Implementation of a sea-ice model for application in the Antarctic

Federal Geographic Data Committee (FGDC) Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
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Identification_Information:

Citation:

Citation_Information:

Originator: Unknown

Publication_Date: Unknown

Title: Implementation of a sea-ice model for application in the Antarctic

Description:

Abstract:

Metadata record for data from ASAC Project 2504 See the link below for public details on this project. In this project a sea-ice model for application in Southern Ocean climate and forecasting studies will be developed to amend identified deficiencies in numerical models (i.e. unaccounted short-term dynamics; or non-suitable ice rheology). In-situ deformation and ice-stress data will be used to derive parameterisations suitable for the Southern Ocean pack. Antarctic sea ice is an important component of the Southern Hemisphere climate. It provides a habitat for algae, plankton and for larger species such as mammals or penguins. It is a transport medium for freshwater and biological matter. On the other hand it acts like a barrier between ocean and atmosphere in regard to the exchange of thermal energy, water vapour and gases. Sea ice affects the polar climate in many ways: E.g., by effectively insulating the ocean from the colder atmosphere the sea ice enables an advection of relatively warm water onto the shallow Antarctic continental shelf. This warmer water is then available to interact with other components of the climate system, such as by basal melting of the continental ice shelves [Jenkins and Holland, 2002]. Also, due to its high albedo, the sea ice has a large-scale effect on the net incoming solar radiation [Ebert et al., 1995] and reduces the absorption of solar energy into the upper ocean. The thermodynamic growth of seaice and the consequent desalination of the ice gives rise to a transport of salt from the ice into the ocean, which increases the water density over the shelf, thereby driving the deep vertical overturning cell in the global ocean circulation. High ice-growth rates (e.g., in regions of polynyas) are generally concentrated in small areas in shallow waters. These regions are often insufficiently resolved or even unresolved in coupled climate models, which are generally configured to run at a spatial resolution of 2 degree longitude by 1 degree latitude or coarser [Zhang and Hunke, 2001]. The specific objectives of this project are to: * identify the variabilities in the sea-ice characteristics and the underlying physical processes; * identify the time scales, at which the sea ice interacts with the ocean and atmosphere; * assess the contribution of sub-daily ice motion and deformation due to tidal forcing and inertial response to changes within the Antarctic ocean-ice-atmosphere system; * derive the impact of sub-daily ice dynamics on the sea-ice area, extent and mass on interannual and decadal time scales; * determine the scale effect of dynamic processes on the accuracy of modelled sea-ice parameters using a global high-resolution model; * identify model uncertainties through comprehensive validation studies. However, logistical problems prevented the project from collecting any data in the field. To overcome the paucity of planned buoy data we used the following data sets to address some of the aspects of the original proposal: 1) Sea-ice buoy data: ISPOL 2004: See AAS #2500 for metadata. 2) Numerical investigations: We have investigated the failure of sea ice using an isotropic model [Hibler, 1979], where ice strength is modelled as a random variable in the model space. In situ weakening was prescribed by a fracture-based Coulombic rheology [Hibler and Schulson, 2000]. We realised this by parameterising weakening with an ice-strength parameter of 1000 and initialising the ice strength across the model grid by random. The simulations were run over a 2000 km by 2000 km region and forced, from rest, with an idealised wind field. We analysed the sensitivity of failure to ice strength and wind stress as well as the intersection angle of the wind stress, and conducted idealised 2D failure experiments.

Purpose:

Not Available

Supplemental_Information:

REFERENCE: Stevens, R.P. and Heil, P. 2011 The interplay of dynamic and thermodynamic processes in driving the ice-edge location in the Southern Ocean. Annals of Glaciology 52 57 27-34

Supplemental_Information:

REFERENCE: Roberts, J., Heil, P., Phipps, S.J. and Bindoff, N. 2007 AusCOM: The Australian Community Ocean Model Journal of Research and Practice in Information Technology 39 2 137-150

Supplemental_Information:

REFERENCE: Heil, P., Worby, A.P., Hutchings, J.K., Hibler, W.D., Johannessen, M., Launiainen, J. and Haas, C. 2007 Ice drift and deformation during ISPOL2004 14th AMOS Conference, 5th-7th February 2007, Adelaide, Australia 1

Supplemental_Information:

REFERENCE: Heil, P. 2007 In situ observations of Antarctic sea-ice drift and deformation Argos User Meeting, 1st April 2007, Hobart, Australia 1

Supplemental_Information:

REFERENCE: Roberts, J.L., Heil, P., Murray, R.J., Holloway, D.S. and Bindoff, N.L. 2006 Pole relocation for an orthogonal grid: An analytic method. Ocean Modelling 12 16-31

Supplemental_Information:

REFERENCE: Hutchings, J.K., Heil, P. and Hibler III, W.D. 2005 Modeling linear kinematic features in sea ice. Monthly Weather Review 133 3481-3497

Supplemental_Information:

