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Chlorophyll a and Phaeophytin a data for surface seabed sediments in Jervis Bay, NSW (June and August 2008 and February 2009)

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.


Dataset citation

ANZLIC unique identifier: ANZCW0703016208

Title: Chlorophyll a and Phaeophytin a data for surface seabed sediments in Jervis Bay, NSW (June and August 2008 and February 2009)


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

Geoscience Australia carried out marine surveys in Jervis Bay (NSW) in 2007, 2008 and 2009 (GA303, GA305, GA309, GA312) to map seabed bathymetry and characterise benthic environments through colocated sampling of surface sediments (for textural and biogeochemical analysis) and infauna, observation of benthic habitats using underwater towed video and stills photography, and measurement of ocean tides and wavegenerated currents. Data and samples were acquired using the Defence Science and Technology Organisation (DSTO) Research Vessel Kimbla. Bathymetric mapping, sampling and tide/wave measurement were concentrated in a 3x5 km survey grid (named Darling Road Grid, DRG) within the southern part of the Jervis Bay, incorporating the bay entrance. Additional sampling and stills photography plus bathymetric mapping along transits was undertaken at representative habitat types outside the DRG.

This 126 sample dataset comprises chlorophyll a and pheophytin a measurements on surface seabed sediments (~0 to 2 cm) from Jervis Bay.

ANZLIC search words:

  • MARINE Surveys

Spatial domain:

locality map

Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia

Geographic extent polygon: 150.6773 -35, 150.78 -35, 150.78 -35.13, 150.6773 -35.13, 150.6773 -35,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -35 °
South bounding latitude: -35.13 °
East bounding longitude: 150.78 °
West bounding longitude: 150.6773 °

Data currency

Beginning date: 2008-06-23

Ending date: 2009-02-13


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - xls Microsoft Excel spreadsheet Excel GDA94
Available format type:
DIGITAL - xls Microsoft Excel spreadsheet Excel GDA94

Access constraints:

This material is released under the Creative Commons Attribution 3.0 Australia Licence.

Free Data Download

Data quality

Lineage:

Bottom sediments were collected using a small Shipek type grab sampler.This device can collect an intact sample of sediment up to 5 cm by 12 cm in area, and 5 cm thick. Upon triggering, the grab immediately covers the sample, preventing washout of fine sediment during retrieval to the surface. The surface 0.5 cm of sediment within the grab was sampled using a cutoff syringe.The subsample was wrapped in Al foil and immediately frozen.Chl_a concentrations in sediment extracts (90% acetone) were calculated from spectrophotometric readings at wavelengths of 664 nm and 750 nm before and after the addition of 0.1 mol/L HCl using the equation derived by Lorenzen (1967). Pheophytin a concentrations are determined as part of the process. Data are presented in ug/g, both as wet and dry weights.

Positional accuracy:

A C-NAV system was used to provide geographical position with a manufacturer accuracy of 10 cm RMS. However, the instruments may have been dragged by currents such that the readings may deviate from the GIS position.

Attribute accuracy:

Moderate. The average error was plus/minus 7% with a standard deviation of plus/minus 5%.

Logical Consistency:

The same data acquisition procedures and laboratory processing were used for the three surveys that contributed to this dataset.

Completeness:

completed


Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address: sales@ga.gov.au

Metadata information

Metadata date: 2013-03-08


Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703016208.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703016208.xml

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Authors:Radke, L.
SPATIAL INFORMATION FOR THE NATION