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{氣象人語} 香港地下天文台 : 幼稚園通識賽 - 春夏秋冬哪個季節有較多閃電 ......?

10/7/2014

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(連結)「春夏秋冬哪個季節有較多閃電?」這是坊間「幼稚園通識問答比賽」的題目。你知道答案嗎?

首先談一下閃電。閃電是大氣中或大氣與地面之間放電的現象,可以分為以下幾種:

雲間閃電(intracloud lightning)
雲對雲閃電(intercloud lightning)
雲對地閃電(cloud-to-ground lightning)

三種閃電以雲對地閃電危險性最大,可以破壞地面的建築物及設施,並造成人命傷亡。

閃電在不穩定的大氣中發生。空氣上升冷卻形成雲滴和雨滴,由於上升氣流猛烈,形成龐大的積雨雲(有如天空之城),並有電荷累積。當正負電荷累積至某個程度時,便會出現放電現象,產生閃電。閃電伴隨高溫令空氣急劇膨脹爆炸,產生的聲音就是雷聲。

图片
要監察閃電的發生,可以利用天文台的雷達影像及閃電定位資訊。當雷達上出現黃色或橙色的區域,代表該區大氣不穩定,有對流活動發展,可能形成閃電。閃電定位資訊更可準確顯示雲間閃電及雲對地閃電出現的時間及位置,誤差約為500米。
不同季節大氣的穩定性不同。

冬季大氣處於穩定狀態,空氣下沉,不利積雨雲形成,因此較少發生閃電。夏天大氣處於條件性不穩定狀態,空氣上升,當條件配合時便會形成積雨雲,發生閃電及大雨。 

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根據天文台記錄,每年閃電的日數介乎30日至70日之間,過去30年的平均約為52日,以四月至九月較多。

八月是閃電最多的月份,平均有11日出現閃電。至於回答哪個季節有較多閃電,我們先要對香港的季節作出定義:

所以,香港的夏季有較多閃電。




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