天氣小觀:第二波寒流模式今起三天 - 颱風討論
By Puput
at 2022-12-23T11:11
at 2022-12-23T11:11
Table of Contents
在冷高壓接力下,昨天新制台北測站寒流達標,
今早台北測站也10度以下,可說第二波寒流正式啟動了,
不過因為乾燥顯然比下雨舒服許多。
模式預報第二波寒流以輻射冷卻加持下,週末連冷三天。
目前中亞脊東移與東西伯利亞海的高空暖高壓試圖連結,
因此東北亞高空冷渦旋順勢延伸出西風槽轉直,
帶出第二波東亞寒潮,
但由於北極渦旋回到北極重新蓄力,
因此,模式未來一週東西伯利亞海的西伯利亞暖高壓會被削減,
中高緯度的西風帶重新回歸西風急流的運作。
值得注意的是,
GFS預報北極渦旋回歸北極後衝到百帕高度場14900米的超級渦旋
如此一來,就要留意強極渦事件了;
北方高空大氣向南方地面傳送就是沿著等位溫面移動,
強極渦:等位溫面在北極地區比較高,向中緯度向下傾斜。
弱極渦:等位溫面在北極地區比較低,向中緯度向上傾斜。
因此強極渦情境,北極平流層高位渦冷空氣支援中緯度。
對比弱極渦情境,北極平流層高位渦冷空氣不支援中緯度。
冬季北極非常嚴寒,對流層很低,因此平流層增厚,等位溫面高度很高,
強極渦事件就要留意,北極渦旋空投冷凍氣團。
事實上,
GFS已經預報一週過後北極渦旋開始對南方空投冷凍氣團,
但主要是對北美大量空投,因此1月初美國要留意冰風暴。
當然,這不是入冬首波了(之前已經有一股);
但強極渦事件對南方的後遺症很大,因為冷很久。
但是否強極渦事件往東亞發酵,
因時間還久,且目前模式首投北美,暫時不用管嚕。
(較忙快速說說,以上供參也)
--
今早台北測站也10度以下,可說第二波寒流正式啟動了,
不過因為乾燥顯然比下雨舒服許多。
模式預報第二波寒流以輻射冷卻加持下,週末連冷三天。
目前中亞脊東移與東西伯利亞海的高空暖高壓試圖連結,
因此東北亞高空冷渦旋順勢延伸出西風槽轉直,
帶出第二波東亞寒潮,
但由於北極渦旋回到北極重新蓄力,
因此,模式未來一週東西伯利亞海的西伯利亞暖高壓會被削減,
中高緯度的西風帶重新回歸西風急流的運作。
值得注意的是,
GFS預報北極渦旋回歸北極後衝到百帕高度場14900米的超級渦旋
如此一來,就要留意強極渦事件了;
北方高空大氣向南方地面傳送就是沿著等位溫面移動,
強極渦:等位溫面在北極地區比較高,向中緯度向下傾斜。
弱極渦:等位溫面在北極地區比較低,向中緯度向上傾斜。
因此強極渦情境,北極平流層高位渦冷空氣支援中緯度。
對比弱極渦情境,北極平流層高位渦冷空氣不支援中緯度。
冬季北極非常嚴寒,對流層很低,因此平流層增厚,等位溫面高度很高,
強極渦事件就要留意,北極渦旋空投冷凍氣團。
事實上,
GFS已經預報一週過後北極渦旋開始對南方空投冷凍氣團,
但主要是對北美大量空投,因此1月初美國要留意冰風暴。
當然,這不是入冬首波了(之前已經有一股);
但強極渦事件對南方的後遺症很大,因為冷很久。
但是否強極渦事件往東亞發酵,
因時間還久,且目前模式首投北美,暫時不用管嚕。
(較忙快速說說,以上供參也)
--
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