Nella Dan: ADBEX II Cruise - Hydroacoustic krill survey data

This dataset contains hydroacoustic results from the Antarctic Division Biomass Experiment II (ADBEX II) cruise of the Nella Dan. This cruise is the third in a series of six cruises, performing a long term survey of krill and other zooplankton distribution and abundance.


Australia was to have participated in the Second International Biomass Experiment I (SIBEX I), but withdrew due to resupply problems. ADBEX II is a reduced sampling program of what was to have been sampled during SIBEX I. Three transects were made off Antarctica in the Mawson region of the Australian sector, in January to March 1984, covering a survey area of 70,000 square kilometers. Quantitative and geographic krill distribution, abundance, mean and variance of the krill weight density, and total krill biomass were obtained. Biomass estimates for ADBEX II are given as 3.5 million tonnes, obtained by extrapolating over the survey area used on the SIBEX II cruise (1.28x10^6 square kilometers). Temperature, nutrient and salinty data were also obtained, as well as trawl results. Summary results are listed in the documentation.


The fields in this dataset are:

pressure

temperature

salinity

volume

geopotential

samples

deviation

Simple

Identification info

Alternate title
Nella Dan: ADBEX II Cruise - Hydroacoustic krill survey data
Date (Publication)
1999-10-07
Edition
1

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/ADBEX_II_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
Topic category
  • Biota
  • Oceans

Extent

N
S
E
W


Extent

Description
Temporal Coverage

Temporal extent

TimePeriod
1984-01-10 1984-03-07
Title
Hydroacoustic surveys of the distribution and abundance of krill: Prydz Bay region - FIBEX, ADBEX II and SIBEX II MV Nella Dan.
Date (Publication)
1988
Citation identifier
62

Author

Higginbottom, I.R., Kerry, K.R. and Wayte, S.E.
Name
Australian National Antarctic Research Expedition Research Notes
NASA/GCMD Earth Science Keywords
  • EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES
  • EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS
Keywords
  • DEVIATION
  • GEOPOTENTIAL
  • MARINE
  • OCEANOGRAPHY
  • PRESSURE
  • SALINITY
  • SAMPLES
  • TEMPERATURE
  • VOLUME
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

Resource constraints

Use limitation
This metadata record is publicly available.

Resource constraints

Access constraints
licence
Other constraints
Raw data are no longer available - summarised data are available in the ANARE Research Note at 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=ADBEX_II_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

Distributor

Fees
Free
Planned available datetime
1999-10-07T00:00:00
Units of distribution
MB
Transfer size
6.4
Distribution format
  • PDF

OnLine resource
VIEW RELATED INFORMATION > PUBLICATIONS

Download the ANARE Research Note

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. An additional 120kHz transducer deployed from the stern by a towed body was used when the hull mounted transducer failed. The towed transducer system was deployed at a nominal depth of 30m. Data collection: Three transects were made, 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 60-230m. 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 hydroacoustic surveys and the krill and zooplankton hauls. 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
2014-11-25 - record updated by Dave Connell to add a link to the ANARE Research Note.

Metadata

Metadata identifier
string/ADBEX_II_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
525228a2-4dd1-4f3f-90bd-8a54fc43123c

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Date (Last Revision)
2015-11-30T04:02:28

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/ADBEX_II_hydro

Point of truth for the metadata record

Date info (Creation)
1999-10-07T00:00:00
Date info (Last Update)
2017-04-26

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


Keywords


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Not available