Data

Benthic sediment surveys of inner Darwin Harbour (GA0358) and shallow water areas in and around Bynoe Harbour (GA0359) in 2017: Core Incubation Experiments on seabed sediments

Geoscience Australia
Radke, L.C. ; Tubby, J. ; Smit, N.
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/111981&rft.title=Benthic sediment surveys of inner Darwin Harbour (GA0358) and shallow water areas in and around Bynoe Harbour (GA0359) in 2017: Core Incubation Experiments on seabed sediments&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/111981&rft.description=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.Maintenance and Update Frequency: asNeededStatement: 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.&rft.creator=Radke, L.C. &rft.creator=Tubby, J. &rft.creator=Smit, N. &rft.date=2018&rft.coverage=westlimit=130.2833333; southlimit=-12.8; eastlimit=130.966667; northlimit=-12.33333&rft.coverage=westlimit=130.2833333; southlimit=-12.8; eastlimit=130.966667; northlimit=-12.33333&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft.type=dataset&rft.language=English Access the data
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Brief description

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.

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Maintenance and Update Frequency: asNeeded
Statement: 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.

Created: 08 06 2018

Issued: 02 07 2018

Modified: 09 04 2019

Data time period: 29 05 2017 to 16 06 2017

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130.966667,-12.33333 130.966667,-12.8 130.2833333,-12.8 130.2833333,-12.33333 130.966667,-12.33333

130.62500015,-12.566665

text: westlimit=130.2833333; southlimit=-12.8; eastlimit=130.966667; northlimit=-12.33333

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Download the data (xlsx)

uri : https://d28rz98at9flks.cloudfront.net/111981/111981_Core_Incubations.xlsx

Link to collection record

uri : https://pid.geoscience.gov.au/dataset/ga/127494

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