IMOS - Deep Water Moorings - Southern Ocean Time Series (SOTS) - all delayed-mode data

This collection consists of observations from the deep-water moorings at the Southern Ocean Time Series (SOTS) site in the sub-Antarctic Zone (SAZ), southwest of Tasmania, near 47S, 142E. The moorings are 1) the Pulse biogeochemistry mooring (instrumentation was moved to the FluxPulse mooring in 2016, and then to the SOFS mooring); 2) the Sub-Antarctic Zone (SAZ) sediment trap mooring; and 3) the Southern Ocean Flux Station (SOFS) (the instrumentation was briefly moved to the FluxPulse mooring in 2016). All three are operated by the Australian Bluewater Observing System. Data are processed in delayed mode and available in NetCDF format. The Southern Ocean Time Series (SOTS) sub-facility provides high temporal resolution observations in sub-Antarctic waters. Observations are broad and include measurements of physical, chemical and biogeochemical parameters from multiple deep-water moorings. The emphasis is on inter-annual variations of upper ocean properties and their influence on exchange with the deep ocean. The time-series provided permit investigation into issues of ocean physics and chemistry, climate change, carbon cycling and biogeochemical controls on marine productivity. The Pulse biogeochemistry mooring is used to measure upper ocean carbon cycle and phytoplankton productivity processes. Measured parameters include temperature, salinity, dissolved oxygen, nitrate, clorophyll and turbidity. This mooring also collects water samples for measures of dissolved carbon and nutrients, and phytoplankton microscopic identification. The SAZ sediment trap mooring is used to collect sinking particles to quantify carbon transports, and provides current meter measurements and a deep ocean CTD to measure heat contents below the depth of Argo profiling float measurements. The SOFS mooring has dual sets of radiometers, temperature and humidity sensors, precipitation gauges and sonic anemometers, providing the measurements necessary for computing air-sea fluxes of heat, momentum and mass. Surface photosynthetically active radiation and surface UV are also measured, to help assess light available for phytoplankton production.