Abstract

Benthic flux studies conducted from February 1995 to January 1996 focused on (1) spatial and temporal consistency in benthic fluxes at key sites in Port Phillip Bay (2) benthic chamber calibration (3) bio-irrigation measurements (4) direct measurements of N2 for independent assessments of denitrification rates and efficiencies at key sites. The most important results of the study are: 1) The general pattern in nutrient fluxes observed in 1994, is repeated in the 1995 data. 2) The flux data show no sensitivity toward paddle stir rate indicating that benthic processes are insensitive to diffusive boundary layer thickness over a scale factor of two. 3) The measured N:C flux ratios for the February 1995 study, was always less than the predicted value and the missing N is interpreted to be the result of denitrification. Direct measurements by Gas Chromatography (GC) of N2 fluxes generally supported this conclusion. 4) Added nitrate was advected into the sediments. Only the naturally formed nitrate was denitrified, suggesting that there are microbial microniches in which organic carbon oxidation, ammonification, nitrification and denitrification occurs simultaneously. 5) The mass spectrometric measurements of N2 during January/December 1996 proved beyond doubt that denitrification occurs in the sediments of Port Phillip Bay. 6) There was a significant seasonal effect in the denitrification efficiencies (measured) at site 16 (Yarra Estuary) but seasonal effects on denitrification efficiencies in the central sediments (Site 37) were marginal. 7) Denitrifying efficiencies were consistently high in the central basin sediments.
Google map showing geographic bounding box with values North bound -37.8 East bound 145.1 West bound 144.3 South bound -38.4
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1996-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

22890 Product http://www.ga.gov.au/metadata-gateway/metadata/record/22890/

Keywords

GA Publication
Record
marine survey
marine
AU-VIC
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-37.8
East bound
145.1
West bound
144.3
South bound
-38.4

Lineage

Legacy product, lineage not available

Digital Transfer Options

onLine

Distributor

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

Source Description

Legacy product, source data not available.

Metadata File Identifier

a05f7892-dc10-7506-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 SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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