Data Trawler - Project details

Please login if you have access to particular applications.

Project details

Title: Acoustic zooplankton and fish
Id: 2506
Investigator(s): Rudy Kloser
CSIRO Oceans & Atmosphere - Hobart [details]

Description: 1. With vessel stationary, deploy PLAOS acoustic-optical profiling device to 1000m depth, 2 times per night for up to 5 nights. Each cast takes ~1.5 hours. Protocols have been developed for the PLAOS operations on previous trials and operational voyages. The deployments need to commence at night at least 1 hour after sunset and finish at least 1 hours before sunrise. Deploy the PLAOS during the day for 1 -2 casts to characterise the vertical flux of organisms to assist with zooplankton grazing experiments. 2.Operate the ships underway bio-acoustic sensors during the voyage to characterise the epipelagic and mesopelagic scattering (IMOS bioacoustics). Trials of broadband acoustics from the vessels transducers and CTD casts to 1000 m will also be done on an opportunistic basis. Test the reduction in noise on the acoustic systems from previous voyage recommendations. 3.Capture key zooplankton/micronekton organisms using a single wire ISAAC Kid (or RMT25) trawl towed obliquely to 600 m depth and a 1 m surface net for species identification, isotope and acoustic reflectance studies. Three to five night time tows and two day time tows are envisaged (~3 hrs per operation).
Years: 2018

List of surveys that this project was on.

Use [details] link to view survey details (map, reports, metadata etc) including links to download data.

Survey InvestigatorDescription

Thomas W. Trull Integrated Monitoring Observing System Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania (Chief Scientist: Professor Tom Trull, ACE-CRC) The Southern Ocean Time Series provides world-leading automated observations from deep-ocean moorings of the exchanges of heat, water, carbon dioxide, and oxygen between the ocean and atmosphere, and the physical and biological processes that control them. These results contribute to forward projections of anthropogenic climate warming, inform the setting of emissions targets, illuminate controls on climate variability, and provide a baseline for impacts on ocean pelagic ecology. Sensor data is returned live to the internet and samples are returned annually for further study in shore laboratories. Subantarctic Biogeochemistry of Carbon and Iron, Southern Ocean Time Series site (Lead Principal Investigator: Professor Philip Boyd, UTAS) The Southern Ocean straddles the waters between Australia and Antarctica and has two distinct regions – the subantarctic and the polar seas. The latter is comprehensively studied by expeditions by Australia’s Antarctic Division, whereas the subantarctic has received much less attention. This voyage aims to determine processes within the subantarctic environment that control productivity, foodwebs and cycles of elements such as carbon. Enhanced understanding will maximise investments, such as in ocean time-series in subpolar waters and enable better predictions to be made on how marine life and chemistry are controlled by both natural and human-made shifts in climate and ocean conditions.
NCMI Information and Data Centre  »  Applications  »  Data Trawler