Data Trawler - Project details

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Project details

Title: Sub-bottom profiling of the South-East Queensland Bulge
Id: 2605
Investigator(s): Helen Bostock
University of Queensland [details]

Description: In this project, we will collect a series of Sub-bottom Profiles (SBP) over the south-east Queensland “bulge” area to identify possible future coring spots. The SBP mapping of the area would aim to clearly identify regions for future coring, with an aim to target a region with deep sediment layers.
Years: 2022


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List of surveys that this project was on.

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Survey InvestigatorDescription

Chris Chapman This voyage will recover an array of six full-depth current meter and property (temperature, salinity and pressure) moorings from the continental slope to the abyssal waters off Brisbane (27oS). The observing system is designed to capture the mean and time-varying flow of the EAC. We will undertake biological and oceanographic sampling, using CTDs, Triaxus tows, SADCP, to characterise the shelf waters off the Stradbroke NRS, and to sample dynamic, ephemeral frontal eddies flowing down from Fraser Island and shelf – boundary exchanges. These observations will enable us to discover the spatial and temporal variability of shelf water and plankton around the Stradbroke Island National Reference Station (NRS) mooring (Canyon monitoring). The data from the EAC mooring array and other oceanographic sampling are essential for understanding, at the regional to global scale, the role of boundary current in the climate system, and, at the local scale, simulating cross-shelf flows, upwelling, and frontal eddy formation. These local-scale processes have a fundamental impact on nutrient and phytoplankton concentrations and therefore far-reaching effects on annual fisheries productivity and coastal shark interactions along the eastern seaboard. We will undertake CTD/02 and nutrient samples, numerous Triaxus and ship ADCP sections across the EAC mooring line and across the shelf-EAC. These surveys will includeTriaxus/SADCP lines in the area between 28oS and 26oS. These operations will occur in between the mooring operations and at the completion of the mooring operations. We will deploy 2 Standard Argo floats during the voyage. Should time allow, we will conduct hydrographic survey of a “superproductive” Richmond submarine canyon between the Gold Coast and Byron Bay. We will undertake a long sub-bottom profiler section in this region in order to identify future coring sites for paleoclimate studies. We will use the 36-bottle rosette with the lowered ADCPs (150 kHz and 300 kHz) attached. We will collect salinity and oxygen samples for calibration of the CTD salinity and oxygen sensors, as well as for calibration and quality control of recovered mooring instruments. We will also collect nutrient (silicate, phosphate and nitrate) and carbon samples. Although we use the 36 bottle rosette, only 18 niskin bottles will be required. Removing one in two bottles will enable us to fix brackets for the post-recovery “dips’ of recovered instruments (as in previous mooring voyage IN2021_V03).
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