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    Influence of Mean Flow on the ENSO–Vertical Wind Shear Relationship over the Northern Tropical Atlantic

    Source: Journal of Climate:;2011:;volume( 025 ):;issue: 003::page 858
    Author:
    Zhu, Xiaojie
    ,
    Saravanan, R.
    ,
    Chang, Ping
    DOI: 10.1175/JCLI-D-11-00213.1
    Publisher: American Meteorological Society
    Abstract: ertical wind shear over the tropical Atlantic Ocean plays an important role in mediating hurricane activity. The vertical shear variability over the main development region for Atlantic hurricanes is affected by local factors as well as by the remote influence of the El Niño?Southern Oscillation (ENSO) phenomenon, as indicated by observational and climate modeling analyses. Climate model simulations of the ENSO?shear relationship are compared with observations. It is shown that there is a strong influence of background mean flow on the ENSO?shear relationship, because of the inherently nonlinear nature of vertical wind shear. In particular, the simulation of zonal flow over the tropical Atlantic is shown to play a critical role in how the remote influence of ENSO modulates the shear. Even with realistic simulations of the ENSO-induced westerly anomaly in the upper troposphere, overestimated easterly background flow in the model simulations can alter the relationship between ENSO and vertical wind shear, resulting in decreased vertical wind shear during warm ENSO events. This nonlinear superposition has important implications for the assessment of trends in large-scale environmental factors affecting tropical cyclogenesis in climate change simulations.
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      Influence of Mean Flow on the ENSO–Vertical Wind Shear Relationship over the Northern Tropical Atlantic

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4221681
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    contributor authorZhu, Xiaojie
    contributor authorSaravanan, R.
    contributor authorChang, Ping
    date accessioned2017-06-09T17:04:21Z
    date available2017-06-09T17:04:21Z
    date copyright2012/02/01
    date issued2011
    identifier issn0894-8755
    identifier otherams-78955.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221681
    description abstractertical wind shear over the tropical Atlantic Ocean plays an important role in mediating hurricane activity. The vertical shear variability over the main development region for Atlantic hurricanes is affected by local factors as well as by the remote influence of the El Niño?Southern Oscillation (ENSO) phenomenon, as indicated by observational and climate modeling analyses. Climate model simulations of the ENSO?shear relationship are compared with observations. It is shown that there is a strong influence of background mean flow on the ENSO?shear relationship, because of the inherently nonlinear nature of vertical wind shear. In particular, the simulation of zonal flow over the tropical Atlantic is shown to play a critical role in how the remote influence of ENSO modulates the shear. Even with realistic simulations of the ENSO-induced westerly anomaly in the upper troposphere, overestimated easterly background flow in the model simulations can alter the relationship between ENSO and vertical wind shear, resulting in decreased vertical wind shear during warm ENSO events. This nonlinear superposition has important implications for the assessment of trends in large-scale environmental factors affecting tropical cyclogenesis in climate change simulations.
    publisherAmerican Meteorological Society
    titleInfluence of Mean Flow on the ENSO–Vertical Wind Shear Relationship over the Northern Tropical Atlantic
    typeJournal Paper
    journal volume25
    journal issue3
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-11-00213.1
    journal fristpage858
    journal lastpage864
    treeJournal of Climate:;2011:;volume( 025 ):;issue: 003
    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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