天氣小觀:夏季系統明晚減弱,冬季系統明晚增強 - 颱風討論
By Heather
at 2021-10-13T14:54
at 2021-10-13T14:54
Table of Contents
這兩天的南北大氣環境重大改變,
圓規颱風+大季風環流和南亞高壓真所謂魚幫水,水幫魚;
先是南亞高壓的熱帶東風噴流提供輻散讓圓規增強,
後有,
圓規颱風+大季風環流的高空輻散再創一道北北東的熱帶高空噴流,
今天東部的強降雨就是高空場的北北東風噴流位於台灣東方海面,
高層噴流的右後方就是台灣東方近海,搭配低層東南風,
東南風比昨天弱些,表示低層噴流減弱,但高空輻散場更佳,
因此,
台灣東方近海一直有對流胞發展隨著東南風帶進台灣東部尤其花東。
以古觀之氣象,
圓規帶有癸水,水生木,癸水生乙木風(噴流)。
不過,對夏季系統而言,夕陽無限好,只是近黃昏。
明晚起,
蒙古高壓開始堆積,大西風槽準備大砍太平洋高壓脊,猶如金砍木;
同時高空西風噴流南壓,夏季系統暖高壓節節敗退。
台灣東部雨勢也會緩和下來
只是,
可能是等太久了,
週末的冬季系統進攻的態勢非常強烈,
西風大槽壓得太平洋高壓一口氣退到20度以南。
夏季系統節節敗退的原因,當然和北極渦旋快速增強有關了,
北極渦旋中心位於北亞新地島附近高空,
中心百帕高度場從10/6的15800米,到今天10/13的15600米,
一週內連增強兩級,想像1天內,980百帕氣旋變960百帕氣旋。
這種屬於快速增強的過程中,北極高空出現的高位溫,
使得等位溫面從北極高空往中緯度低空傾斜,如此一來,
北極氣團就沿著等位溫面空降到較低緯度的南方,
而,
從北極空降而下的冷凍氣團,西伯利亞大槽順勢轉直,
因此,
有了北極氣團加持,這次鋪天蓋地到南方的冷空氣規模龐大,
冷高壓接力南下,彷彿入冬大氣環境,
即便溫暖的南方->如台灣,降溫也持續而明顯。
看來,下週起,
墨藍的夜空下,只有懂得落葉的人,無眠。
(以上供參囉)
--
圓規颱風+大季風環流和南亞高壓真所謂魚幫水,水幫魚;
先是南亞高壓的熱帶東風噴流提供輻散讓圓規增強,
後有,
圓規颱風+大季風環流的高空輻散再創一道北北東的熱帶高空噴流,
今天東部的強降雨就是高空場的北北東風噴流位於台灣東方海面,
高層噴流的右後方就是台灣東方近海,搭配低層東南風,
東南風比昨天弱些,表示低層噴流減弱,但高空輻散場更佳,
因此,
台灣東方近海一直有對流胞發展隨著東南風帶進台灣東部尤其花東。
以古觀之氣象,
圓規帶有癸水,水生木,癸水生乙木風(噴流)。
不過,對夏季系統而言,夕陽無限好,只是近黃昏。
明晚起,
蒙古高壓開始堆積,大西風槽準備大砍太平洋高壓脊,猶如金砍木;
同時高空西風噴流南壓,夏季系統暖高壓節節敗退。
台灣東部雨勢也會緩和下來
只是,
可能是等太久了,
週末的冬季系統進攻的態勢非常強烈,
西風大槽壓得太平洋高壓一口氣退到20度以南。
夏季系統節節敗退的原因,當然和北極渦旋快速增強有關了,
北極渦旋中心位於北亞新地島附近高空,
中心百帕高度場從10/6的15800米,到今天10/13的15600米,
一週內連增強兩級,想像1天內,980百帕氣旋變960百帕氣旋。
這種屬於快速增強的過程中,北極高空出現的高位溫,
使得等位溫面從北極高空往中緯度低空傾斜,如此一來,
北極氣團就沿著等位溫面空降到較低緯度的南方,
而,
從北極空降而下的冷凍氣團,西伯利亞大槽順勢轉直,
因此,
有了北極氣團加持,這次鋪天蓋地到南方的冷空氣規模龐大,
冷高壓接力南下,彷彿入冬大氣環境,
即便溫暖的南方->如台灣,降溫也持續而明顯。
看來,下週起,
墨藍的夜空下,只有懂得落葉的人,無眠。
(以上供參囉)
--
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