Time-series physical and chemical transports through the Rockall Trough (2014-2018)

Rockall Trough

Alkalinity, acidity and pH of the water column; Lagrangian currents and transport rates in the water column; Phosphate concentration parameters in the water column; Temperature variation in the water column; Total dissolved inorganic carbon (TCO2) concentration in the water column; Salinity of the water column; Nitrate concentration parameters in the water column; Silicate concentration parameters in the water column; Dissolved oxygen parameters in the water column

CTD; current meters

The dataset comprises monthly-averaged transport time-series through the Rockall Trough between 15 August 2014 and 15 June 2018 for the following variables: volume, temperature, salt, nitrate, phosphate, silicate, dissolved inorganic carbon and total alkalinity. Transport fields were created from OSNAP moored CTD data and volume transport has been calculated by the OSNAP project (https://www.o-snap.org/). Calibration and analysis was carried out as follows: Moored time-series (temperature, salinity, and pressure) were calibrated using standard cal-dip protocol; Section CTD data were calibrated using bottle samples; Water samples were analysed for dissolved inorganic nutrients, dissolved inorganic carbon and total alkalinity; Multiple linear regression equations were derived using data from the AR30-04 cruise in July 2018 (R/V Armstrong, 1st-30th July 2018) - these link dissolved inorganic nutrients / dissolved inorganic carbon / total alkalinity and temperature, salinity and pressure. Multiple linear regression equations were applied to calibrated moored time-series to calculate derived time-series of dissolved inorganic nutrients, dissolved inorganic carbon and total alkalinity. Time-series were low-pass filtered to remove tidal oscillations, interpolated onto 12-hourly time-steps, and a regular pressure grid. Volume transports were calculated from moored CTD and current meter records. Nutrient and carbon transports were calculate by multiplying volume transports by derived moored nutrient and carbon fields. Temperature transports were calculated by multiplying volume transports, by interpolated moored temperature fields, and by potential density, and specific heat of seawater. Salt transports were calculated by multiplying volume transports by interpolated moored salinity fields. The dataset is a contribution to the EU-funded ATLAS project (https://www.eu-atlas.org/).

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