{"id":599,"date":"2007-01-08T06:00:00","date_gmt":"2007-01-07T22:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=599"},"modified":"2010-11-11T18:22:30","modified_gmt":"2010-11-11T10:22:30","slug":"%e7%82%ba%e7%94%9a%e9%ba%bc%e6%99%9a%e9%96%93%e6%96%b0%e7%95%8c%e8%bc%83%e5%b8%82%e5%8d%80%e7%82%ba%e5%86%b7%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e7%82%ba%e7%94%9a%e9%ba%bc%e6%99%9a%e9%96%93%e6%96%b0%e7%95%8c%e8%bc%83%e5%b8%82%e5%8d%80%e7%82%ba%e5%86%b7%ef%bc%9f\/","title":{"rendered":"\u70ba\u751a\u9ebc\u665a\u9593\u65b0\u754c\u8f03\u5e02\u5340\u70ba\u51b7\uff1f"},"content":{"rendered":"

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2007\u5e741\u67087\u65e5\uff1a\u6674\u3001\u5fae\u98a8<\/p>\n

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

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

2007年1月7日：晴、微風 晚上11時天文台氣溫14度，但荃灣、沙田、大埔、粉嶺只有10-11度，打鼓嶺及北潭涌更只有7度。為何分別這麼大？ 晚間市區氣溫一般比新界為高，除建築物阻擋空氣流通外，構成建築物的混凝土在日間吸收太陽熱量後會於晚間釋放出來，加上城市排出的廢氣，減慢了氣溫下降的速度。 除了香港，其他大城市亦出現這種現象，科學家稱為「熱島效應」（heat island effect ），城市發展令氣溫上升，有如熱源一樣。 在新界及空曠地區，晚間地面熱量以輻射的方式向空中散失。雲和水汽可以保存熱量，因此多雲和潮濕的日子，新界與市區氣溫的差異較小。此外風將地面較冷的空氣與上空較暖的空氣混合，減慢氣溫下降的速度。 但在天晴和微風的晚上，新界氣溫有時會急降至5度或以下，此現象稱為輻射冷卻（radiation cooling），其中以打鼓嶺、北潭涌、石崗及沙田等地最常出現。部分地區四周被山包圍，有利冷空氣積聚。<\/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-599","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\/599","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=599"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/599\/revisions"}],"predecessor-version":[{"id":720,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/599\/revisions\/720"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=599"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}