Data

Benthic sediment surveys of inner Darwin Harbour (GA0358) and shallow water areas in and around Bynoe Harbour (GA0359) in 2017: Chlorin measurements on seabed sediments.

Geoscience Australia
Radke, L.C. ; Tubby, J.
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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/112002&rft.title=Benthic sediment surveys of inner Darwin Harbour (GA0358) and shallow water areas in and around Bynoe Harbour (GA0359) in 2017: Chlorin measurements on seabed sediments.&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/112002&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 total chlorin and chlorin index measurements made on seabed sediments.Maintenance and Update Frequency: asNeededStatement: Bottom sediments were collected using either a Shipek grab or a Box corer. Bulk sub-samples (6.5 ml) of surface sediment (0-2 cm) were extruded into vials which were wrapped in Al foil and immediately frozen. Porosity was determined by calculation of the wet volume as a percentage of the total volume, after freeze drying and correction for seawater salts. The accuracy of the wet/dry measurements were >1%. The precision of the volume measurements were >2%. The residual sediments were then ground in the dark, and each successive sample was quickly returned to the freezer. Chlorins were then extracted from freeze-dried sediment using the method of Schubert et al. (2005). Relative standard deviations of the precisions on duplicate samples are presented with the datasets.&rft.creator=Radke, L.C. &rft.creator=Tubby, J. &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_subject=geoscientificInformation&rft_subject=marine&rft_subject=marine survey&rft_subject=marine baselines&rft_subject=continental shelf&rft_subject=seabed&rft_subject=geochemistry&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 4.0 International Licence

CC-BY

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WWW:LINK-1.0-http--link

Australian Government Security ClassificationSystem

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Contact Information

clientservices@ga.gov.au

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 total chlorin and chlorin index measurements made on seabed sediments.

Lineage

Maintenance and Update Frequency: asNeeded
Statement: Bottom sediments were collected using either a Shipek grab or a Box corer. Bulk sub-samples (6.5 ml) of surface sediment (0-2 cm) were extruded into vials which were wrapped in Al foil and immediately frozen. Porosity was determined by calculation of the wet volume as a percentage of the total volume, after freeze drying and correction for seawater salts. The accuracy of the wet/dry measurements were >1%. The precision of the volume measurements were >2%. The residual sediments were then ground in the dark, and each successive sample was quickly returned to the freezer. Chlorins were then extracted from freeze-dried sediment using the method of Schubert et al. (2005). Relative standard deviations of the precisions on duplicate samples are presented with the datasets.

Created: 08 06 2018

Issued: 02 07 2018

Data time period: 29 05 2017 to 16 06 2017

This dataset is part of a larger collection

130.96667,-12.33333 130.96667,-12.8 130.28333,-12.8 130.28333,-12.33333 130.96667,-12.33333

130.62500015,-12.566665

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

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