![\"11\"](\"https:\/\/i0.wp.com\/www.weather.org.hk\/blog\/wp-content\/uploads\/2021\/01\/11.jpg\")
<\/a><\/p>\n\u51dd\u7d50\u5c3e\u8de1\u5728\u9999\u6e2f\u4e26\u4e0d\u7f55\u898b\uff0c\u5c6c\u65bc\u9ad8\u96f2\u7684\u4e00\u7a2e\u3002\u96f2\u7684\u5f62\u6210\u9700\u8981\u6709\u6f6e\u6fd5\u7a7a\u6c23\uff0c\u4f46\u4ecd\u9700\u8981\u6709\u51dd\u7d50\u6838\uff08condensation nucleii\uff09\u7684\u5b58\u5728\uff0c\u7576\u7a7a\u6c23\u51b7\u537b\u6642\uff0c\u6c34\u6c7d\u53ef\u4ee5\u4f9d\u9644\u5728\u51dd\u7d50\u6838\u4e0a\u8b8a\u70ba\u6c34\u6ef4\u6216\u51b0\u6676\uff0c\u624d\u6210\u70ba\u96f2\u3002<\/p>\n
\u5728\u5929\u6c23\u6674\u6717\u4f46\u9ad8\u7a7a\u5bd2\u51b7\u6f6e\u6fd5\u7684\u74b0\u5883\u4e0b\uff0c\u7576\u98db\u6a5f\u7d93\u904e\uff0c\u5c3e\u90e8\u5674\u51fa\u71b1\u6c23\u6d41\u53ca\u71c3\u71d2\u7522\u751f\u7684\u5fae\u7c92\uff0c\u6c23\u6d41\u9047\u5230\u5bd2\u51b7\u7684\u74b0\u5883\uff0c\u6c34\u6c7d\u5373\u6642\u51dd\u83ef\uff08\u7531\u6c23\u9ad4\u76f4\u63a5\u8b8a\u70ba\u56fa\u9ad4\uff09\u4e26\u5728\u5fae\u7c92\u4e0a\u8b8a\u70ba\u51b0\u6676\uff0c\u51fa\u73fe\u4e00\u689d\u8ecc\u8de1\uff0c\u5c31\u662f\u51dd\u7d50\u5c3e\u8de1\u6216\u98db\u6a5f\u96f2\u3002<\/p>\n
\u51dd\u7d50\u5c3e\u8de1\u4e26\u4e0d\u662f\u7159\uff0c\u53ef\u4ee5\u5728\u5929\u7a7a\u6301\u7e8c\u4e00\u6bb5\u6642\u9593\u751a\u81f3\u6578\u5c0f\u6642\uff0c\u4f46\u6703\u53d7\u9ad8\u7a7a\u98a8\u5f71\u97ff\u51fa\u73fe\u5f62\u72c0\u6539\u8b8a\u3002\u8d77\u521d\u53ea\u662f\u4e00\u689d\u5e7c\u9577\u96f2\u5e36\uff0c\u5047\u5982\u7a7a\u6c23\u6301\u7e8c\u6f6e\u6fd5\uff0c\u96f2\u5e36\u6703\u6162\u6162\u767c\u5c55\u3001\u64f4\u95ca\uff0c\u751a\u81f3\u8207\u5176\u4ed6\u51dd\u7d50\u5c3e\u8de1\u5408\u4f75\uff0c\u5f62\u6210\u5377\u96f2\uff08cirrus\uff09\u3002\u5047\u5982\u7576\u6642\u592a\u967d\u89d2\u5ea6\u8f03\u4f4e\uff0c\u592a\u967d\u5149\u5c04\u9032\u5377\u96f2\u6642\u6703\u51fa\u73fe\u5149\u9ede\u6216\u985e\u4f3c\u5f69\u8679\u7684\u4e03\u8272\u5149\u5e36\uff0c\u7a31\u70ba\u5e7b\u65e5\uff08sundog\uff09\u6216\u74b0\u5929\u9802\u5f27\uff08circumzenithal arc\uff09\uff0c\u9019\u4e9b\u73fe\u8c61\u6628\u5929\u4ea6\u6709\u767c\u751f\u3002<\/p>\n
