Ice shelf - ocean interaction in the cavity beneath the Amery Ice Shelf

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: Ice shelf - ocean interaction in the cavity beneath the Amery Ice Shelf
Description:
Abstract:
---- Public Summary from Project ---- Most of the snow falling on inland Antarctica drains via large ice streams and floating ice shelves to the sea where it lost by iceberg calving or as melt beneath the shelves. Ocean interaction beneath the shelves is complicated, and regions of basal refreezing as well as melt occur. These processes are important not only because they are a major component of the Antarctic mass budget, but because they also modify the characteristics of the ocean, influencing the formation of Antarctic Bottom Water which plays a major role in the global ocean circulation. The processes are sensitive to climate change, and shifts in ocean temperature or circulation near Antarctica could lead to the disappearance of all Antarctic ice shelves. The Amery Ice Shelf is the major embayed shelf in East Antarctica, and the subject of considerable previous ANARE investigation. Ocean interaction processes occurring beneath the shelf are only poorly understood, and this project will directly measure water characteristics and circulation in the cavity underneath the ice shelf, and the rates of melt and freezing on the bottom of the shelf. These measurements will be made through a number of access holes melted through the shelf. The project is closely linked with other projects investigating the circulation and interactions in the open ocean to the north of the shelf, and studies of the ice shelf flow and mass budget. There will be child records for each of the following data sets: AM01 and AM01 b boreholes * CTD profiles through water column * CTD annual records at selected depths * Ocean current profiles through water column * Temperature measurements through ice shelf and across ice-water interface * Small ice core samples * 0.5 m sea floor sediment core * Video footage of borehole walls (including marine ice) and sea floor benthos * GPS records of surface tidal motion * Video AM02 borehole * CTD profiles through water column * CTD annual records at selected depths * Borehole diameter caliper profiles * Temperature measurements through ice shelf and across ice-water interface * 1.5 m sea floor sediment core * GPS records (surface elevation, ice motion) AM03 borehole * Aquadopp current meter data * Brancker thermistor data * Caliper data * FSI-CTD profile data * Drilling parameters data * Seabird MicroCAT CTD moorings at three depths in ocean cavity beneath the shelf * Video AM04 borehole * Aquadopp current meter data * Brancker thermistor data * Caliper data * FSI-CTD profile data * Drilling parameters data * Seabird MicroCAT CTD moorings at three depths in ocean cavity beneath the shelf * Video AM05 borehole * Aquadopp current meter data * Caliper data * FSI-CTD profile data * Drilling parameters data * Seabird MicroCAT CTD moorings in ocean cavity beneath the shelf AM06 borehole * Aquadopp current meter data * Caliper data * FSI-CTD profile data * Drilling parameters data * Seabird MicroCAT CTD moorings in ocean cavity beneath the shelf Taken from the 2008-2009 Progress Report: Progress Against Objectives: The work undertaken in the past 12 months has continued to relate chiefly to the first of our objectives - "quantify the characteristics and circulation of ocean water in the cavity beneath the Amery Ice Shelf". Data from the AMISOR project have provided the first record of a seasonal cycle of ice shelf-ocean interaction. After recovering the 2008 data we now have near-continuous oceanographic data from beneath the Amery at 3 different depths for 6, 6, 3, and 3 years from 4 different sites. Note that the instruments at AM01 and AM02 (6 annual cycles of data each) are no longer recording due to expiration of the onboard batteries (3-5 years expected life cycle). This allows us to investigate the "real" 3-D, seasonally varying, circulation and melt/freezing cycle beneath an ice shelf - rather than the steady state, simplified "2-D ice pump circulation" that has mostly been assumed previously. As much as 80% of the continental ice that flows into the Amery Ice Shelf from the Lambert Glacier basin is lost as basal melt melt beneath the southern part of the shelf, but a considerable amount of ice is also frozen onto the base in the north-western part of the shelf. These