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    Structural Similarities and Differences in Climate Responses to CO2 Increase between Two Perturbed Physics Ensembles

    Source: Journal of Climate:;2010:;volume( 023 ):;issue: 006::page 1392
    Author:
    Yokohata, Tokuta
    ,
    Webb, Mark J.
    ,
    Collins, Matthew
    ,
    Williams, Keith D.
    ,
    Yoshimori, Masakazu
    ,
    Hargreaves, Julia C.
    ,
    Annan, James D.
    DOI: 10.1175/2009JCLI2917.1
    Publisher: American Meteorological Society
    Abstract: The equilibrium climate sensitivity (ECS) of the two perturbed physics ensembles (PPE) generated using structurally different GCMs, Model for Interdisciplinary Research on Climate (MIROC3.2) and the Third Hadley Centre Atmospheric Model with slab ocean (HadSM3), is investigated. A method to quantify the shortwave (SW) cloud feedback by clouds with different cloud-top pressure is developed. It is found that the difference in the ensemble means of the ECS between the two ensembles is mainly caused by differences in the SW low-level cloud feedback. The ensemble mean SW cloud feedback and ECS of the MIROC3.2 ensemble is larger than that of the HadSM3 ensemble. This is likely related to the 1XCO2 low-level cloud albedo of the former being larger than that of the latter. It is also found that the largest contribution to the within-ensemble variation of ECS comes from the SW low-level cloud feedback in both ensembles. The mechanism that causes the within-ensemble variation is different between the two ensembles. In the HadSM3 ensemble, members with large 1XCO2 low-level cloud albedo have large SW cloud feedback and large ECS; ensemble members with large 1XCO2 cloud cover have large negative SW cloud feedback and relatively low ECS. In the MIROC3.2 ensemble, the 1XCO2 low-level cloud albedo is much more tightly constrained, and no relationship is found between it and the cloud feedback. These results indicate that both the parametric uncertainties sampled in PPEs and the structural uncertainties of GCMs are important and worth further investigation.
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      Structural Similarities and Differences in Climate Responses to CO2 Increase between Two Perturbed Physics Ensembles

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    contributor authorYokohata, Tokuta
    contributor authorWebb, Mark J.
    contributor authorCollins, Matthew
    contributor authorWilliams, Keith D.
    contributor authorYoshimori, Masakazu
    contributor authorHargreaves, Julia C.
    contributor authorAnnan, James D.
    date accessioned2017-06-09T16:29:25Z
    date available2017-06-09T16:29:25Z
    date copyright2010/03/01
    date issued2010
    identifier issn0894-8755
    identifier otherams-68799.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4210396
    description abstractThe equilibrium climate sensitivity (ECS) of the two perturbed physics ensembles (PPE) generated using structurally different GCMs, Model for Interdisciplinary Research on Climate (MIROC3.2) and the Third Hadley Centre Atmospheric Model with slab ocean (HadSM3), is investigated. A method to quantify the shortwave (SW) cloud feedback by clouds with different cloud-top pressure is developed. It is found that the difference in the ensemble means of the ECS between the two ensembles is mainly caused by differences in the SW low-level cloud feedback. The ensemble mean SW cloud feedback and ECS of the MIROC3.2 ensemble is larger than that of the HadSM3 ensemble. This is likely related to the 1XCO2 low-level cloud albedo of the former being larger than that of the latter. It is also found that the largest contribution to the within-ensemble variation of ECS comes from the SW low-level cloud feedback in both ensembles. The mechanism that causes the within-ensemble variation is different between the two ensembles. In the HadSM3 ensemble, members with large 1XCO2 low-level cloud albedo have large SW cloud feedback and large ECS; ensemble members with large 1XCO2 cloud cover have large negative SW cloud feedback and relatively low ECS. In the MIROC3.2 ensemble, the 1XCO2 low-level cloud albedo is much more tightly constrained, and no relationship is found between it and the cloud feedback. These results indicate that both the parametric uncertainties sampled in PPEs and the structural uncertainties of GCMs are important and worth further investigation.
    publisherAmerican Meteorological Society
    titleStructural Similarities and Differences in Climate Responses to CO2 Increase between Two Perturbed Physics Ensembles
    typeJournal Paper
    journal volume23
    journal issue6
    journal titleJournal of Climate
    identifier doi10.1175/2009JCLI2917.1
    journal fristpage1392
    journal lastpage1410
    treeJournal of Climate:;2010:;volume( 023 ):;issue: 006
    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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