天氣小觀:再看北極渦旋,是否弱極渦情境 - 颱風討論
By Joseph
at 2019-01-11T12:00
at 2019-01-11T12:00
Table of Contents
天氣小觀:再看北極渦旋,是否弱極渦情境
冬天是科技的季節,首要就是從暖化效應開始看,
最新報導全球暖化速度比我們預期要快很多,
尤其2018年超越2017年,是全球海洋溫度有紀錄以來最高的一年。
因此,再來看北極渦旋的重要性
眾所皆知,平流層的異常可以影響到對流層,
因此,冬季大魔王平流層北極渦旋的強極渦和弱極渦對冬季天氣的影響就很重要:
1. 強極渦極致之前:東亞大槽是增強的,冬季季風偏強,東亞溫度偏低。
強極渦極致之後:東亞大槽依舊偏強,冬季季風偏強,500百帕西風帶偏北氣流:冷。
強極渦極致之後很久(往後近一個月):東亞大槽明顯減弱,東亞溫度回暖。
2. 弱極渦極致之前:東亞大槽明顯增強,地面冷高強大,冬季風異常強勁,溫度負距平。
弱極渦極致之後:東亞地面溫度明顯升高,西北新疆等地明顯降水。
這表示,強極渦不一定要等強度達到巔峰時才將行星波下傳至對流層,發展階段就下傳。
事實上研究指出,平流層異常下傳對流層的大氣動立機制主要有兩種情況,
(1).藉由南北經向大氣環流或大氣平衡機制來影響對流層。
(2).反射對流層上傳的行星波來影響對流層。
因此,強弱極渦產生的大氣現象,用個白話裡解,
1. 北極渦旋茁壯至變身超極北極渦旋,巔峰前後,給予西伯利亞極地冷氣團豐厚的支援。
2. 用對流層西風帶大震盪,行星波傳至平流層打擊極渦強度,換來地面享有溫暖天氣。
最新模式預報,北極渦旋持續減弱,
一週過後北極渦旋竟然減弱到15400米,在隆冬季節顯然異常了。
因此,要觀察是否弱極渦情境了,
從周六起到下周的東亞大槽有明顯增強的趨勢,蒙古冷高壓強度也增強,
因此,如果是弱極渦情境極致展開前,東亞勢必先有冷空氣的侵襲,就看有多冷了。
當然,
後續弱極渦極致展開後,東亞就要明顯溫暖了,
這點後續可以從西北新疆等地區是否明顯降水來觀察。
不過,還有一個變數就是極渦偏離,北極渦旋中心偏離北極的話,也要考慮當地的情況。
即便是弱極渦大環境(情境),北極渦旋偏離北極後,重新配置北極冷凍氣團的支援,
甚至有機會維持槽區。
因此,如果未來朝向冷,那麼不能朝向弱極渦情境,北極渦旋不能再減弱了;
相反,如果未來朝向熱,那麼挨過這兩週的東亞大槽增強,就有機會真暖和。
(以上供參囉)
--
冬天是科技的季節,首要就是從暖化效應開始看,
最新報導全球暖化速度比我們預期要快很多,
尤其2018年超越2017年,是全球海洋溫度有紀錄以來最高的一年。
因此,再來看北極渦旋的重要性
眾所皆知,平流層的異常可以影響到對流層,
因此,冬季大魔王平流層北極渦旋的強極渦和弱極渦對冬季天氣的影響就很重要:
1. 強極渦極致之前:東亞大槽是增強的,冬季季風偏強,東亞溫度偏低。
強極渦極致之後:東亞大槽依舊偏強,冬季季風偏強,500百帕西風帶偏北氣流:冷。
強極渦極致之後很久(往後近一個月):東亞大槽明顯減弱,東亞溫度回暖。
2. 弱極渦極致之前:東亞大槽明顯增強,地面冷高強大,冬季風異常強勁,溫度負距平。
弱極渦極致之後:東亞地面溫度明顯升高,西北新疆等地明顯降水。
這表示,強極渦不一定要等強度達到巔峰時才將行星波下傳至對流層,發展階段就下傳。
事實上研究指出,平流層異常下傳對流層的大氣動立機制主要有兩種情況,
(1).藉由南北經向大氣環流或大氣平衡機制來影響對流層。
(2).反射對流層上傳的行星波來影響對流層。
因此,強弱極渦產生的大氣現象,用個白話裡解,
1. 北極渦旋茁壯至變身超極北極渦旋,巔峰前後,給予西伯利亞極地冷氣團豐厚的支援。
2. 用對流層西風帶大震盪,行星波傳至平流層打擊極渦強度,換來地面享有溫暖天氣。
最新模式預報,北極渦旋持續減弱,
一週過後北極渦旋竟然減弱到15400米,在隆冬季節顯然異常了。
因此,要觀察是否弱極渦情境了,
從周六起到下周的東亞大槽有明顯增強的趨勢,蒙古冷高壓強度也增強,
因此,如果是弱極渦情境極致展開前,東亞勢必先有冷空氣的侵襲,就看有多冷了。
當然,
後續弱極渦極致展開後,東亞就要明顯溫暖了,
這點後續可以從西北新疆等地區是否明顯降水來觀察。
不過,還有一個變數就是極渦偏離,北極渦旋中心偏離北極的話,也要考慮當地的情況。
即便是弱極渦大環境(情境),北極渦旋偏離北極後,重新配置北極冷凍氣團的支援,
甚至有機會維持槽區。
因此,如果未來朝向冷,那麼不能朝向弱極渦情境,北極渦旋不能再減弱了;
相反,如果未來朝向熱,那麼挨過這兩週的東亞大槽增強,就有機會真暖和。
(以上供參囉)
--
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