processes of melt and refreezing are due to a pattern of water circulation beneath the ice shelf which is driven by sea ice formation outside the front of the shelf. Our multi-year data from 4 sites beneath the Amery ice shelf show that there is a very strong seasonal cycle in the characteristics of the ocean water beneath the shelf, and strong interseasonal variability in this. The seasonal cycle is driven mostly by the seasonal cycle of sea ice formation and decay in Prydz Bay, and interseasonal variations are due to differences in the general ocean circulation, and in particular the upwelling of Circumpolar Deep Water onto the continental shelf in Prydz Bay. The melt and freeze processes beneath the ice shelf, also themselves modify the water characteristics. Taken from the 2009-2010 Progress Report: The AMISOR project drilled two new 600 m deep boreholes on the Amery Ice Shelf in 2009-10: the first on the marine ice flowline to enhance understanding of the re-freezing process beneath the shelf; and the second in a region of known interest with respect to circulation patterns in the ocean cavity below the shelf. Instrument deployments at both sites should provide valuable annual cycle data over the next 4-5 years.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Craven M., Elcheikh A., Brand R., Jones N. 2002 Hot water drilling on the Amery Ice Shelf - the AMISOR project. Memoirs of National Institute of Polar Research. Special Issue. 56 217-225
Supplemental_Information:
REFERENCE: Fricker H.A., Popov S., Allison I., Young N.W. 2001 Distribution of marine ice beneath the Amery Ice Shelf. Geophysical Research Letters 28 11 2241-2244
Supplemental_Information:
REFERENCE: Jacka T.H., and the ISMASS Committee 2004 Recommendations for the collection and synthesis of Antarctic Ice Sheet mass balance data. Global and Planetary Change 42 1-15
Supplemental_Information:
REFERENCE: Craven M., Allison I., Brand R., Elcheikh A., Hunter J., Hener M., Donoghue S. 2004 Initial borehole results from the Amery Ice Shelf hot-water drilling project. Annals of Glaciology 39 531-539
Supplemental_Information:
REFERENCE: Young N.W., Hyland G. 2002 Velocity and strain rates derived from InSAR analysis over the Amery Ice Shelf, East Antarctica. Annals of Glaciology 34 228-234
Supplemental_Information:
REFERENCE: Fricker H.A., Young N.W., Allison I., Coleman R. 2002 Iceberg calving from the Amery Ice Shelf, East Antarctica. Annals of Glaciology 34 241-246
Supplemental_Information:
REFERENCE: Craven M., Carsey F., Nicol S. 2006 Ice krill under the Amery Ice Shelf, East Antarctica. Antarctic Science 18 1 81-82
Supplemental_Information:
REFERENCE: Craven M., Carsey F., Behar A., Matthews J., Brand R., Elcheikh A., Hall S., Treverrow A. 2005 Borehole imagery of meteoric and marine ice layers in the Amery Ice Shelf, East Antarctica. Journal of Glaciology 51 172 75-84
Supplemental_Information:
REFERENCE: Roberts D., Craven M., Cai M., Allison I., Nash G. 2006 Protists in the marine ice of the Amery Ice Shelf, East Antarctica. Polar Biology doi 10.1007/s003000-0006-0169-7
Supplemental_Information:
REFERENCE: Riddle M.J., Craven M., Goldsworthy P.M., Carsey F. 2007 A diverse benthic assemblage 100 km from open water under the Amery Ice Shelf, Antarctica Paleoceanography 22 PA1204 doi:10.1029/2006PA001327
Supplemental_Information:
REFERENCE: Post A.L., Hemer M.A., O'Brien P.E., Roberts D., Craven M. 2007 History of benthic colonisation beneath the Amery Ice Shelf, East Antarctica Marine Ecology Progress Series 344 doi: 10.3354/meps06966
Supplemental_Information:
REFERENCE: Hemer M.A., Post A.L., O'Brien P.E., Craven M., Truswell E.M., Roberts D., Harris P.T. 2007 Sedimentological signatures of the sub-Amery Ice Shelf circulation Antarctic Science DOI: 10.1017/S0954 102007000697
Supplemental_Information:
REFERENCE: Hemer M.A., Harris P.T. 2003 Sediment core from beneath the Amery Ice Shelf, East Antarctica, suggests mid-Holocene ice-shelf retreat Geology 31 2 127-130
Supplemental_Information:
REFERENCE: Maraldi C., Galton-Fenzi B., Lyard F., Testut L., Coleman R. 2007 Barotrophic tides of the Southern Indian Ocean and the Amery Ice Shelf cavity Geophysical Research Letters 34 L18602 doi:10.1029/2007GL030900
Supplemental_Information:
REFERENCE: Cai M.-H., Li Y.-S., Allison I., Curran M.A.J. 2006 Chemical and biological properties of marine ice from the Amery Ice Shelf, East Antarctica. Abstracts of the SCAR Open Science Conference 0256/313 Hobart, 12-14 July 2006
