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    Transient Climate Response in a Two-Layer Energy-Balance Model. Part I: Analytical Solution and Parameter Calibration Using CMIP5 AOGCM Experiments

    Source: Journal of Climate:;2012:;volume( 026 ):;issue: 006::page 1841
    Author:
    Geoffroy, O.
    ,
    Saint-Martin, D.
    ,
    Olivié, D. J. L.
    ,
    Voldoire, A.
    ,
    Bellon, G.
    ,
    Tytéca, S.
    DOI: 10.1175/JCLI-D-12-00195.1
    Publisher: American Meteorological Society
    Abstract: his is the first part of a series of two articles analyzing the global thermal properties of atmosphere?ocean coupled general circulation models (AOGCMs) within the framework of a two-layer energy-balance model (EBM). In this part, the general analytical solution of the system is given and two idealized climate change scenarios, one with a step forcing and one with a linear forcing, are discussed. These solutions give a didactic description of the contributions from the equilibrium response and of the fast and slow transient responses during a climate transition. Based on these analytical solutions, a simple and physically based procedure to calibrate the two-layer model parameters using an AOGCM step-forcing experiment is introduced. Using this procedure, the global thermal properties of 16 AOGCMs participating in phase 5 of the Coupled Model Intercomparison Project (CMIP5) are determined. It is shown that, for a given AOGCM, the EBM tuned with only the abrupt 4?CO2 experiment is able to reproduce with a very good accuracy the temperature evolution in both a step-forcing and a linear-forcing experiment. The role of the upper-ocean and deep-ocean heat uptakes in the fast and slow responses is also discussed. One of the main weaknesses of the simple EBM discussed in this part is its ability to represent the evolution of the top-of-the-atmosphere radiative imbalance in the transient regime. This issue is addressed in Part II by taking into account the efficacy factor of deep-ocean heat uptake.
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      Transient Climate Response in a Two-Layer Energy-Balance Model. Part I: Analytical Solution and Parameter Calibration Using CMIP5 AOGCM Experiments

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4222249
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    contributor authorGeoffroy, O.
    contributor authorSaint-Martin, D.
    contributor authorOlivié, D. J. L.
    contributor authorVoldoire, A.
    contributor authorBellon, G.
    contributor authorTytéca, S.
    date accessioned2017-06-09T17:06:21Z
    date available2017-06-09T17:06:21Z
    date copyright2013/03/01
    date issued2012
    identifier issn0894-8755
    identifier otherams-79466.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222249
    description abstracthis is the first part of a series of two articles analyzing the global thermal properties of atmosphere?ocean coupled general circulation models (AOGCMs) within the framework of a two-layer energy-balance model (EBM). In this part, the general analytical solution of the system is given and two idealized climate change scenarios, one with a step forcing and one with a linear forcing, are discussed. These solutions give a didactic description of the contributions from the equilibrium response and of the fast and slow transient responses during a climate transition. Based on these analytical solutions, a simple and physically based procedure to calibrate the two-layer model parameters using an AOGCM step-forcing experiment is introduced. Using this procedure, the global thermal properties of 16 AOGCMs participating in phase 5 of the Coupled Model Intercomparison Project (CMIP5) are determined. It is shown that, for a given AOGCM, the EBM tuned with only the abrupt 4?CO2 experiment is able to reproduce with a very good accuracy the temperature evolution in both a step-forcing and a linear-forcing experiment. The role of the upper-ocean and deep-ocean heat uptakes in the fast and slow responses is also discussed. One of the main weaknesses of the simple EBM discussed in this part is its ability to represent the evolution of the top-of-the-atmosphere radiative imbalance in the transient regime. This issue is addressed in Part II by taking into account the efficacy factor of deep-ocean heat uptake.
    publisherAmerican Meteorological Society
    titleTransient Climate Response in a Two-Layer Energy-Balance Model. Part I: Analytical Solution and Parameter Calibration Using CMIP5 AOGCM Experiments
    typeJournal Paper
    journal volume26
    journal issue6
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00195.1
    journal fristpage1841
    journal lastpage1857
    treeJournal of Climate:;2012:;volume( 026 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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