REFERENCE: Roberts, J., Heil, P., Phipps, J., Bindoff, N., Brassington, G., Alves, O., Hanson, L., Schiller, A. and Fiedler, R. 2005 AusCOM: The Australian Community Ocean Model. APAC-05 Conference on Advanced Computing, Grid Applications and eResearch, Gold Coast, Australia, 26th-29th September 2005 15

Supplemental_Information:

REFERENCE: Heil, P., Worby, A.P., Hutchings, J.K., Launiainen, J., Johansson, M. and Hibler III, W. 2005 Ice Station POLarstern (ISPOL):Drifting Buoy Data Report Antarctic Climate and Ecosystems Cooperative Research Centre 1 20

Supplemental_Information:

REFERENCE: Heil, P. 2005 Improved treatment of ice-ocean interactions enhances climate modelling. Australian Antarctic Magazine 9 10

Supplemental_Information:

REFERENCE: Roberts, A., Heil, P. and Budd, W.F. 2004 Medium range prediction of Antarctic sea ice. 1st General Assembly Nice, France, 25-30 April 2004

Supplemental_Information:

REFERENCE: Heil, P., Roberts, J.L., Phipps, S.J., Fiedler, R.A.S. and Bindoff, N.L. 2003 Toward a high-resolution coupled ocean-sea ice model. APAC'03 on Advanced Computing, Grid Applications and eResearch, Gold Coast, Australia, 29th Sep - 2nd Oct 2003. 1 10 0-9579303-1-3

Supplemental_Information:

REFERENCE: Heil, P. and Bindoff, N. 2003 TPAC workshop on Coupled Oceans and Atmospheres. Bulletin of the Australian Meteorological and Oceanographic Society. 16 48-49

Supplemental_Information:

REFERENCE: Hibler, W.D. III 1979 A dynamic thermodynamic sea ice model J. Phys. Oceanogr. 9 815 - 846

Supplemental_Information:

REFERENCE: Hibler, W.E., and E. Schulson 2000 On modelling the anisotropic failure and flow of flawed sea ice J. Geophys. Res. 105 C7 17105 - 17120

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20041201

Ending_Date: Unknown

Currentness_Reference:Unknown

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent:

Bounding_Coordinates:

West_Bounding_Coordinate: -180.0

East_Bounding_Coordinate: 180.0

North_Bounding_Coordinate: -60.0

South_Bounding_Coordinate: -70.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS

Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS

Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY

Theme_Keyword_Thesaurus: DATA SET LANGUAGE

Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE DEFORMATION

Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE EXTENT

Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > ICE EXTENT

Theme_Keyword: EARTH SCIENCE > OCEANS > SEA ICE > ICE DEFORMATION

Theme_Keyword: Modeling

Theme_Keyword: Sea Ice

Theme_Keyword: Climate

Theme_Keyword: Forecasting

Theme_Keyword: OCEANS

Theme_Keyword: ENGLISH

Place:

Place_Keyword_Thesaurus: GCMD

Place_Keyword: OCEAN > SOUTHERN OCEAN

Place_Keyword: GEOGRAPHIC REGION > POLAR

Access_Constraints: Copies of some of the referenced papers are attached to this record, but they are not available for download. Details of the models developed are listed in the referenced publications.

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_2504 when using these data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: PETRA HEIL

Contact_Position: INVESTIGATOR

Contact_Position: TECHNICAL CONTACT

Contact_Position: DIF AUTHOR

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Antarctic CRC

Address: GPO Box 252 - 80

Address: University of Tasmania

City: Hobart

State_or_Province: Tasmania

Postal_Code: 7001

Country: Australia

Contact_Voice_Telephone: +61 3 6226 7646

Contact_Facsimile_Telephone: +61 3 6226 7650

Contact_Electronic_Mail_Address: petra.heil@utas.edu.au

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Dates provided in temporal coverage are approximate only. All field work for this project was unfortunately cancelled due to difficulties on board the ship. As a result this project became purely a modeling project.

Logical_Consistency_Report:

Not Available

Completeness_Report:

Not Available

Lineage:

Process_Step:

Process_Description:

Not Available

Process_Date: Unknown

Spatial_Reference_Information:

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_2504

Distribution_Liability:

Not Available

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: pdf

Transfer_Size: 3.2 MB

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:

https://secure3.aad.gov.au/proms/public/projects/r...

Access_Instructions:

Public information for ASAC project 2504

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 papers

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

Metadata_Reference_Information:

Metadata_Date: 20050302

Metadata_Review_Date: 20121022

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: PETRA HEIL

Contact_Position: INVESTIGATOR

Contact_Position: TECHNICAL CONTACT

Contact_Position: DIF AUTHOR

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Antarctic CRC

Address: GPO Box 252 - 80

Address: University of Tasmania

City: Hobart

State_or_Province: Tasmania

Postal_Code: 7001

Country: Australia

Contact_Voice_Telephone: +61 3 6226 7646

Contact_Facsimile_Telephone: +61 3 6226 7650

Contact_Electronic_Mail_Address: petra.heil@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