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Modeling ice melange in an ice-sheet model
Identification_Information:
Citation:
Citation_Information:
Originator:The Pennsylvania State University
Publication_Date:2018
Title:
Modeling ice melange in an ice-sheet model
Other_Citation_Details:
David Pollard. Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania, USA. Natalya Gomez. Department of Earth and Planetary Sciences, McGill University, Montreal, Canada. Robert DeConto. Department of Geosciences, University of Massachusetts, Amherst, Massachusetts, USA. Holly Han. Department of Earth and Planetary Sciences, McGill University, Montreal, Canada.
Online_Linkage: http://www.datacommons.psu.edu/
Description:
Abstract: 
Rapidly retreating thick ice fronts can generate large amounts of melange
(floating ice debris), which may affect episodes of rapid retreat of 
Antarctic marine ice. In modern Greenland fjords, melange provides substantial 
back pressure on calving ice faces, which slows ice-front calving rates. 
On the much larger scales of West Antarctica, it is unknown if melange could 
clog seaways and provide enough back pressure to act as a negative feedback 
slowing retreat. Here we describe a new melange model, using a continuum 
mechanical formulation that is computationally feasible for long-term 
continental Antarctic applications. It is tested in an idealized rectangular 
channel, and calibrated very basically using observed modern conditions in 
Jakobshavn fjord, West Greenland. The model is then applied to drastic retreat 
of Antarctic ice in response to warm mid-Pliocene climate. With melange 
parameter values that yield reasonable modern Jakobshavn results, Antarctic 
marine ice still retreats drastically in the Pliocene simulations, with little 
slowdown despite the huge amounts of melange generated. This holds both for 
the rapid early collapse of West Antarctica, and later retreat into major East 
Antarctic basins. If parameter values are changed to make the melange much 
more resistive to flow, far outside the range for reasonable Jakobshavn 
results, West Antarctica still collapses and retreat is slowed or prevented 
only in a few East Antarctic basins.
Supplemental_Information: 
David Pollard. Earth and Environmental Systems Institute, Pennsylvania State 
University, University Park, Pennsylvania, USA.

Robert DeConto. Department of Geosciences, University of Massachusetts,
Amherst, Massachusetts, USA. 

Richard Alley. Department of Geosciences and Earth and Environmental Systems 
Institute, Pennsylvania State University, University Park, Pennsylvania, USA.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:2018
Currentness_Reference: 
publication date
Keywords:
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Categories
Theme_Keyword:climatologyMeteorologyAtmosphere
Theme_Keyword:environment
Theme_Keyword:Ice sheet modeling
Theme_Keyword:Ice melange modeling
Theme_Keyword:Jakobshavn fjord
Theme_Keyword:Antarctic Ice Sheet
Access_Constraints:None.
Use_Constraints: 
The University excludes any and all implied warranties, including warranties or merchantability and fitness for a particular purpose.
The University makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance.
The University will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.
The USER is granted permission to translate and add value to the FILES for the use of the FILES on its computer hardware; provided, however, that the USER annually notify the University of any customizing or value-adding work done.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Penn State
Contact_Person:David Pollard
Contact_Position:EMS Earth and Environmental Systems Institute
Contact_Address:
Address_Type:mailing address
Address: 
2217 Earth-Engineering Sciences Building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:USA
Contact_Voice_Telephone:814 865 2022
Contact_Electronic_Mail_Address:pollard@essc.psu.edu
Contact Instructions: 
David Pollard. Earth and Environmental Systems Institute, Pennsylvania State 
University, University Park, Pennsylvania, USA.

Robert DeConto. Department of Geosciences, University of Massachusetts,
Amherst, Massachusetts, USA. 

Richard Alley. Department of Geosciences and Earth and Environmental Systems 
Institute, Pennsylvania State University, University Park, Pennsylvania, USA.
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Organization:Penn State Data Commons
Contact_Address:
Address_Type:mailing and physical address
Address: 
115 Land and Water Building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:United States
Contact_Voice_Telephone:(814) 865 - 8792
Contact_Electronic_Mail_Address:datacommons@psu.edu
Distribution_Liability: 
The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.
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Metadata_Reference_Information:
Metadata_Date:2018
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Penn State Data Commons
Contact_Position:Metadata Coordinator
Contact_Address:
Address_Type:mailing address
Address: 
115 Land and Water Building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:United States
Contact_Voice_Telephone:814-865-8792
Contact_Electronic_Mail_Address:datacommons@psu.edu
Metadata_Standard_Name:FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version:FGDC-STD-001-1998
Metadata_Time_Convention:local time
Metadata_Extensions:
Online_Linkage:
Profile_Name:ESRI Metadata Profile
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