High resolution still photographs of the seafloor across the Mertz Glacier Region
Geoscience Australia and the Australian Antarctic Division conducted a benthic community survey using underwater still photographs on the shelf around the Mertz Glacier region. The purpose of the work was to collect high resolution still photographs of the seafloor across the shelf to address three...
Other Authors: | , , |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
Australian Antarctic Data Centre
|
Subjects: | |
Online Access: | https://researchdata.edu.au/high-resolution-photographs-glacier-region/702002 https://doi.org/10.4225/15/59acda196ccfb https://data.aad.gov.au/metadata/records/VMS_Benthic_Photography http://nla.gov.au/nla.party-617536 |
id |
ftands:oai:ands.org.au::702002 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC INDICATOR SPECIES EARTH SCIENCE BIOSPHERE ECOLOGICAL DYNAMICS COMMUNITY DYNAMICS COMMUNITY STRUCTURE VMS CLIVAR SR3 Photography Cameras CAMERA SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN > Mertz Polynya CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
spellingShingle |
oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC INDICATOR SPECIES EARTH SCIENCE BIOSPHERE ECOLOGICAL DYNAMICS COMMUNITY DYNAMICS COMMUNITY STRUCTURE VMS CLIVAR SR3 Photography Cameras CAMERA SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN > Mertz Polynya CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR High resolution still photographs of the seafloor across the Mertz Glacier Region |
topic_facet |
oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC INDICATOR SPECIES EARTH SCIENCE BIOSPHERE ECOLOGICAL DYNAMICS COMMUNITY DYNAMICS COMMUNITY STRUCTURE VMS CLIVAR SR3 Photography Cameras CAMERA SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN > Mertz Polynya CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
description |
Geoscience Australia and the Australian Antarctic Division conducted a benthic community survey using underwater still photographs on the shelf around the Mertz Glacier region. The purpose of the work was to collect high resolution still photographs of the seafloor across the shelf to address three main objectives: 1. to investigate benthic community composition in the area previously covered by the Mertz Glacier tongue and to the east, an area previously covered by fast ice 2. to investigate benthic community composition (or lack thereof) in areas of known iceberg scours 3. to investigate the lateral extent of cold water coral communities in canyons along the shelf break. Benthic photos were captured using a Canon EOS 20D SLR 8 megapixel stills camera fitted with a Canon EF 35mm f1.4 L USM lens in a 2500m rated flat port anodised aluminium housing. Two Canon 580EX Speedlight strobes were housed in 6000m rated stainless steel housings with hemispherical acrylic domes. The camera and strobes were powered with a 28V 2.5Ah cyclone SLA battery pack fitted in the camera housing and connected using Brantner Wetconn series underwater connectors. The results were obtained with 100 ASA and a flash compensation value of +2/3 of a stop. The focus was set manually to 7m and the image was typically exposed at f2.8 and a shutter speed of 1/60 sec. The interval between photos was set to 10 or 15 seconds. The camera was fitted to either the CTD frame or the beam trawl frame and lowered to approximately 4-5 m from the bottom. Two laser pointers, set 50 cm apart, were used for scale. The camera was deployed at 93 stations, 7 using the beam trawl frame and 86 using the CTD frame. The stations were named by: 1. Camera deployment frame (e.g. CTD or beam trawl, BT) 2. Frame sequence number (e.g. CTD53) 3. Instrument (e.g. camera = CAM) 4. Sequence of camera deployments through the survey overall (e.g. first deployment = CAM01, second deployment = CAM02 etc). For example, BT5_CAM16 is the sixteenth camera deployment of the survey overall, and was the fifth deployment using the beam trawl frame. From the 93 stations, there were 75 successful camera deployments. There were no photos captured at 9 stations. This was due to the camera or strobes malfunctioning, the camera being too far from the bottom, or the camera or strobes being in the mud at the bottom. The photos at a further 9 stations are considered poor due to the camera being out of focus, the camera being a little too far from the bottom or because very few photos were captured of the bottom. The benthic photo will be used to document the fauna and communities associated with representative habitats in the study area. The post-cruise analysis of the benthic photos will involve recording seabed geology and biology (class or order, and whatever is significant for the habitat) for each image |
author2 |
SMITH, JODIE (hasPrincipalInvestigator) SMITH, JODIE (processor) Australian Antarctic Data Centre (publisher) |
format |
Dataset |
title |
High resolution still photographs of the seafloor across the Mertz Glacier Region |
title_short |
High resolution still photographs of the seafloor across the Mertz Glacier Region |
title_full |
High resolution still photographs of the seafloor across the Mertz Glacier Region |
title_fullStr |
High resolution still photographs of the seafloor across the Mertz Glacier Region |
title_full_unstemmed |
High resolution still photographs of the seafloor across the Mertz Glacier Region |
title_sort |
high resolution still photographs of the seafloor across the mertz glacier region |
publisher |
Australian Antarctic Data Centre |
url |
https://researchdata.edu.au/high-resolution-photographs-glacier-region/702002 https://doi.org/10.4225/15/59acda196ccfb https://data.aad.gov.au/metadata/records/VMS_Benthic_Photography http://nla.gov.au/nla.party-617536 |
