Data Trawler - Project details

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Project details

Title: Bongo net system trials
Id: 2621
Acronym: Bongo trials
Investigator(s): Phil De Boer
CSIRO National Collections and Marine Infrastructure [details]

Description: Bongo net system trials will be conducted in shallow protected waters and deeper Southern Ocean waters. These will be carried out with deployment over the stern Via the A-frame attached to the towed body wire. The towed body wire and Bongo net system will be ready to go on departure of pw4, with the Bongo net as first deployment then the towed body wire could be disconnected and then reconnected onto TRIAXUS whilst other tests are carried out.
Years: 2021
Hierachy: Marine National Facility - Field Operations

List of surveys that this project was on.

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Survey InvestigatorDescription

Dr Shadwick (ACE CRC) The Southern Ocean has a predominant role in the movement of heat and carbon dioxide into the ocean interior moderating Earth’s average surface climate. The IMOS SOTS sub-facility uses a set of two automated moorings to measure these processes under extreme conditions, where they are most intense and have been least studied. The atmosphere-ocean exchanges occur on many timescales, from daily insolation cycles to ocean basin decadal oscillations and thus high frequency observations sustained over many years are required. The current context of anthropogenic forcing of rapid climate change adds urgency to the work. The primary objective is to first deploy a new set of SOTS moorings (SOFS-9 and SAZ-22) and then recover the existing SOTS moorings (SOFS-8 and SAZ-21). Each of the SOTS moorings delivers to specific aspects of the atmosphere-ocean exchanges: • the SAZ sediment trap mooring collects samples to quantify the transfer of carbon and other nutrients to the ocean interior by sinking particles and investigate their ecological controls. • the Southern Ocean Flux Station (SOFS) mooring measures meteorological and ocean properties important to air-sea exchanges, ocean stratification, waves, currents and biological productivity and ecosystem structure. Water samples are collected for more detailed nutrient and plankton investigations after recovery. Ancillary work will obtain supporting information on atmospheric and oceanographic conditions using CTD casts, underway measurements, Triaxus towed body, Continuous Plankton Recorder and autonomous profiling Biogeochemical-Argo floats, and potentially casts of a bio-optical sensor package.
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