Data Trawler - Project details

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Project details

Title: Bio Argo float deployment in the Great Australian Bight
Id: 2517
Investigator(s): Nick Hardman-Mountford
CSIRO Oceans & Atmosphere - IOMRC Crawley [details]

Description: Our objective is to deploy two (2) Bio-Argo profiling floats and two (2) Argo floats to provide autonomous measurements of bio-optical and biogeochemical properties of the GAB for improving satellite remote sensing estimates of productivity and characterising the biogeochemistry of the region.
Years: 2017

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

Dr Asrar Talukder (CSIRO) The voyage objectives are built around three main scientific objectives: * The benthic characterisation and sampling outcropping sedimentary rocks to aid understanding of modern seabed erosional mechanisms, sedimentary processes and paleoenvironmental reconstruction. * Benthic characterisation and sampling in areas of potential seepage to determine if fluid escape is occurring and the nature of the fluids and their relationship to the benthic fauna in these areas. * Sampling of benthic fauna over a large geographic area to establish deep water community structure and function and augment understandings gained from recent IN2015_C01 and IN2015_C02 voyages. Benthic characterisation of outcrop rocks and sampling of benthic fauna carry higher weight than that of the seep characterisation. The voyage plan includes more planned operations in each target area than can be achieved within the time allocations for the survey. Each of these target areas are ranked based on their importance in delivering on the scientific objectives. The survey will use a hierarchical design comprising seafloor mapping prior to seafloor sampling and limited water column characterisation. Seafloor mapping and water column characterisation 1. Hull mounted acoustic characterisation of the water column and seafloor over the target areas of interest. This activity will comprise the use of MBES, water column acoustic backscatter, single beam echo sounder, sub-bottom profiler and ADCP to determine processes occurring in the water column and map the seafloor and shallow subsurface geology. 2. Seafloor characterisation from the surface will be complemented with a limited number of tow camera to obtain video transects across the target area seafloor and overlying near bottom waters. Seafloor and water column sampling A number of sampling operations will be undertaken to describe the seafloor geology and benthic biota. Each sampling operation will differ dependant on sampling target, primarily based on substrate composition. For the soft substrate targets there will be a focus on grab samples whilst for the harder substrate types the focus will be on dredging. Sampling will be by: 1. Deployment of grab sampler to sample the surface sediment infauna, microbiology, hydrocarbon chemistry and physical properties. 2. Use of a beam trawl or Sherman sled to collect samples of benthic macro fauna over target areas. 3. Use of rock dredges to collects lithified sediments for description and detailed chemical analysis. 4. Limited collections of water column profile data including CTD, chemical sensor readings and associated water samples
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