op_coverage |
Spatial: northlimit=-42; southlimit=-67; westlimit=140; eastLimit=150; projection=WGS84 Temporal: From 2011-01-04 to 2011-02-06 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(145.500,145.500,-67.167,-67.167) ENVELOPE(140,150,-42,-67) |
geographic |
Antarctic Southern Ocean Mertz Glacier Mertz Glacier Tongue |
geographic_facet |
Antarctic Southern Ocean Mertz Glacier Mertz Glacier Tongue |
genre |
Antarc* Antarctic Antarctica aurora australis Australian Antarctic Division Iceberg* Mertz Glacier Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica aurora australis Australian Antarctic Division Iceberg* Mertz Glacier Southern Ocean |
op_source |
Australian Antarctic Data Centre |
op_relation |
https://researchdata.edu.au/high-resolution-photographs-glacier-region/702002 99ed59e4-30b0-4cd6-abc9-9b58518e4188 doi:10.4225/15/59acda196ccfb VMS_Benthic_Photography https://data.aad.gov.au/metadata/records/VMS_Benthic_Photography http://nla.gov.au/nla.party-617536 |
op_doi |
https://doi.org/10.4225/15/59acda196ccfb |
_version_ |
1766272961014136832 |
spelling |
ftands:oai:ands.org.au::702002 2023-05-15T14:02:38+02:00 High resolution still photographs of the seafloor across the Mertz Glacier Region SMITH, JODIE (hasPrincipalInvestigator) SMITH, JODIE (processor) Australian Antarctic Data Centre (publisher) Spatial: northlimit=-42; southlimit=-67; westlimit=140; eastLimit=150; projection=WGS84 Temporal: From 2011-01-04 to 2011-02-06 https://researchdata.edu.au/high-resolution-photographs-glacier-region/702002 https://doi.org/10.4225/15/59acda196ccfb https://data.aad.gov.au/metadata/records/VMS_Benthic_Photography http://nla.gov.au/nla.party-617536 unknown Australian Antarctic Data Centre https://researchdata.edu.au/high-resolution-photographs-glacier-region/702002 99ed59e4-30b0-4cd6-abc9-9b58518e4188 doi:10.4225/15/59acda196ccfb VMS_Benthic_Photography https://data.aad.gov.au/metadata/records/VMS_Benthic_Photography http://nla.gov.au/nla.party-617536 Australian Antarctic Data Centre oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC INDICATOR SPECIES EARTH SCIENCE BIOSPHERE ECOLOGICAL DYNAMICS COMMUNITY DYNAMICS COMMUNITY STRUCTURE VMS CLIVAR SR3 Photography Cameras CAMERA SHIPS R/V AA > R/V Aurora Australis OCEAN > SOUTHERN OCEAN > Mertz Polynya CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR dataset ftands https://doi.org/10.4225/15/59acda196ccfb 2020-08-31T22:20:52Z Geoscience Australia and the Australian Antarctic Division conducted a benthic community survey using underwater still photographs on the shelf around the Mertz Glacier region. The purpose of the work was to collect high resolution still photographs of the seafloor across the shelf to address three main objectives: 1. to investigate benthic community composition in the area previously covered by the Mertz Glacier tongue and to the east, an area previously covered by fast ice 2. to investigate benthic community composition (or lack thereof) in areas of known iceberg scours 3. to investigate the lateral extent of cold water coral communities in canyons along the shelf break. Benthic photos were captured using a Canon EOS 20D SLR 8 megapixel stills camera fitted with a Canon EF 35mm f1.4 L USM lens in a 2500m rated flat port anodised aluminium housing. Two Canon 580EX Speedlight strobes were housed in 6000m rated stainless steel housings with hemispherical acrylic domes. The camera and strobes were powered with a 28V 2.5Ah cyclone SLA battery pack fitted in the camera housing and connected using Brantner Wetconn series underwater connectors. The results were obtained with 100 ASA and a flash compensation value of +2/3 of a stop. The focus was set manually to 7m and the image was typically exposed at f2.8 and a shutter speed of 1/60 sec. The interval between photos was set to 10 or 15 seconds. The camera was fitted to either the CTD frame or the beam trawl frame and lowered to approximately 4-5 m from the bottom. Two laser pointers, set 50 cm apart, were used for scale. The camera was deployed at 93 stations, 7 using the beam trawl frame and 86 using the CTD frame. The stations were named by: 1. Camera deployment frame (e.g. CTD or beam trawl, BT) 2. Frame sequence number (e.g. CTD53) 3. Instrument (e.g. camera = CAM) 4. Sequence of camera deployments through the survey overall (e.g. first deployment = CAM01, second deployment = CAM02 etc). For example, BT5_CAM16 is the sixteenth camera deployment of the survey overall, and was the fifth deployment using the beam trawl frame. From the 93 stations, there were 75 successful camera deployments. There were no photos captured at 9 stations. This was due to the camera or strobes malfunctioning, the camera being too far from the bottom, or the camera or strobes being in the mud at the bottom. The photos at a further 9 stations are considered poor due to the camera being out of focus, the camera being a little too far from the bottom or because very few photos were captured of the bottom. The benthic photo will be used to document the fauna and communities associated with representative habitats in the study area. The post-cruise analysis of the benthic photos will involve recording seabed geology and biology (class or order, and whatever is significant for the habitat) for each image Dataset Antarc* Antarctic Antarctica aurora australis Australian Antarctic Division Iceberg* Mertz Glacier Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Antarctic Southern Ocean Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) Mertz Glacier Tongue ENVELOPE(145.500,145.500,-67.167,-67.167) ENVELOPE(140,150,-42,-67) |