{"id":583,"date":"2006-08-22T05:00:00","date_gmt":"2006-08-21T21:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=583"},"modified":"2010-11-11T18:24:45","modified_gmt":"2010-11-11T10:24:45","slug":"%e8%a1%9b%e6%98%9f%e9%9b%b2%e5%9c%96%e7%9c%8b%e8%97%a4%e5%8e%9f%e6%95%88%e6%87%89","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e8%a1%9b%e6%98%9f%e9%9b%b2%e5%9c%96%e7%9c%8b%e8%97%a4%e5%8e%9f%e6%95%88%e6%87%89\/","title":{"rendered":"\u885b\u661f\u96f2\u5716\u770b\u85e4\u539f\u6548\u61c9"},"content":{"rendered":"

\t\t\t\t\t\t\t\t\t<\/p>\n

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\"Picture\"<\/a><\/p>\n

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<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

藤原效應（Fujiwhara Effect）是兩個熱帶氣旋圍繞一個假想的中心點旋轉的現象。理論歸理論，讓我們在衛星雲圖上看看。 早前桑美和寶霞一對「雙颱風」成為新聞話題，或說兩個颱風會相撞、或說會結合成超級颱風，台灣傳媒更說成「再續生死戀」，笑話連篇。西北太平洋是全球熱帶氣旋活動最頻密的地區，雙颱風甚至三颱風並非罕見（最高紀錄是五個）。 其實桑美和寶霞後有另一對「雙颱風」悟空和清松，只因未影響中國沿岸，因此未被報道。這對雙颱風的結局是：清松以反時針圍繞悟空旋轉，最後在悟空的環流內消散，悟空登陸日本九州。 以下是清松生命史最後數小時的衛星雲圖。紅點是悟空的中心位置（參考美國聯合颱風警報中心定位），黃點是清松的中心位置，可清楚看到反時針旋轉： 簡單而言，藤原效應可看成社交舞中的男伴和女伴，女伴圍繞男伴旋轉。假於男伴不動，女伴旋轉的路徑較易預測。假於男伴同時運動，旋轉路徑就多了一個變數。女伴旋轉的速度就看雙方體重（即熱帶氣旋的強度）相差多少，輕盈的女伴當然轉得較快。 （本文中「颱風」泛指任何強度之熱帶氣旋。當海洋上同時出現多個熱帶氣旋時，由於能量守衡，熱帶氣旋未必可達颱風強度。）<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4],"tags":[],"class_list":["post-583","post","type-post","status-publish","format-standard","hentry","category-4"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/comments?post=583"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/583\/revisions"}],"predecessor-version":[{"id":736,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/583\/revisions\/736"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}