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. New production, i.e. that driven by allochthonous nutrient inputs, is theonly form of primary production that can lead to net increases in organicmaterial and is, therefore, important for understanding energy flow in marineecosystems. The spatial distribution of new production is generally, however,not well known. Using data collected in July 2016, we analyse the potentialfor vertical mixing to support new production in the upper layers of thenortheastern portion of the North Sea. Relatively large (up to >0.5  mmol N m −2  d −1 ) nitrate fluxes due to turbulent verticalmixing into the euphotic zone were found at some stations over the shelfedge, while low values (  mmol N m −2  d −1 ) were found inthe deeper open area north of the shelf edge. The low vertical mixing rates(dissipation rates of turbulent kinetic energy below 10 −8  W kg −1 ,corresponding to vertical turbulent diffusion coefficients of10 −6 –10 −5  m 2  s −1 ) implied f ratios of in the open watersnorth of the shelf edge. In the shallow (  m) southern and central partof the study area, inorganic nutrients were low and nitrate undetectable,suggesting negligible new production here, despite relatively highconcentrations of chlorophyll  a being found in the bottom layer. Thus, highrates of new production seem to be concentrated around the shelf-edge zoneand in association with localized features exhibiting enhanced verticalmixing. We find that the nutricline depth is significantly deeper at theshelf edge and interference with increased mixing in this deeper depth rangecan explain the increased diapycnal nitrate fluxes. Overall, this suggeststhat the shelf-edge zone may be the major nutrient supplier to the euphoticzone in this area during the period of summer stratification.

Turbulence measurements suggest high rates of new production over the shelf edge in the northeastern North Sea during summer