Western Channel Observatory (E1) nutrient concentration profiles (2002 - 2017)

Link to the related European Directory of Marine Environmental Data (EDMED) record Results are reported for the analysis of water samples taken from the E1 longterm sampling station (50 02.0' N;04 22.0 'W) situated off the southwest coast of England, United Kingdom. Data consists of results for samples that are both filtered and unfiltered. The analyses are reported for Nitrate+Nitrite, Nitrite, Silicate and Phosphate concentrations. The dataset begins in 2002 and runs through till 2017, though the data is an ongoing time series. Since 2007 the site visits have been on a more regular almost fortnightly sampling protocol, however due to the more 'offshore' nature of the site there are many sampling weeks lost due to bad weather. A classical picture is seen of generally summer nutrient depletion and with higher winter concentrations of Nitrate, Silicate and Phosphate. Temporal coverage 26 June 2002 - 19 December 201

AMT25 (JR15001) micro-molar nutrient measurements from CTD bottle samples.

This dataset consists of 1148 measurements of micromolar nutrient concentrations made on samples collected during the Atlantic Meridional Transect programme cruise 25 (AMT25 JR15001) between 18th September and 2nd November 2015. The cruise track between UK and Chile passed through both north and south Atlantic gyres. This dataset contributes to the AMT time-series of core oceanographic measurements along a north-south transect of the Atlantic Ocean. Samples were collected on a daily basis at 10 to 18 depths, usually in the upper 500m but up to 5000m, using a CTD rosette with 24 x 20 L OTE (Ocean Test Equipment) bottles. Samples were analysed within 3-4 hours of collection for nitrate+nitrite, nitrite, phosphate and silicate using a 5-channel Bran and Luebbe AAIII segmented flow, colourimetric, auto-analyser (Brewer and Riley (1965) for nitrate, Grasshoff (1976) for nitrite, Kirkwood (1989) and Mantoura and Woodward (1983) for phosphate and silicate). Established, proven analytical protocols were used