Nella Dan: FIBEX Cruise - Hydroacoustic krill survey data

This dataset contains hydroacoustic results from the First International Biomass Experiment (FIBEX) cruise of the Nella Dan. This cruise is the first in a series of six cruises, performing a long term survey of krill and other zooplankton distribution and abundance. FIBEX was an international project, done in co-operation with Japan, South Africa and France. Fourteen transects were made by Australia off Antarctica in the Australian sector (Mawson to Davis region) and Prydz Bay in January to March 1981, covering a survey area of 1.09x10^6 square kilometers. Quantitative and geographic krill distribution, abundance, mean and variance of the krill weight density, and total krill biomass were obtained. The standing stock of krill for the Prydz Bay region was calculated at the second workshop to be approximately 1.3 million tonnes, or 1.6 million tonnes if extrapolated over the survey area of the SIBEX II cruise. Temperature, nutrient and salinty data were also obtained, as well as trawl results. Summary results are listed in the documentation.

A scanned copy of the acoustics log book from the voyage is available for download from the provided URL.

Identification info

Alternate title: Nella Dan: FIBEX Cruise - Hydroacoustic krill survey data

Date (Publication): 2022-11-02

Edition: 1

Citation identifier

Dataset DOI

Title: Information and documentation - Digital object identifier system

Date (Publication): 2012-04-23

Citation identifier: ISO 26324:2012

Citation identifier: doi:10.26179/60r9-ex93

Originator

Pauly. T.

Publisher

Australian Antarctic Data Centre

Principal investigator

PAULY, TIM

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

Collaborator

PAULY, TIM

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

Name: CAASM Metadata

Website: https://data.aad.gov.au/metadata/records/FIBEX_hydro

Status: Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Topic category

Biota
Oceans

Extent

N

S

E

W

Extent

Description: Temporal Coverage

Temporal extent

TimePeriod: 1981-01-20 1981-03-14

NASA/GCMD Earth Science Keywords

EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS

Keywords

Hydroacoustics
FIBEX

NASA/GCMD Earth Science Keywords

ECHO SOUNDERS

NASA/GCMD Earth Science Keywords

SHIPS

NASA/GCMD Earth Science Keywords

AMD/AU
CEOS
AMD

NASA/GCMD Earth Science Keywords

OCEAN > SOUTHERN OCEAN
GEOGRAPHIC REGION > POLAR
CONTINENT > ANTARCTICA

Resource constraints

Use limitation: This metadata record is publicly available.

Resource constraints

Access constraints: licence

Other constraints: All that remains of these data is a scanned copy of the acoustics logbook, which is available for download from the provided URL. A copy of the ANARE Research Note detailing publication of the data is also publicly available for download from the provided URL.

Resource constraints

File type: Portable Network Graphic

Linkage: Creative Commons by Attribution logo

Title: Attribution 4.0 International (CC BY 4.0)

Website: https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license

Use constraints: licence

Other constraints: This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=FIBEX_hydro when using these data.

Language: English

Character encoding: UTF8

Distribution Information

Distributor

Distributor

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Distributor

Fees: Free

Planned available datetime: 2022-11-02T00:00:00

Distributor

Fees: Free

Planned available datetime: 2022-11-02T00:00:00

Units of distribution: MB

Transfer size: 6.4

Distribution format

PDF

Units of distribution: MB

Transfer size: 195

Distribution format

PDF

OnLine resource: GET DATA > DIRECT DOWNLOAD
Download the scanned acoustics log

OnLine resource: VIEW RELATED INFORMATION > PUBLICATIONS
Download a copy of the ANARE Research Note - Hydroacoustic surveys of the distribution and abundance of krill: Prydz Bay region - FIBEX, ADBEX II and SIBEX II MV Nella Dan.

OnLine resource: VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset.

Resource lineage

Statement: This voyage is one of six which are studying the abundance and disribution of Euphausia superba and other zooplankton. This provides a good coverage of the area at varying season times and conditions. Ship-board instrumentation: A Simrad echosounding system was used, comprising of an EK-38 echosounder operating at 38 kHz, and EK-120 echosounder operating at 120 kHz, a QD echointegrator and grey scale chart recorders. The EK-38 was only used intermittently. The echosounder transducers were hull mounted approximately 6m below the surface. The towed transducer system was deployed at a nominal depth of 30m. Data collection: Fourteen transects were made, eleven in an east-west direction, parallel to the mean direction of the prevailing ocean currents and to the continental shelf, and three in a north-south direction. The 120kHz echosounder was run continuously while MV Nella Dan was in the study area. The QD integrator was set to integrate 8 depth layers between 1m and 200m below the transducer. The effective integration range was 7-206m. The echointegrator output, including the mean volume backscatter strength for each of the eight layers, was recorded on paper tape at the end of each 1 nautical mile integration interval. The mean target strength of krill were calculated from the lengths of the individual krill. Post-cruise processing: Acoustic data were processed on a VAX 11/750 computer. Mean density and variance of the mean were estimated using the ratio estimator, a process adopted at the second post-FIBEX acoustic workshop. Biomass was estimated for an area defined by a box drawn around the transects and extended on two sides by half the mean spacing between the transects. Mean krill biomass, variance of the biomass, and 95% confidence limits about the mean were calculated from the estimated mean and variance of the krill surface density. Please see the documentation reference for further details, and theoretical information. Data are logically consistent, as oceanographic data (CTD measurements) and water collections for phytoplankton pigment analysis were also obtained at the same sampling sites as the krill and zooplankton hauls and acoustic surveys. East-west transects were used for eleven of the fourteen transects on this cruise. It was decided that north-south transects were more effective, and these were used for the two following voyages. Cruise track was determined systematically before the commencement of the cruise, to eliminate any bias.

Hierarchy level: Dataset

Maintenance and update frequency: As needed

Maintenance note: 2018-05-21 - record updated by Dave Connell - basic updates. 2022-11-02 - record updated by Dave Connell to add a copy of the scanned acoustics log book.

Metadata

Metadata identifier: string/FIBEX_hydro

Language: English

Character encoding: UTF8

Author

PAULY, TIM

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

Sponsor

Australian Antarctic Division

Owner

AADC

Type of resource

Resource scope: Dataset

Alternative metadata reference

Title: gov.nasa.gsfc.gcmd

Citation identifier: 7ff75b23-d4fc-475d-b742-5c2211ae6f6f

Alternative metadata reference

Title: gov.nasa.gsfc.gcmd

Date (Last Revision): 2022-11-02T16:17:58

Identifier

Description: metadata.extraction_date

Alternative metadata reference

Title: gov.nasa.gsfc.gcmd

Citation identifier: 8.6

Metadata linkage: http://data.aad.gov.au/metadata/records/FIBEX_hydro
Point of truth for the metadata record

Date info (Creation): 1999-10-07T00:00:00

Date info (Last Update): 2022-11-02

Metadata standard

Title: ISO 19115-3

Edition: 2014

Other citation details: Version 1

Title: DIF to ISO 19115-1 Profile

Overviews

Spatial extent

N

S

E

W

Provided by

Access to the record in catalogue

Read here the full details and access to the data.

Associated resources

Not available