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In meteorology, eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, generally with winds greater than 185 km/h (115 mph), or major hurricanes (Category 3 or above). When tropical cyclones reach this intensity, and the eyewall contracts or is already sufficiently small, some of the outer rainbands may strengthen and organize into a ring of thunderstorms—a new, outer eyewall—that slowly moves inward and robs the original, inner eyewall of its needed moisture and angular momentum. Since the strongest winds are in a tropical cyclone's eyewall, the storm usually weakens during this phase, as the inner wall is "choked" by the outer wall. Eventually the outer eyewall replaces the inner one completely, and the storm may re-intensify.

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  • Zyklische Eyewall-Neubildungen (engl. eyewall replacement cycles) ereignen sich meist in starken tropischen Wirbelstürmen der Kategorie 3 und mehr auf der Saffir-Simpson-Hurrikan-Windskala. Wenn tropische Wirbelstürme diese Stärke erreichen und die Eyewall kontrahiert bzw. klein genug ist, kann es passieren, dass sich einige der äußeren Regenbänder verstärken und einen zweiten Ring starker Gewitter (also eine zweite Eyewall) um das Zentrum des Sturms bilden. Diese bewegt sich langsam in Richtung Zentrum und entzieht der inneren Eyewall damit wichtige Feuchtigkeit und vor allem den Drehimpuls. Da die stärksten Winde eines tropischen Wirbelsturms in der Eyewall liegen, schwächt sich diese während des Zyklus ab. Wenn der Zyklus jedoch komplett ist und die äußere Eyewall die innere ersetzt hat, kann sich der Sturm wieder intensivieren. Mit der so erhaltenen neuen, größeren Eyewall wird das Windfeld des Sturmes ebenfalls größer. Die meisten starken tropischen Wirbelstürme durchlaufen mindestens einen solchen Zyklus, dabei kann die Stärke des Sturmes stark schwanken. (de)
  • In meteorology, eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, generally with winds greater than 185 km/h (115 mph), or major hurricanes (Category 3 or above). When tropical cyclones reach this intensity, and the eyewall contracts or is already sufficiently small, some of the outer rainbands may strengthen and organize into a ring of thunderstorms—a new, outer eyewall—that slowly moves inward and robs the original, inner eyewall of its needed moisture and angular momentum. Since the strongest winds are in a tropical cyclone's eyewall, the storm usually weakens during this phase, as the inner wall is "choked" by the outer wall. Eventually the outer eyewall replaces the inner one completely, and the storm may re-intensify. The discovery of this process was partially responsible for the end of the U.S. government's hurricane modification experiment Project Stormfury. This project set out to seed clouds outside the eyewall, apparently causing a new eyewall to form and weakening the storm. When it was discovered that this was a natural process due to hurricane dynamics, the project was quickly abandoned. Almost every intense hurricane undergoes at least one of these cycles during its existence. Recent studies have shown that nearly half of all tropical cyclones, and nearly all cyclones with sustained winds over 204 kilometres per hour (127 mph; 110 kn), undergo eyewall replacement cycles. Hurricane Allen in 1980 went through repeated eyewall replacement cycles, fluctuating between Category 5 and Category 4 status on the Saffir-Simpson Hurricane Scale several times. Typhoon June (1975) was the first reported case of triple eyewalls, and Hurricane Juliette (2001) was a documented case of such. (en)
  • Os ciclos de substituição da parede do olho, (em inglês Eyewall replacement cycle), ocorrem naturalmente em ciclones tropicais intensos, geralmente com ventos superiores a 185 km/h (115 mph) ou grandes furacões ( categoria 3 ou superior). Quando os ciclones tropicais atingem essa intensidade e a parede dos olhos se contrai ou já é suficientemente pequena, algumas das bandas de chuva externas podem fortalecer-se e organizar-se num anel de tempestades - uma parede de olhos externa - que se move lentamente para dentro e rouba a parede de olho da humidade necessária e momento angular. Como os ventos mais fortes estão na parede ocular de um ciclone, o ciclone tropical geralmente enfraquece durante esta fase, pois a parede interna é "sufocada" pela parede externa. Eventualmente, a parede ocular externa substitui completamente a interna, e a tempestade pode se intensificar. A descoberta desse processo foi