{"id":1265,"date":"2022-02-23T17:34:05","date_gmt":"2022-02-23T09:34:05","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=1265"},"modified":"2022-03-23T14:19:33","modified_gmt":"2022-03-23T06:19:33","slug":"%e6%bc%ab%e8%ab%87%e7%b5%90%e9%9c%9c","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e6%bc%ab%e8%ab%87%e7%b5%90%e9%9c%9c\/","title":{"rendered":"\u751a\u9ebc\u662f\u971c\u51cd\u8b66\u544a\uff1f"},"content":{"rendered":"\n

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

持續多日的陰雨天氣終於結束，今日轉為天晴乾燥。不過晚間天氣仍然寒冷，天文台更發出了霜凍警告，表示新界北部及高地可能出現結霜。 結霜是因為空氣中的水汽飽和，多餘的水汽直接轉變為冰（稱為凝華，deposition）的現象。天氣乾燥，為甚麼水汽會出現飽和呢？由於空氣在不同溫度下可容納的水汽量並不相同，溫度越高，可以容納的水汽量越多；溫度越低，可以容納的水汽量越少。 我們在天氣報告中聽到的相對濕度，就是現時空氣中水汽量與可以容納的水汽量之比。當冬季季候風佔據華南沿岸後，香港受乾燥的大陸性氣團影響，空氣中水汽量漸趨穩定。當晚間晴朗無雲、風力微弱，新界北部氣溫會下降得非常快（例如北潭涌、打鼓嶺及石崗）。空氣中可以容納的水汽量減少，分母變小，相對濕度便隨之上升，表示輻射冷卻現象正在進行中，並不是儀器出現故障。 隨著氣溫繼續下降，相對濕度逐漸接近100%，空氣的水汽開始出現飽和，我們將相對濕度為100%時之氣溫稱為露點（dew point）。假如露點高於0度，多餘的水汽就會凝結為露（dew）；假如露點等於或低於0度，多餘的水汽就會凝華為霜（frost）。 露和霜一般在地面或接近地面的物件上出現，若物件為深色或金屬（例如私家車車頂），則溫度會更低，露和霜更易形成。由於地面氣溫會較氣象站氣溫為低，因此天文台近年同時公佈打鼓嶺及大帽山的草溫，作為結霜的參考。當草溫接近0度而相對濕度接近100%時，地面就可能出現結霜，天文台便會發出霜凍警告提醒農民注意，以免農作物被凍壞。<\/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-1265","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\/1265","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=1265"}],"version-history":[{"count":9,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1265\/revisions"}],"predecessor-version":[{"id":3920,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1265\/revisions\/3920"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=1265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=1265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=1265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}