Authors / CoAuthors
Radke, L.C. | Tubby, J. | Carey, M. | Atkinson, I.
Abstract
A benthic sediment sampling survey (GA0356) to the nearshore areas of outer Darwin Harbour was undertaken in the period from 03 July to 14 September 2016. Partners involved in the survey included Geoscience Australia (GA), the Australian Institute of Marine Science (AIMS) and the Department of Environment and Natural Resources within the Northern Territory Government (NT DENR) (formerly the Department of Land and Resource Management (DLRM)). This survey forms part of a four year (2014-2018) science program aimed at improving knowledge about the marine environments in the regions around Darwin and Bynoe Harbour’s through the collection and collation of baseline data that will enable the creation of thematic habitat maps to underpin marine resource management decisions. This project is being led by the Northern Territory Government and is supported by the INPEX-led Ichthys LNG Project, in collaboration with - and co-investment from GA and AIMS. The program builds upon an NT Government project (2011-2011) which saw the collection of baseline data (multibeam echosounder data, sediment samples and video transects) from inner Darwin Harbour. This dataset comprises total oxygen uptake and total carbon dioxide flux measurements from core incubation experiments on seabed sediments. Radke, L., Smit, N., Li, J., Nicholas, T., Picard, K. 2017. Outer Darwin Harbour Shallow Water Sediment Survey 2016: GA0356 – Post-survey report. Record 2017/06. Geoscience Australia, Canberra. http://dx.doi.org/10.11636/Record.2017.006 This research was funded by the INPEX-led Ichthys LNG Project via the Northern Territory (NT) Government Department of Land Resource Management (DLRM) (now the Department of Environment and Natural Resources (DENR)), and co-investment from Geoscience Australia (GA) and Australian Institute of Marine Science (AIMS). We are grateful to the following agencies for providing boats and staff, and to the following personal for help with sample acquisition: NT DENR (Danny Low Choy and Rachel Groome), NT Fisheries (Wayne Baldwin, Quentin Allsop, Shane Penny, Chris Errily, Sean Fitzpatrick and Mark Grubert), NT Parks and Wildlife (Ray Chatto, Stewart Weorle, and Luke McLaren) and the Larrakia Rangers (Nelson Tinoco, Kyle Lewfat, Alan Mummery and Steven Dawson). Special thanks to the skippers Danny Low Choy, Wayne Baldwin, Stewart Weorle and Luke McLaren whose seamanship strongly guided the execution of this survey. AIMS generously allowed use of the aquarium and laboratory at the Arafura Timor Sea Research Facility, and Simon Harries and Kirsty McAllister helped with the setup. We would also like to acknowledge and thank GA colleagues including: Matt Carey, Ian Atkinson and Craig Wintle (Engineering and Applied Scientific Services) for the organisation of field supplies and the design of the new core incubation set-up. This dataset is published with the permission of the CEO, Geoscience Australia
Product Type
dataset
eCat Id
108009
Contact for the resource
Author
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Digital Object Identifier
Keywords
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- Marine survey
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- Marine Baselines
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- Continental shelf
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- Seabed
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- Geochemistry
- Australian and New Zealand Standard Research Classification: Fields of Research
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- Earth Sciences
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- Published_External
Publication Date
2017-08-09T14:00:00
Creation Date
2017-08-09T11:00:00
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Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
Bottom sediments were collected using a Shipek Grab or Box Core. One 5 cm diameter core of surface sediment was extracted from the grabs/boxcores by hand-pushing a 5 cm diameter core barrel into the sediments. The cores were overlain with 0.153 L of filtered (2 um) and uv-treated seawater, sealed and then were incubated in the dark for ~4-6 hours at ~25oC after a ~3 hour pre-incubation period (in which the cores remained open to exchange water with the incubator). Dissolved oxygen levels were measured at ~30 minute intervals using the Presens technology. Samples for dissolved inorganic carbon (DIC) analyses were taken at the start and finish of each incubation experiment. DIC concentrations were determined using a DIC analyser and infrared-based CO2 detector (at Geoscience Australia). CO2 production and O2 consumption rates were calculated by concentration differences (T=1 - T=0) over the course of the incubation. Accuracy of O2 measurements was ± 0.1 mg L-1. The O2 consumption and CO2 production rates of the 4 blank samples (filtered uv-treated seawater) run in intermittently and in duplicate (including the start and end of the field campaign), were -2.4 ± 2.7 and -0.2 ± 1.1 mmol m-2 d-1 respectively.
Parent Information
Extents
[-12.740464, -12.13859, 130.637289, 131.132551]
Reference System
Spatial Resolution
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