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    A Theory for the Seasonal Predictability Barrier: Threshold, Timing, and Intensity

    Source: Journal of Climate:;2018:;volume 032:;issue 002::page 423
    Author:
    Liu, Zhengyu
    ,
    Jin, Yishuai
    ,
    Rong, Xinyao
    DOI: 10.1175/JCLI-D-18-0383.1
    Publisher: American Meteorological Society
    Abstract: A theory is developed in a stochastic climate model for understanding the general features of the seasonal predictability barrier (PB), which is characterized by a band of maximum decline in autocorrelation function phase-locked to a particular season. Our theory determines the forcing threshold, timing, and intensity of the seasonal PB as a function of the damping rate and seasonal forcing. A seasonal PB is found to be an intrinsic feature of a stochastic climate system forced by either seasonal growth rate or seasonal noise forcing. A PB is generated when the seasonal forcing, relative to the damping rate, exceeds a modest threshold. Once generated, all the PBs occur in the same calendar month, forming a seasonal PB. The PB season is determined by the decline of the seasonal forcing as well as the delayed response associated with damping. As such, for a realistic weak damping, the PB season is locked close to the minimum SST variance under the seasonal growth-rate forcing, but after the minimum SST variance under the seasonal noise forcing. The intensity of the PB is determined mainly by the amplitude of the seasonal forcing. The theory is able to explain the general features of the seasonal PB of the observed SST variability over the world. In the tropics, a seasonal PB is generated mainly by a strong seasonal growth rate, whereas in the extratropics a seasonal PB is generated mainly by a strong seasonal noise forcing. Our theory provides a general framework for the understanding of the seasonal PB of climate variability.
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      A Theory for the Seasonal Predictability Barrier: Threshold, Timing, and Intensity

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    contributor authorLiu, Zhengyu
    contributor authorJin, Yishuai
    contributor authorRong, Xinyao
    date accessioned2019-09-22T09:02:38Z
    date available2019-09-22T09:02:38Z
    date copyright11/15/2018 12:00:00 AM
    date issued2018
    identifier otherJCLI-D-18-0383.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262439
    description abstractA theory is developed in a stochastic climate model for understanding the general features of the seasonal predictability barrier (PB), which is characterized by a band of maximum decline in autocorrelation function phase-locked to a particular season. Our theory determines the forcing threshold, timing, and intensity of the seasonal PB as a function of the damping rate and seasonal forcing. A seasonal PB is found to be an intrinsic feature of a stochastic climate system forced by either seasonal growth rate or seasonal noise forcing. A PB is generated when the seasonal forcing, relative to the damping rate, exceeds a modest threshold. Once generated, all the PBs occur in the same calendar month, forming a seasonal PB. The PB season is determined by the decline of the seasonal forcing as well as the delayed response associated with damping. As such, for a realistic weak damping, the PB season is locked close to the minimum SST variance under the seasonal growth-rate forcing, but after the minimum SST variance under the seasonal noise forcing. The intensity of the PB is determined mainly by the amplitude of the seasonal forcing. The theory is able to explain the general features of the seasonal PB of the observed SST variability over the world. In the tropics, a seasonal PB is generated mainly by a strong seasonal growth rate, whereas in the extratropics a seasonal PB is generated mainly by a strong seasonal noise forcing. Our theory provides a general framework for the understanding of the seasonal PB of climate variability.
    publisherAmerican Meteorological Society
    titleA Theory for the Seasonal Predictability Barrier: Threshold, Timing, and Intensity
    typeJournal Paper
    journal volume32
    journal issue2
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-18-0383.1
    journal fristpage423
    journal lastpage443
    treeJournal of Climate:;2018:;volume 032:;issue 002
    contenttypeFulltext
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