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    Implementation and Initial Evaluation of the Glimmer Community Ice Sheet Model in the Community Earth System Model

    Source: Journal of Climate:;2013:;volume( 026 ):;issue: 019::page 7352
    Author:
    Lipscomb, William H.
    ,
    Fyke, Jeremy G.
    ,
    Vizcaíno, Miren
    ,
    Sacks, William J.
    ,
    Wolfe, Jon
    ,
    Vertenstein, Mariana
    ,
    Craig, Anthony
    ,
    Kluzek, Erik
    ,
    Lawrence, David M.
    DOI: 10.1175/JCLI-D-12-00557.1
    Publisher: American Meteorological Society
    Abstract: he Glimmer Community Ice Sheet Model (Glimmer-CISM) has been implemented in the Community Earth System Model (CESM). Glimmer-CISM is forced by a surface mass balance (SMB) computed in multiple elevation classes in the CESM land model and downscaled to the ice sheet grid. Ice sheet evolution is governed by the shallow-ice approximation with thermomechanical coupling and basal sliding. This paper describes and evaluates the initial model implementation for the Greenland Ice Sheet (GIS). The ice sheet model was spun up using the SMB from a coupled CESM simulation with preindustrial forcing. The model's sensitivity to three key ice sheet parameters was explored by running an ensemble of 100 GIS simulations to quasi equilibrium and ranking each simulation based on multiple diagnostics. With reasonable parameter choices, the steady-state GIS geometry is broadly consistent with observations. The simulated ice sheet is too thick and extensive, however, in some marginal regions where the SMB is anomalously positive. The top-ranking simulations were continued using surface forcing from CESM simulations of the twentieth century (1850?2005) and twenty-first century (2005?2100, with RCP8.5 forcing). In these simulations the GIS loses mass, with a resulting global-mean sea level rise of 16 mm during 1850?2005 and 60 mm during 2005?2100. This mass loss is caused mainly by increased ablation near the ice sheet margin, offset by reduced ice discharge to the ocean. Projected sea level rise is sensitive to the initial geometry, showing the importance of realistic geometry in the spun-up ice sheet.
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      Implementation and Initial Evaluation of the Glimmer Community Ice Sheet Model in the Community Earth System Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4222528
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    • Journal of Climate

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    contributor authorLipscomb, William H.
    contributor authorFyke, Jeremy G.
    contributor authorVizcaíno, Miren
    contributor authorSacks, William J.
    contributor authorWolfe, Jon
    contributor authorVertenstein, Mariana
    contributor authorCraig, Anthony
    contributor authorKluzek, Erik
    contributor authorLawrence, David M.
    date accessioned2017-06-09T17:07:21Z
    date available2017-06-09T17:07:21Z
    date copyright2013/10/01
    date issued2013
    identifier issn0894-8755
    identifier otherams-79717.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222528
    description abstracthe Glimmer Community Ice Sheet Model (Glimmer-CISM) has been implemented in the Community Earth System Model (CESM). Glimmer-CISM is forced by a surface mass balance (SMB) computed in multiple elevation classes in the CESM land model and downscaled to the ice sheet grid. Ice sheet evolution is governed by the shallow-ice approximation with thermomechanical coupling and basal sliding. This paper describes and evaluates the initial model implementation for the Greenland Ice Sheet (GIS). The ice sheet model was spun up using the SMB from a coupled CESM simulation with preindustrial forcing. The model's sensitivity to three key ice sheet parameters was explored by running an ensemble of 100 GIS simulations to quasi equilibrium and ranking each simulation based on multiple diagnostics. With reasonable parameter choices, the steady-state GIS geometry is broadly consistent with observations. The simulated ice sheet is too thick and extensive, however, in some marginal regions where the SMB is anomalously positive. The top-ranking simulations were continued using surface forcing from CESM simulations of the twentieth century (1850?2005) and twenty-first century (2005?2100, with RCP8.5 forcing). In these simulations the GIS loses mass, with a resulting global-mean sea level rise of 16 mm during 1850?2005 and 60 mm during 2005?2100. This mass loss is caused mainly by increased ablation near the ice sheet margin, offset by reduced ice discharge to the ocean. Projected sea level rise is sensitive to the initial geometry, showing the importance of realistic geometry in the spun-up ice sheet.
    publisherAmerican Meteorological Society
    titleImplementation and Initial Evaluation of the Glimmer Community Ice Sheet Model in the Community Earth System Model
    typeJournal Paper
    journal volume26
    journal issue19
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00557.1
    journal fristpage7352
    journal lastpage7371
    treeJournal of Climate:;2013:;volume( 026 ):;issue: 019
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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