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    Quantifying the Annular Mode Dynamics in an Idealized Atmosphere

    Source: Journal of the Atmospheric Sciences:;2019:;volume 076:;issue 004::page 1107
    Author:
    Hassanzadeh, Pedram
    ,
    Kuang, Zhiming
    DOI: 10.1175/JAS-D-18-0268.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe linear response function (LRF) of an idealized GCM, the dry dynamical core with Held?Suarez physics, is used to accurately compute how eddy momentum and heat fluxes change in response to the zonal wind and temperature anomalies of the annular mode at the quasi-steady limit. Using these results and knowing the parameterizations of surface friction and thermal radiation in Held?Suarez physics, the contribution of each physical process (meridional and vertical eddy fluxes, surface friction, thermal radiation, and meridional advection) to the annular mode dynamics is quantified. Examining the quasigeostrophic potential vorticity balance, it is shown that the eddy feedback is positive and increases the persistence of the annular mode by a factor of more than 2. Furthermore, how eddy fluxes change in response to only the barotropic component of the annular mode, that is, vertically averaged zonal wind (and no temperature) anomaly, is also calculated similarly. The response of eddy fluxes to the barotropic-only component of the annular mode is found to be drastically different from the response to the full (i.e., barotropic + baroclinic) annular mode anomaly. In the former, the eddy generation is significantly suppressed, leading to a negative eddy feedback that decreases the persistence of the annular mode by nearly a factor of 3. These results suggest that the baroclinic component of the annular mode anomaly, that is, the increased low-level baroclinicity, is essential for the persistence of the annular mode, consistent with the baroclinic mechanism but not the barotropic mechanism proposed in the previous studies.
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      Quantifying the Annular Mode Dynamics in an Idealized Atmosphere

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    contributor authorHassanzadeh, Pedram
    contributor authorKuang, Zhiming
    date accessioned2019-10-05T06:51:25Z
    date available2019-10-05T06:51:25Z
    date copyright2/21/2019 12:00:00 AM
    date issued2019
    identifier otherJAS-D-18-0268.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263638
    description abstractAbstractThe linear response function (LRF) of an idealized GCM, the dry dynamical core with Held?Suarez physics, is used to accurately compute how eddy momentum and heat fluxes change in response to the zonal wind and temperature anomalies of the annular mode at the quasi-steady limit. Using these results and knowing the parameterizations of surface friction and thermal radiation in Held?Suarez physics, the contribution of each physical process (meridional and vertical eddy fluxes, surface friction, thermal radiation, and meridional advection) to the annular mode dynamics is quantified. Examining the quasigeostrophic potential vorticity balance, it is shown that the eddy feedback is positive and increases the persistence of the annular mode by a factor of more than 2. Furthermore, how eddy fluxes change in response to only the barotropic component of the annular mode, that is, vertically averaged zonal wind (and no temperature) anomaly, is also calculated similarly. The response of eddy fluxes to the barotropic-only component of the annular mode is found to be drastically different from the response to the full (i.e., barotropic + baroclinic) annular mode anomaly. In the former, the eddy generation is significantly suppressed, leading to a negative eddy feedback that decreases the persistence of the annular mode by nearly a factor of 3. These results suggest that the baroclinic component of the annular mode anomaly, that is, the increased low-level baroclinicity, is essential for the persistence of the annular mode, consistent with the baroclinic mechanism but not the barotropic mechanism proposed in the previous studies.
    publisherAmerican Meteorological Society
    titleQuantifying the Annular Mode Dynamics in an Idealized Atmosphere
    typeJournal Paper
    journal volume76
    journal issue4
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-18-0268.1
    journal fristpage1107
    journal lastpage1124
    treeJournal of the Atmospheric Sciences:;2019:;volume 076:;issue 004
    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