{"id":1564,"date":"2022-03-05T13:03:32","date_gmt":"2022-03-05T05:03:32","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=1564"},"modified":"2022-03-23T14:17:42","modified_gmt":"2022-03-23T06:17:42","slug":"%e9%9c%a7%e6%98%af%e5%a6%82%e4%bd%95%e5%bd%a2%e6%88%90%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e9%9c%a7%e6%98%af%e5%a6%82%e4%bd%95%e5%bd%a2%e6%88%90%e7%9a%84%ef%bc%9f\/","title":{"rendered":"\u9727\u9396\u9999\u6c5f"},"content":{"rendered":"\n

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

踏入春季，天氣漸轉潮濕，今早維多利亞港出現平流霧。 圖：今早維多利亞港的平流霧(來源:香港天文台) 正常情況下，溫度隨高度上升而下降，因此山上氣溫比平地為低，空氣自由上升。冬末春初，太平洋的海洋氣流開始影響華南沿岸，但華南沿岸間中仍受東北季候風影響。由於海洋氣流溫暖潮濕，當高空氣溫較高而地面氣溫較低，我們稱為逆溫層。空氣無法在逆溫層內上升，遇冷時水汽凝結為水滴，就形成霧。而從另一個角度理解，霧可以看成接觸地面的雲。 香港常見的霧主要分為以下幾種： 1. 輻射霧：日落後由於地面降溫，空氣冷卻形成霧。香港的盆地例如沙田、石崗、打鼓嶺等經常在日落後出現輻射霧。在天晴無風的日子，地面降溫加快，有助輻射霧的形成。輻射霧一般厚度不大，在日出或風勢增強後迅速消散。 2. 平流霧：大範圍溫暖潮濕空氣經過較涼的海面或陸地時，空氣冷卻形成霧。香港春天經常受平流霧影響，當東南風或南風經過南中國海北部較涼的海面時，平流霧便形成。平流霧影響範圍較大，影響時間亦較長，可以持續數天。 3. 上坡霧：空氣經過山脈時，受地形影響被抬升，空氣冷卻形成霧。大帽山或鳳凰山的山腰有時會出現一層雲，其實就是空氣被抬升冷卻的結果。 除此之外，還有山谷霧、降雨霧及蒸氣霧等。最近有朋友在遠足時突然遇上下雨，由於雨水較周圍空氣為暖，雨水蒸發令空氣中的水汽飽和形成降雨霧，四周朦朧一片。 天文台的天氣報告中經常使用霧、薄霧和煙霞（內地稱為霾）的術語。當能見度受水滴影響低於1公里及5公里，而相對濕度在80%以上時，我們稱為霧及薄霧。當能見度受懸浮粒子影響，而相對濕度在80%以下時，我們稱為煙霞。<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","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":[44],"tags":[],"class_list":["post-1564","post","type-post","status-publish","format-standard","hentry","category-44"],"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\/1564","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=1564"}],"version-history":[{"count":5,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1564\/revisions"}],"predecessor-version":[{"id":3918,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1564\/revisions\/3918"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=1564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=1564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=1564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}