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    Two Leading ENSO Modes and El Niño Types in the Zebiak–Cane Model

    Source: Journal of Climate:;2017:;volume 031:;issue 005::page 1943
    Author:
    Xie, Ruihuang
    ,
    Jin, Fei-Fei
    DOI: 10.1175/JCLI-D-17-0469.1
    Publisher: American Meteorological Society
    Abstract: AbstractModern instrumental records reveal that El Niño events differ in their spatial patterns and temporal evolutions. Attempts have been made to categorize them roughly into two main types: eastern Pacific (EP; or cold tongue) and central Pacific (CP; or warm pool) El Niño events. In this study, a modified version of the Zebiak?Cane (MZC) coupled model is used to examine the dynamics of these two types of El Niño events. Linear eigenanalysis of the model is conducted to show that there are two leading El Niño?Southern Oscillation (ENSO) modes with their SST patterns resembling those of two types of El Niño. Thus, they are referred to as the EP and CP ENSO modes. These two modes are sensitive to changes in the mean states. The heat budget analyses demonstrate that the EP (CP) mode is dominated by thermocline (zonal advective) feedback. Therefore, the weak (strong) mean wind stress and deep (shallow) mean thermocline prefer the EP (CP) ENSO mode because of the relative dominance of thermocline (zonal advective) feedback under such a mean state. Consistent with the linear stability analysis, the occurrence ratio of CP/EP El Niño events in the nonlinear simulations generally increases toward the regime where the linear CP ENSO mode has relatively higher growth rate. These analyses suggest that the coexistence of two leading ENSO modes is responsible for two types of El Niño simulated in the MZC model. This model result may provide a plausible scenario for the observed ENSO diversity.
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      Two Leading ENSO Modes and El Niño Types in the Zebiak–Cane Model

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    contributor authorXie, Ruihuang
    contributor authorJin, Fei-Fei
    date accessioned2019-09-19T10:09:31Z
    date available2019-09-19T10:09:31Z
    date copyright12/21/2017 12:00:00 AM
    date issued2017
    identifier otherjcli-d-17-0469.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262187
    description abstractAbstractModern instrumental records reveal that El Niño events differ in their spatial patterns and temporal evolutions. Attempts have been made to categorize them roughly into two main types: eastern Pacific (EP; or cold tongue) and central Pacific (CP; or warm pool) El Niño events. In this study, a modified version of the Zebiak?Cane (MZC) coupled model is used to examine the dynamics of these two types of El Niño events. Linear eigenanalysis of the model is conducted to show that there are two leading El Niño?Southern Oscillation (ENSO) modes with their SST patterns resembling those of two types of El Niño. Thus, they are referred to as the EP and CP ENSO modes. These two modes are sensitive to changes in the mean states. The heat budget analyses demonstrate that the EP (CP) mode is dominated by thermocline (zonal advective) feedback. Therefore, the weak (strong) mean wind stress and deep (shallow) mean thermocline prefer the EP (CP) ENSO mode because of the relative dominance of thermocline (zonal advective) feedback under such a mean state. Consistent with the linear stability analysis, the occurrence ratio of CP/EP El Niño events in the nonlinear simulations generally increases toward the regime where the linear CP ENSO mode has relatively higher growth rate. These analyses suggest that the coexistence of two leading ENSO modes is responsible for two types of El Niño simulated in the MZC model. This model result may provide a plausible scenario for the observed ENSO diversity.
    publisherAmerican Meteorological Society
    titleTwo Leading ENSO Modes and El Niño Types in the Zebiak–Cane Model
    typeJournal Paper
    journal volume31
    journal issue5
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-17-0469.1
    journal fristpage1943
    journal lastpage1962
    treeJournal of Climate:;2017:;volume 031:;issue 005
    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
    yabeshDSpacePersian