Hydrographic section data (dissolved inorganic nutrients, dissolved inorganic carbon and total alkalinity) from AR30-04 from the Eastern Boundary array (Rockall Trough), as part of UK OSNAP (Overturning in the Subpolar North Atlantic Programme).

The dataset consists of water samples collected in the Rockall Trough along the Extended Ellett Line using the lowered rosette during cruise AR30-04 in July 2018. Samples were analysed for dissolved inorganic carbon, total alkalinity, nitrite+nitrate, phosphate, and silicate. The cruise took place under UK OSNAP (NE/K010875/1 and NE/K010875/2) and UK National Capability CLASS (NE/R015953/1). Sample analysis was funded by the European Union's Horizon 2020 Research and Innovation Programme under grant agreement no. 678760 (ATLAS).