Authors / CoAuthors
Radke, L.C. | Tubby, J. | Smit, N.
Abstract
Benthic sediment sampling of Inner Darwin Harbour (GA0358) and shallow water areas in and around Bynoe Harbour (GA0359) was undertaken between May 29 and June 19, 2017. Partners involved in the surveys 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)). These surveys form 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. This dataset comprises area-based rates of total carbon dioxide production and oxygen uptake in marine sediments.
Product Type
dataset
eCat Id
111981
Contact for the resource
Point of contact
Text
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Digital Object Identifier
Keywords
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- marine
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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
- ( Product )
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- Published_External
Publication Date
2018-07-02T01:20:26
Creation Date
2018-06-08T00:00:00
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
asNeeded
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 blank samples (filtered uv-treated seawater) run in intermittently and in duplicate (including the start and end of the field campaign) are reported with the data.
Parent Information
Extents
[-12.8, -12.33333, 130.2833333, 130.966667]
Reference System
Spatial Resolution
GPS 2-5 m
Service Information
Associations
Source Information