parcialmente responsável pelo fim da experiência de modificação de furacões do governo dos EUA, o Projeto Stormfury. Este projeto partiu para semear nuvens fora da parede dos olhos, aparentemente causando uma nova parede dos olhos e enfraquecendo a tempestade. Quando se descobriu que esse era um processo natural devido à dinâmica dos furacões, o projeto foi rapidamente abandonado. Quase todo furacão intenso passa por pelo menos um desses ciclos durante a sua existência. Estudos recentes mostraram que quase metade de todos os ciclones tropicais e quase todos os ciclones com ventos sustentados acima de 204 km/h (127 mph; 110 kn), passam por ciclos de substituição da parede ocular. O furacão Allen, em 1980, passou por repetidos ciclos de substituição da parede ocular, flutuando várias vezes entre categoria 5 e categoria 4 na escala Saffir-Simpson. O Tufão June (1975) foi o primeiro caso relatado de paredes triplas dos olhos, e Hurricane Juliette (2001) foi um caso documentado disso. (pt)
  • 眼牆置換循環(英語:Eyewall replacement cycle),又稱為眼壁更替週期,是一種發生於熱帶氣旋中心的現象,在原眼牆外,形成新眼壁,並逐步移入中心,取代舊有的內眼壁。眼牆置換一般會發生於強烈的熱帶氣旋,一般發生在接近中心最高持續風速大於185公里每小時(115英里每小時)的熱帶氣旋,亦即發展非常成熟之颱風或颶風,相當於中國國家氣象中心和香港天文台之超強颱風、臺灣中央氣象局之強烈颱風、薩菲爾-辛普森颶風等級之三級颶風(大型颶風)或以上級別。 熱帶氣旋在出現「眼牆置換循環」前,首先會發展出多個眼牆的結構(如雙眼牆)。一個外眼壁在中心密集雲團形成,並緩慢收縮,逐漸奪走舊有內眼壁繼續保持所需要的水分和角動量。因為熱帶氣旋的眼牆風力最大,所以在眼牆置換的過程中熱帶氣旋通常會減弱。內眼壁逐漸被外眼壁「扼殺」,最終內眼壁將會消失,外眼壁則繼續收緊。 眼牆置換循環中出現的不一定只有雙眼牆,甚至曾經有熱帶氣旋出現過不只兩層眼牆的颶風,例如2001年出現「三眼牆」(三重眼壁),但他仍會先後合併為雙眼牆,內層眼牆終將消失,完成眼牆置換循環。 (zh)
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  • 眼牆置換循環(英語:Eyewall replacement cycle),又稱為眼壁更替週期,是一種發生於熱帶氣旋中心的現象,在原眼牆外,形成新眼壁,並逐步移入中心,取代舊有的內眼壁。眼牆置換一般會發生於強烈的熱帶氣旋,一般發生在接近中心最高持續風速大於185公里每小時(115英里每小時)的熱帶氣旋,亦即發展非常成熟之颱風或颶風,相當於中國國家氣象中心和香港天文台之超強颱風、臺灣中央氣象局之強烈颱風、薩菲爾-辛普森颶風等級之三級颶風(大型颶風)或以上級別。 熱帶氣旋在出現「眼牆置換循環」前,首先會發展出多個眼牆的結構(如雙眼牆)。一個外眼壁在中心密集雲團形成,並緩慢收縮,逐漸奪走舊有內眼壁繼續保持所需要的水分和角動量。因為熱帶氣旋的眼牆風力最大,所以在眼牆置換的過程中熱帶氣旋通常會減弱。內眼壁逐漸被外眼壁「扼殺」,最終內眼壁將會消失,外眼壁則繼續收緊。 眼牆置換循環中出現的不一定只有雙眼牆,甚至曾經有熱帶氣旋出現過不只兩層眼牆的颶風,例如2001年出現「三眼牆」(三重眼壁),但他仍會先後合併為雙眼牆,內層眼牆終將消失,完成眼牆置換循環。 (zh)
  • Zyklische Eyewall-Neubildungen (engl. eyewall replacement cycles) ereignen sich meist in starken tropischen Wirbelstürmen der Kategorie 3 und mehr auf der Saffir-Simpson-Hurrikan-Windskala. Wenn tropische Wirbelstürme diese Stärke erreichen und die Eyewall kontrahiert bzw. klein genug ist, kann es passieren, dass sich einige der äußeren Regenbänder verstärken und einen zweiten Ring starker Gewitter (also eine zweite Eyewall) um das Zentrum des Sturms bilden. Diese bewegt sich langsam in Richtung Zentrum und entzieht der inneren Eyewall damit wichtige Feuchtigkeit und vor allem den Drehimpuls. Da die stärksten Winde eines tropischen Wirbelsturms in der Eyewall liegen, schwächt sich diese während des Zyklus ab. Wenn der Zyklus jedoch komplett ist und die äußere Eyewall die innere ersetzt hat (de)
  • In meteorology, eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, generally with winds greater than 185 km/h (115 mph), or major hurricanes (Category 3 or above). When tropical cyclones reach this intensity, and the eyewall contracts or is already sufficiently small, some of the outer rainbands may strengthen and organize into a ring of thunderstorms—a new, outer eyewall—that slowly moves inward and robs the original, inner eyewall of its needed moisture and angular momentum. Since the strongest winds are in a tropical cyclone's eyewall, the storm usually weakens during this phase, as the inner wall is "choked" by the outer wall. Eventually the outer eyewall replaces the inner one completely, and the storm may re-intensify. (en)
  • Os ciclos de substituição da parede do olho, (em inglês Eyewall replacement cycle), ocorrem naturalmente em ciclones tropicais intensos, geralmente com ventos superiores a 185 km/h (115 mph) ou grandes furacões ( categoria 3 ou superior). Quando os ciclones tropicais atingem essa intensidade e a parede dos olhos se contrai ou já é suficientemente pequena, algumas das bandas de chuva externas podem fortalecer-se e organizar-se num anel de tempestades - uma parede de olhos externa - que se move lentamente para dentro e rouba a parede de olho da humidade necessária e momento angular. Como os ventos mais fortes estão na parede ocular de um ciclone, o ciclone tropical geralmente enfraquece durante esta fase, pois a parede interna é "sufocada" pela parede externa. Eventualmente, a parede ocular (pt)
rdfs:label
  • Zyklische Eyewall-Neubildung (de)
  • Eyewall replacement cycle (en)
  • Ciclos de reposição da parede do olho (pt)
  • 眼牆置換循環 (zh)
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