Source: Journal of Geophysical Research: Oceans
Although recent studies report that the Northwestern Atlantic Shelf is the fastest warming region of the ocean, detailed mechanisms of the warming have been unclear. By releasing numerous passive particles on the density surfaces in the Labrador Current (reproduced by an eddy resolving ocean model), Neto et al.  found that warm core rings emanating from the Gulf Stream prevent the Labrador Current from penetrating westward onto the Northwestern Atlantic Shelf, causing the warming. Long-term analyses further revealed that this blockage has been seen more frequently since 2008, leading to a rapid warming of the shelf waters.
Lesser penetration of the Labrador Current may have implications for weakening of the large-scale ocean circulations, known as the Atlantic Meridional Overturning Circulation. Further, the warming caused by blocking the Labrador Current may cause marine heat waves and drastically change the local environment, challenging the ecosystem and fisheries management.
Citation: Neto, A. G., Palter, J. B., Xu, X., & Fratantoni, P. (2023). Temporal variability of the Labrador Current pathways around the Tail of the Grand Banks at intermediate depths in a high-resolution ocean circulation model. Journal of Geophysical Research: Oceans, 128, e2022JC018756. https://doi.org/10.1029/2022JC018756
—Takeyoshi Nagai, Editor, JGR: Oceans