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Ice sheet-Earth-sea level modeling of Antarctic Ice Sheet variations
Identification_Information:
Citation:
Citation_Information:
Originator:The Pennsylvania State University
Publication_Date:2017
Title:
Ice sheet-Earth-sea level modeling of Antarctic Ice Sheet variations
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.
Online_Linkage: http://www.datacommons.psu.edu
Description:
Abstract: 
A coupled ice sheet-solid Earth-sea level model is applied to long-term 
variations of the Antarctic ice sheet. A set of radially varying viscoelastic 
profiles in the global Earth model is used to explore feedbacks on ice-sheet 
variability, including one with a very weak upper mantle zone and thin 
lithosphere representative of West Antarctic regions. Simulations are performed
for (1) the deglacial retreat over the last ~20,000 years, (2) the future 5000 
years with greenhouse-gas scenario RCP8.5, and (3) the warm Pliocene ~3 Ma. 
For the deglacial period a large ensemble of 625 simulations is analyzed, 
with a score computed for each run based on comparisons to geologic and modern 
data. For each of the five Earth profiles, the top-scoring combinations of the 
other model parameters in the ensemble are used to perform future and Pliocene 
simulations. For the last deglacial retreat, the viscoelastic Earth profiles 
produce relatively small differences in overall ice volume and equivalent sea 
level. In contrast, profiles with weak upper mantle and thin lithosphere 
produce strong negative feedback and less ice retreat in the future and 
Pliocene runs. This is due to the faster pace of ice-sheet retreat in these 
runs, leading to greater lags in the viscous bedrock rebound behind the 
unloading, which allows for greater influence of the viscosity profiles. 
However, the differences in grounding-line retreat are located primarily 
in East Antarctic basins, where a weak upper mantle and thin lithosphere 
may not be realistic, emphasizing the need for lateral heterogeneity in 
the Earth model.  Journal DOI 10.1002/2017JF004371
Supplemental_Information: 
Pollard, D., N. Gomez and R. DeConto. 2017. Variations of the Antarctic Ice 
Sheet in a coupled ice sheet-Earth-sea level model: sensitivity to 
viscoelastic Earth properties. J. Geophysical Research-Earth Surface, in press.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:2017
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:Earth-sea level modeling
Theme_Keyword:Earth viscoelastic profiles
Theme_Keyword:Antarctc 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_Person_Primary:
Contact_Person:David Pollard
Contact_Organization:Penn State
Contact_Address:
Address_Type:mailing address
Address: 
EMS Earth and Environmental Systems Institute
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
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_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_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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