Weakening and warming of the European Slope Current since the late 1990s attributed to basin-scale density changes

Abstract

Abstract. Oceanic influences on shelf seas are mediated by flow along and across continental slopes, with consequences for regional hydrography and ecosystems. Here we present evidence for the variable North Atlantic influence on European shelf seas over the last 4 decades using ocean analysis and reanalysis products, as well as an eddy-resolving ocean model hindcast. To first order, flows oriented along isobaths at the continental slope are related to the poleward increase in density in the adjacent deep ocean that supports a geostrophic inflow towards the slope. In the North Atlantic, this density gradient and associated inflow have undergone substantial, sometimes abrupt, changes in recent decades. Inflow in the range 10–15 Sv is identified with eastward transport in temperature classes at 30∘ W in the latitude range 45–60∘ N. Associated with major subpolar warming around 1997, a cool and fresh branch of the Atlantic inflow was substantially reduced, while a warm and more saline inflow branch strengthened, with respective changes of the order of 5 Sv. Total inflow fell from ∼ 15 Sv pre-1997 to ∼ 10 Sv post-1997. In the model hindcast, particle tracking is used to trace the origins of poleward flows along the continental slope to the west of Ireland and Scotland before and after 1997. Backtracking particles up to 4 years, a range of subtropical and subpolar pathways is identified from a statistical perspective. In broad terms, cold, fresh waters of subpolar provenance were replaced by warm, saline waters of subtropical provenance. These changes have major implications for the downstream shelf regions that are strongly influenced by Atlantic inflow, in particular the northern North Sea, where “subtropicalization” of ecosystems has already been observed since the late 1990s.

The Role of Deep Winter Mixing and Wind‐Driven Surface Ekman Transport in Supplying Oceanic Nitrate to a Temperate Shelf Sea

“…The cross‐shelf transport regimes suggest that interannual variability of the winter oceanic nitrate supply to the shelf depends not only on the strength/direction of winter winds, but also the deepest winter mixing and the vertical nitrate distributions in the ocean nitrate pools near the shelf edge. Therefore, future changes in winter atmospheric and ocean conditions (e.g., winds, storms, subsurface temperature, water masses) due to, for example, a poleward shift in the North Atlantic eddy‐driven jet stream (Woollings & Blackburn, 2012) and/or changes in the strength and position of the Subpolar Gyre (Clark et al., 2022), could modulate the importance of winter oceanic nitrate supply to spring bloom in shelf seas.…”