本港即將踏入初夏,我們趁機回顧快將逝去的2023年春季之壯麗景色。有觀眾2.11下午3時許在東涌拍攝到「山帽雲」,猶如Blanket蓋在山脈。至於看似Carpet的「平流霧」,天文台的戶外鏡頭在1月中亦捕捉到「霧海」覆蓋維港,相當壯觀。
當濕暖氣流吹過山脈,水汽沿山坡抬升並冷卻,凝結成山帽雲(Cap Cloud),故屬地形雲。天文台指,按世界氣象組織分類,山帽雲可歸類為「莢狀層積雲」。觀眾在2.11下午拍攝到的山帽雲,正是濕暖偏東氣流吹過大嶼山脈所致。
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當濕暖氣流遇上沿岸較涼海面,水汽凝結為小水珠,形成平流霧(Advection Fog),又稱海霧,故常見於香港初春,但2023年卻提早至1月中亮相。而當低空有「逆溫層」,霧只能在其下方形成;若加上風勢微弱,更難消散,大家則較容易在高處持續看見霧海。
天氣師李鈺廷科普冷知識
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