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    Annular Typhoons in the Western North Pacific

    Source: Weather and Forecasting:;2013:;volume( 029 ):;issue: 002::page 241
    Author:
    Chu, Kekuan
    ,
    Tan, Zhe-Min
    DOI: 10.1175/WAF-D-13-00060.1
    Publisher: American Meteorological Society
    Abstract: nnular hurricanes, characterized by annular structure, are a subset of mature-stage intense tropical cyclones, and they tend to be stronger and persist longer than average tropical cyclones. The characteristics of annular hurricanes in the North Atlantic and eastern-central North Pacific Oceans are well documented by Knaff et al. However, little is known about the annular typhoons in the western North Pacific (WNP). This study investigates the general features of annular typhoons in the WNP based on a 20-yr analysis (1990?2009) of global storm-centered infrared brightness temperature and passive microwave satellite datasets. Similar to annular hurricanes, annular typhoons also only form under a specific combination of environmental conditions, resulting in a quite low occurrence rate (~4%), and only 12 annular typhoons occur during this period. The concentric eyewall replacement is one effective pathway to annular typhoon formation. Three annular typhoons experienced the concentric eyewall replacement within 24 h prior to their annular phases during this period. There are two seedbeds, located east of Taiwan and in the central WNP, for annular typhoon formation within a narrow zonal belt (20°?30°N). The former is conducive to the landfall of annular typhoons, in particular six of the nine annular typhoons that formed in this region eventually made landfall. Because the average time interval between landfall of the annular typhoons and the end of their annular phase is relatively short, about 30 h, they can maintain near-peak intensities and hit the landfalling areas with record intensities. They present a unique threat to eastern Asia but have received little attention from the scientific community so far.
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      Annular Typhoons in the Western North Pacific

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    contributor authorChu, Kekuan
    contributor authorTan, Zhe-Min
    date accessioned2017-06-09T17:36:23Z
    date available2017-06-09T17:36:23Z
    date copyright2014/04/01
    date issued2013
    identifier issn0882-8156
    identifier otherams-87956.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4231682
    description abstractnnular hurricanes, characterized by annular structure, are a subset of mature-stage intense tropical cyclones, and they tend to be stronger and persist longer than average tropical cyclones. The characteristics of annular hurricanes in the North Atlantic and eastern-central North Pacific Oceans are well documented by Knaff et al. However, little is known about the annular typhoons in the western North Pacific (WNP). This study investigates the general features of annular typhoons in the WNP based on a 20-yr analysis (1990?2009) of global storm-centered infrared brightness temperature and passive microwave satellite datasets. Similar to annular hurricanes, annular typhoons also only form under a specific combination of environmental conditions, resulting in a quite low occurrence rate (~4%), and only 12 annular typhoons occur during this period. The concentric eyewall replacement is one effective pathway to annular typhoon formation. Three annular typhoons experienced the concentric eyewall replacement within 24 h prior to their annular phases during this period. There are two seedbeds, located east of Taiwan and in the central WNP, for annular typhoon formation within a narrow zonal belt (20°?30°N). The former is conducive to the landfall of annular typhoons, in particular six of the nine annular typhoons that formed in this region eventually made landfall. Because the average time interval between landfall of the annular typhoons and the end of their annular phase is relatively short, about 30 h, they can maintain near-peak intensities and hit the landfalling areas with record intensities. They present a unique threat to eastern Asia but have received little attention from the scientific community so far.
    publisherAmerican Meteorological Society
    titleAnnular Typhoons in the Western North Pacific
    typeJournal Paper
    journal volume29
    journal issue2
    journal titleWeather and Forecasting
    identifier doi10.1175/WAF-D-13-00060.1
    journal fristpage241
    journal lastpage251
    treeWeather and Forecasting:;2013:;volume( 029 ):;issue: 002
    contenttypeFulltext
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