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    Subtropical Cyclogenesis over the Central North Pacific

    Source: Weather and Forecasting:;2006:;volume( 021 ):;issue: 002::page 193
    Author:
    Caruso, Steven J.
    ,
    Businger, Steven
    DOI: 10.1175/WAF914.1
    Publisher: American Meteorological Society
    Abstract: The occurrence of subtropical cyclones over the central North Pacific Ocean has a significant impact on Hawaii?s weather and climate. In this study, 70 upper-level lows that formed during the period 1980?2002 are documented. In each case the low became cut off from the polar westerlies south of 30°N over the central Pacific, during the Hawaiian cool season (October?April). The objectives of this research are to document the interannual variability in the occurrence of upper-level lows, to chart the locations of their genesis and their tracks, and to investigate the physical mechanisms important in associated surface development. Significant interannual variability in the occurrence of upper-level lows was found, with evidence suggesting the influence of strong El Niño?Southern Oscillation events on the frequency of subtropical cyclogenesis in this region. Of the 70 upper-level lows, 43 were accompanied by surface cyclogenesis and classified as kona lows. Kona low formation is concentrated to the west-northwest of Hawaii, especially during October and November, whereas lows without surface development are concentrated in the area to the east-northeast of Hawaii. Kona low genesis shifts eastward through the cool season, favoring the area to the east-northeast of Hawaii during February and March, consistent with a shift in the climatological position of the trough aloft during the cool season. Consistent with earlier studies, surface deepening is well correlated with positive vorticity advection by the thermal wind. Static stability and advection of low-level moisture are less well correlated to surface deepening. These results suggest that kona low formation, to first order, is a baroclinic instability that originates in the midlatitudes, and that convection and latent-heat release play a secondary role in surface cyclogenesis.
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      Subtropical Cyclogenesis over the Central North Pacific

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    contributor authorCaruso, Steven J.
    contributor authorBusinger, Steven
    date accessioned2017-06-09T17:35:06Z
    date available2017-06-09T17:35:06Z
    date copyright2006/04/01
    date issued2006
    identifier issn0882-8156
    identifier otherams-87602.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4231290
    description abstractThe occurrence of subtropical cyclones over the central North Pacific Ocean has a significant impact on Hawaii?s weather and climate. In this study, 70 upper-level lows that formed during the period 1980?2002 are documented. In each case the low became cut off from the polar westerlies south of 30°N over the central Pacific, during the Hawaiian cool season (October?April). The objectives of this research are to document the interannual variability in the occurrence of upper-level lows, to chart the locations of their genesis and their tracks, and to investigate the physical mechanisms important in associated surface development. Significant interannual variability in the occurrence of upper-level lows was found, with evidence suggesting the influence of strong El Niño?Southern Oscillation events on the frequency of subtropical cyclogenesis in this region. Of the 70 upper-level lows, 43 were accompanied by surface cyclogenesis and classified as kona lows. Kona low formation is concentrated to the west-northwest of Hawaii, especially during October and November, whereas lows without surface development are concentrated in the area to the east-northeast of Hawaii. Kona low genesis shifts eastward through the cool season, favoring the area to the east-northeast of Hawaii during February and March, consistent with a shift in the climatological position of the trough aloft during the cool season. Consistent with earlier studies, surface deepening is well correlated with positive vorticity advection by the thermal wind. Static stability and advection of low-level moisture are less well correlated to surface deepening. These results suggest that kona low formation, to first order, is a baroclinic instability that originates in the midlatitudes, and that convection and latent-heat release play a secondary role in surface cyclogenesis.
    publisherAmerican Meteorological Society
    titleSubtropical Cyclogenesis over the Central North Pacific
    typeJournal Paper
    journal volume21
    journal issue2
    journal titleWeather and Forecasting
    identifier doi10.1175/WAF914.1
    journal fristpage193
    journal lastpage205
    treeWeather and Forecasting:;2006:;volume( 021 ):;issue: 002
    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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