About this Research Topic
The strong atmospheric jet stream traversing subpolar waters induces cooling and deep water formation and this fuels a huge volume of water with nutrients - every winter. These drivers control the subpolar gyre - a large body of cold and low-saline subarctic water, which circulates counterclockwise south of Iceland and Greenland. These processes are intrinsically linked to the Atlantic Meridional Overturning Circulation (AMOC) - a principal driver of the Earth’s climate system.
A growing body of literature has illustrated how the size and circulation intensity of the subpolar gyre regulates e.g. temperature, salinity, nutrient and phytoplankton concentration, abundances of key zooplankton species, stock size, spawning distribution and feeding migration route of pelagic fish stocks (blue whiting, mackerel and herring), biomass of demersal fish stocks, breeding success of seabirds and the annual number of pilot whales beached in the Faroe Islands back several centuries.
Studies have furthermore revealed that temperatures in the subpolar North Atlantic - and thus the strong ocean dynamics which drive changes in this key parameter – is potentially predictable, with a time horizon of 1-3 years. This underscores that improving our understanding of the clear bio-physical couplings in these waters might result in socio-economic benefits.
Large-scale indices (e.g. the gyre index) have been used to collectively discuss key trends in several components of this vast pelagic complex. In addition, it has become evident that the adjacent shelf ecosystems should not be studied separately, but rather integrated into a larger perspective, which includes the oceanic waters connecting these shelves. Marked ecosystem variability reverberates in the national economies of fishery-dependent societies in the northeastern Atlantic. Since the northeastern Atlantic is ‘the cradle’ of physical oceanography, this region also provides many of the longest physical and biological records available.
Emerging evidence shows that the Norwegian Sea gyre impacts the Nordic Seas in a similar way as the subpolar gyre influences the North Atlantic.
This multidisciplinary Research Topic will bring together research articles under themes related to physical drivers of biogeographical shifts in the northeastern Atlantic and adjacent shelves, e.g.:
• Oceanic and shelf systems separately and/or the interplay between these domains
• Single species or multi-species (food chain) interactions
• Novel methods and approaches for characterizing ocean-shelf biogeography
• Mini-reviews highlighting key knowledge gaps in our current understanding of physical drivers of biogeography and ocean-shelf dynamics
• Natural climate variability and/or future climate change
• Potential socio-economic impacts
Keywords: climate variability, ecosystem variability, northeastern Atlantic, predictability, ocean-shelf interaction
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