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Coupled GCM and sea-glacier modeling for Snowball Earth
Identification_Information:
Citation:
Citation_Information:
Originator:The Pennsylvania State University
Publication_Date:2017
Title:
Coupled GCM and sea-glacier modeling for Snowball Earth
Other_Citation_Details:
David Pollard. Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania, USA. James F. Kasting. Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania, USA. Michael E. Zugger. Applied Research Laboratory, Pennsylvania State University, State College, Pennsylvania, USA.
Online_Linkage: http://www.datacommons.psu.edu
Description:
Abstract: 
During Snowball Earth episodes of the Neoproterozoic and Paleoproterozoic,limited amounts of tropical open ocean (Jormungand), or tropical ocean withthin ice cover, would help to explain (1) vigorous glacial activity in lowlatitudes, (2) survival of photosynthetic life, and (3) deglacial recoverywithout excessive buildup of atmospheric CO2. Some previous models havesuggested that tropical open ocean or thin-ice cover is possible; howeverits viability in the presence of kilometer-thick sea glaciers flowing fromhigher latitudes has not been demonstrated conclusively. Here we describe anew method of asynchronously coupling a zonal sea-glacier model with a 3-DGlobal Climate Model, and apply it to Snowball Earth. Equilibrium curves ofice line vs. CO2 are mapped out, as well as their dependence on ocean heattransport efficiency, sea-glacier flow, and other model parameters. No climatestates with limited tropical open ocean or thin ice are found in any of ourmodel runs, including those with sea glaciers. If this result is correct, thenother refugia such as cryoconite pans would have been required for life tosurvive. However, the reasons for the differences between our results andothers should first be resolved. It is suggested that small-scale convectivedynamics, affecting fractional snow cover in low latitudes, may be a criticalfactor accounting for these differences.
Supplemental_Information: 
Pollard, D., J.F. Kasting and M.E. Zugger. (2017). Snowball Earth:
asynchronous coupling of sea-glacier flow with a global climate model.
J. Geophys. Research-Atmos., in review.
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:Snowball Earth
Theme_Keyword:Climate modeling
Theme_Keyword:Sea glaciers
Theme_Keyword:Jormungand states
Theme_Keyword:climatologyMeteorologyAtmosphere
Theme_Keyword:environment
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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