Supplemental_Information:
REFERENCE: Post A.L., Hemer M.A., Roberts D., O'Brien P.E., Craven M. 2006 Life beneath the ice: A history of benthic colonisation beneath the Amery Ice Shelf, Antarctica. Abstracts of the SCAR Open Science Conference 0153/112 Hobart, 12-14 July 2006
Supplemental_Information:
REFERENCE: Galton-Fenzi B.K., Tassell H., McMahon K., Coleman R., Hunter J., Pedro J. 2006 Observing the ice pump under the Amery Ice Shelf Abstracts of the SCAR Open Science Conference 0412/313 Hobart, 12-14 July 2006
Supplemental_Information:
REFERENCE: Carsey F.D., Behar A., Engelhardt H., Craven M., Vogel S., Christoffersen P 2004 Study of Ice Sheet Basal Processes With Visible Light Images Acquired from a Borehole Probe AGU Fall Meeting 85 47 Session: Uses of Photography in Cryospheric Studies, 13-17 December 2004 C42A-08
Supplemental_Information:
REFERENCE: Allison I., Hunter J., Craven M. 2005 Spatial and seasonal variability of ice-ocean interaction beneath the Amery Ice Shelf Conference Program and Abstract Book: Dynamic Planet 2005 79 82 Cairns, Australia, August 22-26, 2005
Supplemental_Information:
REFERENCE: Allison I. 2003 Climate interactions in the marine cryosphere. Abstract Volume, XXIII General Assembly of the International Union of Geodesy and Geophysics B.63 Sapporo, Japan. July 2003 JSM10/07P/B23-001
Supplemental_Information:
REFERENCE: Allison I., Fricker H., Craven M., Young N. 2003 The AMISOR project: Amery Ice Shelf dynamics and ice-ocean interaction. Abstract Volume, XXIII General Assembly of the International Union of Geodesy and Geophysics B.64 Sapporo, Japan. July 2003 JSM10/7P/B23-007
Supplemental_Information:
REFERENCE: Rapley C., Bell R.E., Allison I., and 12 others 2004 A new phase of polar exploration and understanding: the International Polar Year - 2007-2008 SCAR Open Science Conference "Antarctica and the Southern Ocean in the Global Systems" Bremen, Germany, 25-31 July 2004
Supplemental_Information:
REFERENCE: Craven M., Brand R., Elcheikh A., Hall S., Treverrow A, Matthews J 2004 AMISOR-4 2003-04 AM01b Summer Field Report "Run away, run away..."
Supplemental_Information:
REFERENCE: Craven M. 2003 On the Shoulders of Giants - Part 3: The AMISOR Project 2001-02. Aurora 22 3 14-17
Supplemental_Information:
REFERENCE: Hunter J., Hemer M., Craven M. 2004 Modelling the Circulation Under the Amery Ice Shelf. Proceedings of the 17th International FRISP Workshop, Cambridge, U.K. 15 1-6 FRISP Report
Supplemental_Information:
REFERENCE: Leffanue H., Craven M. 2004 Circulation and water masses from current meter and T/S measurements at the Amery Ice Shelf. Smedsrud L. 15 73-79 FRISP Report
Supplemental_Information:
REFERENCE: Allison I. 2003 The AMISOR project: ice shelf dynamics and ice-ocean interaction of the Amery Ice Shelf. 16th International FRISP Workshop in Bergen 14 9 Geophysical Institute, University of Bergen, Norway
Supplemental_Information:
REFERENCE: Allison I. 2003 The AMISOR project: ice shelf dynamics and ice-ocean interaction of the Amery Ice Shelf. 16th International FRISP Workshop in Bergen 14 9 Geophysical Institute, University of Bergen, Norway,FRISP Report
Supplemental_Information:
REFERENCE: Treverrow A., Warner R.C., Craven M., Budd W.F. 2007 Crystallography of the Amery Ice Shelf Marine and Meteoric Ice Observations Antarctic Climate and Ecosystems CRC Symposium Hobart, 2007
Supplemental_Information:
REFERENCE: Craven M., Rasch D., Brand R., Drinkell A., Donoghue S., Pedro J. 2006 Borehole imagery within and beneath the Amery Ice Shelf Abstracts of the SCAR Open Science Conference Hobart, 12-14 July 2006 0196/313 (Poster)
Supplemental_Information:
REFERENCE: Craven M. 2004 AMISOR Trilogy: The diesel and the dog. Australian Antarctic Magazine 6 18-19
Supplemental_Information:
REFERENCE: Allison I. 2001 Peephole through the ice: the AMISOR project. Australian Antarctic Magazine 20-21
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20000101
Ending_Date: Unknown
Currentness_Reference:Unknown
Status:
Progress: In Work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 70.37
East_Bounding_Coordinate: 72.64
North_Bounding_Coordinate: -69.19
South_Bounding_Coordinate: -70.56
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > ICE DEPTH/THICKNESS
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > SNOW/ICE TEMPERATURE
Theme_Keyword: EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENT COMPOSITION
