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Conductivity-Temperature-Depth (CTD) profile data from shallow and deep ocean moorings deployed on multiple marine cruises investigating krill abundance variability around South Georgia, 2002-2006


Conductivity-Temperature-Depth (CTD) data from shallow (300m) and deep (1300m) moorings in the Southern Ocean collected between Oct 2002 and Jan 2006. The CTD measured the conductivity of the water (equating to salinity), together with the water temperature and the depth of the buoy.

Data were collected by deployment of sub-surface moorings equipped with physical and biological sensor systems. The main buoys with the sensor systems were designed to float 200m below the water surface, to minimise the impact of icebergs while giving good sample coverage for the upper water column. The acoustic instruments were oriented upwards towards the surface and each mooring had 3 monitoring systems on-board: 1) a water column profiler (WCP), 2) an Acoustic Doppler Current Profiler (ADCP) and 3) a Conductivity/ Temperature/ Depth (CTD) analyser.

This work took place as part of a project to: a) quantify the magnitude and timing of short-term, ecologically-significant, intra-annual variability in krill abundance at South Georgia; b) describe the effect of oceanic tides at the two locations; c) test the hypothesis that krill immigration to, and hence abundance at, South Georgia is mediated by influx of cold waters; and d) determine functional responses of predators to short term variations in prey (krill) abundance. Antarctic krill (Euphausia superba) is of vital importance to the South Georgia marine ecosystem providing food for a high proportion of Antarctic wildlife, and is eaten by most animals (seals, whales, birds, fish, squid, penguins).

mooring, physical sensor, upper water column

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