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 data set comprises TCO2 flux and pool data for surface seabed sediments (~0 to 2 cm).
Google map showing geographic bounding box with values North bound -35.0 East bound 150.78 West bound 150.67725 South bound -35.13
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please contact Geoscience Australia Client Services via:

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+61 2 6249 9960; or
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Product Type/Sub Type

dataset - Marine Data - Bathymetry Grid

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2011

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

Marine Data
Bathymetry Grid
marine
geochemistry
abiotic surrogates
Marine Geoscience

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-35.0
East bound
150.78
West bound
150.67725
South bound
-35.13

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, which prevents washout of fine sediment during retrieval to the surface. Immediately after the grab was back aboard, the surface sediments were spooned into two 58 ml falcon vials for the vial incubation experiments. No later than 4 hours after collection, the porewaters from one of the two falcon vials (time = zero (t0)) were extracted by centrifugation (8890 rpm; 5 minutes) and syringefiltered (0.45 um) into 3 ml containers that had been precharged with 0.025 ml of mercuric chloride. Approximately 24 hours later, the second of the two falcon vials from each site (time = one (t1)) were sampled by the same method. The porewater extracts were stored in the refrigerator prior to analysis for TCO2 concentrations.These concentrations were measured at Geoscience Australia using an AS_C3 DIC analyser (Apollo SciTech), with a certified reference material as a standard.The TCO2 flux measurements represent the amount of CO2 produced by incubating sediment over a ~24 hour period, normalised to the volume of sediment used in the incubation. The TCO2 pool measurements constitute the TCO2 concentrations of the t=0 sample corrected for the TCO2 efflux during the period (up to 4 hours) prior to centrifugation, and normalised to the volume of incubating sediment.

Digital Transfer Options

onLine

DISTRIBUTION Format

xls

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a529430e-217d-0f20-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2014-02-14

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact Geoscience Australia Client Services via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).