | Volume 20, issue 2
https://doi.org/10.5194/os-20-293-2024
https://doi.org/10.5194/os-20-293-2024
Research article
 | 
14 Mar 2024
Research article |  | 14 Mar 2024

Fjord circulation permits a persistent subsurface water mass in a long, deep mid-latitude inlet

Laura Bianucci, Jennifer M. Jackson, Susan E. Allen, Maxim V. Krassovski, Ian J. W. Giesbrecht, and Wendy C. Callendar

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Cited articles

Aksnes, D. L., Aure, J., Johansen, P.-O., Johnsen, G. H., and Vea Salvanes, A. G.: Multi-decadal warming of Atlantic water and associated decline of dissolved oxygen in a deep fjord, Estuar. Coast. Shelf Sci., 228, 106392, https://doi.org/10.1016/j.ecss.2019.106392, 2019. 
Kung, R.: Canada west coast topo-bathymetric digital elevation model, Natural Resources Canada [data set], https://open.canada.ca/data/en/dataset/e6e11b99-f0cc-44f7-f5eb-3b995fb1637e (last access: 7 July 2021), 2021. 
Arimitsu, M. L., Piatt, J. F., Madison, E. N., Conaway, J. S., and Hillgruber, N.: Oceanographic gradients and seabird prey community dynamics in glacial fjords: Glacial fjord marine habitat, Fish. Oceanogr., 21, 148–169, https://doi.org/10.1111/j.1365-2419.2012.00616.x, 2012. 
Bailey, L. P., Clare, M. A., Pope, E. L., Haigh, I. D., Cartigny, M. J. B., Talling, P. J., Lintern, D. G., Hage, S., and Heijnen, M.: Predicting turbidity current activity offshore from meltwater-fed river deltas, Earth Planet. Sc. Lett., 604, 117977, https://doi.org/10.1016/j.epsl.2022.117977, 2023. 
Baker, P. and Pond, S.: The Low-Frequency Residual Circulation in Knight Inlet, British Columbia, J. Phys. Oceanogr., 25, 747–763, https://doi.org/10.1175/1520-0485(1995)025<0747:TLFRCI>2.0.CO;2, 1995. 
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While the deeper waters in the coastal ocean show signs of climate-change-induced warming and deoxygenation, some fjords can keep cool and oxygenated waters in the subsurface. We use a model to investigate how these subsurface waters created during winter can linger all summer in Bute Inlet, Canada. We found two main mechanisms that make this fjord retentive: the typical slow subsurface circulation in such a deep, long fjord and the further speed reduction when the cold waters are present.