\u51dd\u7d50\u5c3e\u8de1\u7684\u51fa\u73fe\u6709\u6642\u662f\u5929\u6c23\u8f49\u8b8a\u7684\u5148\u5146\u3002\u7531\u65bc\u9ad8\u7a7a\u5929\u6c23\u4e0d\u7a69\u5b9a\uff0c\u5377\u96f2\u6162\u6162\u767c\u5c55\u4e26\u8986\u84cb\u5929\u7a7a\uff0c\u8f49\u5316\u70ba\u5377\u5c64\u96f2\uff08cirrostratus\uff09\uff0c\u96f2\u5e95\u9010\u6f38\u964d\u4f4e\uff0c\u5377\u5c64\u96f2\u518d\u8f49\u5316\u70ba\u9ad8\u5c64\u96f2\uff08altostratus\uff09\u3002\u7531\u65bc\u9ad8\u5c64\u96f2\u8f03\u539a\uff0c\u628a\u592a\u967d\u6216\u6708\u4eae\u906e\u853d\uff0c\u6674\u6717\u5929\u6c23\u56e0\u800c\u7d50\u675f\u3002<\/p>\n
\u4e0d\u904e\uff0c\u4ea6\u6709\u9670\u8b00\u8ad6\u8a8d\u70ba\uff0c\u51dd\u7d50\u5c3e\u8de1\u5176\u5be6\u662f\u5316\u5b78\u5c3e\u8de1\uff08chemical trail\/chemtrail\uff09\uff0c\u662f\u653f\u5e9c\u6216\u8ecd\u968a\u5728\u7a7a\u4e2d\u5674\u5c04\u5316\u5b78\u7269\u8cea\uff0c\u4f01\u5716\u6539\u8b8a\u5929\u6c23\u3001\u6539\u5584\u8fb2\u4f5c\u7269\u751f\u9577\u751a\u81f3\u5f71\u97ff\u4eba\u985e\u6d3b\u52d5\u3002\u81f3\u65bc\u662f\u5426\u5c6c\u5be6\uff0c\u4ecd\u7136\u773e\u8aaa\u7d1b\u7d1c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
天空中有時會出現一條甚至不同方向的線條，像煙一般，不少市民會拍攝並上載至社交網站分享。這些線條其實是雲的一種，稱為凝結尾跡（condensation trail\/contrail）或飛機雲。 凝結尾跡在香港並不罕見，屬於高雲的一種。雲的形成需要有潮濕空氣，但仍需要有凝結核（condensation nucleii）的存在，當空氣冷卻時，水汽可以依附在凝結核上變為水滴或冰晶，才成為雲。 在天氣晴朗但高空寒冷潮濕的環境下，當飛機經過，尾部噴出熱氣流及燃燒產生的微粒，氣流遇到寒冷的環境，水汽即時凝華（由氣體直接變為固體）並在微粒上變為冰晶，出現一條軌跡，就是凝結尾跡或飛機雲。 凝結尾跡並不是煙，可以在天空持續一段時間甚至數小時，但會受高空風影響出現形狀改變。起初只是一條幼長雲帶，假如空氣持續潮濕，雲帶會慢慢發展、擴闊，甚至與其他凝結尾跡合併，形成卷雲（cirrus）。假如當時太陽角度較低，太陽光射進卷雲時會出現光點或類似彩虹的七色光帶，稱為幻日（sundog）或環天頂弧（circumzenithal arc），這些現象昨天亦有發生。 凝結尾跡的出現有時是天氣轉變的先兆。由於高空天氣不穩定，卷雲慢慢發展並覆蓋天空，轉化為卷層雲（cirrostratus），雲底逐漸降低，卷層雲再轉化為高層雲（altostratus）。由於高層雲較厚，把太陽或月亮遮蔽，晴朗天氣因而結束。 不過，亦有陰謀論認為，凝結尾跡其實是化學尾跡（chemical trail\/chemtrail），是政府或軍隊在空中噴射化學物質，企圖改變天氣、改善農作物生長甚至影響人類活動。至於是否屬實，仍然眾說紛紜。<\/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":[50],"tags":[],"class_list":["post-1556","post","type-post","status-publish","format-standard","hentry","category-50"],"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\/1556","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=1556"}],"version-history":[{"count":7,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1556\/revisions"}],"predecessor-version":[{"id":3045,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1556\/revisions\/3045"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=1556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=1556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=1556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}