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENTATION
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > STRATIGRAPHIC SEQUENCE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > POTENTIAL TEMPERATURE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > THERMOCLINE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
Theme_Keyword: EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY
Theme_Keyword: EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > SNOW/ICE CHEMISTRY
Theme_Keyword: GROUND-BASED OBSERVATIONS
Theme_Keyword: FIELD INVESTIGATION
Theme_Keyword: Amery Ice Shelf
Theme_Keyword: Amisor
Theme_Keyword: Bathymetry
Theme_Keyword: Hot Water Drill
Theme_Keyword: Ice Cores
Theme_Keyword: Ice Thickness
Theme_Keyword: Salinity
Theme_Keyword: Sediments
Theme_Keyword: Temperature
Theme_Keyword: Velocity
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: INLAND WATERS
Theme_Keyword: OCEANS
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > SOUTHERN OCEAN
Place_Keyword: CONTINENT > ANTARCTICA
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Currently only data greater than two years old is publicly available. More data will come on line as further seasonal uploads are conducted. A summary excel file is available for download from the URL given below.
Use_Constraints:
This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/3.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_1164 when using these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: IAN ALLISON
Contact_Person_Primary:
Contact_Person: MIKE CRAVEN
Contact_Position: INVESTIGATOR
Contact_Position: TECHNICAL CONTACT
Contact_Position: TECHNICAL CONTACT
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Australian Antarctic Division
Address: 203 Channel Highway
City: Kingston
State_or_Province: Tasmania
Postal_Code: 7050
Country: Australia
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 203 Channel Highway
Address: Australian Antarctic Division
City: Kingston
State_or_Province: Tasmania
Postal_Code: 7050
Country: Australia
Contact_Voice_Telephone: +61 3 6226 7648
Contact_Voice_Telephone: +61 3 6226 7876
Contact_Facsimile_Telephone: +61 3 6226 7650
Contact_Facsimile_Telephone: +61 3 6226 6902
Contact_Electronic_Mail_Address: ian.allison@aad.gov.au
Contact_Electronic_Mail_Address: m.craven@utas.edu.au
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
See Readme files in the download files of the child metadata records for details of data quality and equipment down-time. Note - depths provided in spatial coverage are referenced back to sea level. The minimum depth asl refers to the height of the ice surface.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: AU/AADC > Australian Antarctic Data Centre, Australia
Contact_Person: DATA OFFICER AADC
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Australian Antarctic Division
Address: 203 Channel Highway
City: Kingston
State_or_Province: Tasmania
Postal_Code: 7050
Country: Australia
Contact_Voice_Telephone: +61 3 6232 3244
Contact_Facsimile_Telephone: +61 3 6232 3351
Contact_Electronic_Mail_Address: metadata@aad.gov.au
Resource_Description: ASAC_1164
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: excel
Transfer_Size: 11 kb
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://data.aad.gov.au
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://data.aad.gov.au/aadc/portal/download_file.c...
Access_Instructions:
Download point for the data
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://secure3.aad.gov.au/proms/public/projects/r...
Access_Instructions:
Public information for ASAC project 1164
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://data.aad.gov.au/aadc/metadata/citation.cfm?...
Access_Instructions:
Citation reference for this metadata record and dataset
Fees: Free
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Metadata_Reference_Information:
Metadata_Date: 20000809
Metadata_Review_Date: 20140828
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: MIKE CRAVEN
Contact_Position: TECHNICAL CONTACT
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 203 Channel Highway
Address: Australian Antarctic Division
City: Kingston
State_or_Province: Tasmania
Postal_Code: 7050
Country: Australia
Contact_Voice_Telephone: +61 3 6226 7876
Contact_Facsimile_Telephone: +61 3 6226 6902
Contact_Electronic_Mail_Address: m.craven@utas.edu.au
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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