Nutrient concentration profiles from long term time series at Station L4 in the Western English Channel from 2000 to 2014.

Results are reported for the analysis of water samples taken from the L4 long-term sampling station (50 degrees 02.6'N; 4 degrees 22.5W) situated off the south-west coast of England, United Kingdom. The analyses are reported for Nitrate+Nitrite, Nitrite, Silicate and Phosphate concentrations. The data set begins in 2000 and since 2007 has been on a more regular almost weekly sampling protocol. A classical picture is seen of generally summer nutrient depletion and with higher winter of the Nitrate, Silicate and Phosphate, however particularly in wet summers like 2012 there is a big influence of the River Tamar and spikes of high nutrient loads are seen being introduced into this near-shore sampling site.