CTD (Conductivity, Temperature and Depth) ESM2 profile data for the POSEIDON project in the Celtic Seas and English Channel for autumn 2012 to 2016

ESM2 CTD (Conductivity, Temperature and Depth) profile data for CEND20_13, CEND20_14, CEND22_15, CEND22_16, part of the annual autumn pelagic survey in the English Channel, Celtic Sea and Bristol Channel running from 2012-2016. ESM2 is a Cefas developed micro logger for applications requiring a small low power logger with integrated sensors and battery. It has standard sensors for conductivity, temperature, depth, optical backscatter and roll and pitch, and was also fitted with an oxygen optode, sea point fluorometer and light profiler.