天氣小觀:一周後,春暖花開 - 颱風討論
By Eartha
at 2014-02-19T19:49
at 2014-02-19T19:49
Table of Contents
天氣小觀:一周後,春暖花開
太陽直射點漸漸北移,對於北極區的大氣高層反應最直接,
從永夜轉向迎接陽光的開始,在平流層的臭氧溫度很快反應逐漸升溫,
大氣溫度增加壓力變大,直接衝擊的就是北極渦旋逐漸減弱,
事實上到了北極夏季,平流層會轉為高壓,北極渦旋僅能存在對流層或甚至消失。
在北極高空平流層,平均來說,四月上旬前,主要仍受北極渦旋控制,
四月下旬北極高壓勢力開始壓過北極渦旋,
5月北極高壓正式建立,此時南亞高壓也建立了,
到了7月達到最強,且從上而下與北半球對流層上層的南亞高壓連在一起,
於是在北半球夏季,
"平流層最強的高壓系統-北極高壓"和"對流層最強的高壓系統-南亞高壓",
兩大高壓連線,一起控制著北半球夏季高空。
8月以後,北極高壓開始減弱,到了8月底夏季結束,北極渦旋再起,北極高壓結束。
回到目前的大氣,位於白令海峽一帶的阻塞高壓一周後將往北美西岸崩潰,
崩潰過程中,將整個北極冷空氣帶往加拿大,
加拿大一周後迅速急凍,美國中部和東岸也降受到寒流侵襲。
這一波對衝擊對北極渦旋影響不小,可以說差點分裂,一來是美西北伸的暖脊
另一個從歐洲北伸的暖脊,只是歐洲脊不夠強,兩脊無法連線,
但由於歐洲脊移向中亞,對於脊前的中亞,對應出很明顯的西風槽,
西風槽後的強冷高壓勢力竟達1056百帕以上,因此未來一周中亞將受強冷氣團影響。
相對於未來一周,北美、中亞的劇烈天氣變化,東亞則是先冷後熱,
這一波冷氣團接力上一波的餘威震盪,也帶來寒冷天氣,
之後則漸漸恢復春暖花開的氣息,
主要是中亞的西風槽東移後減縮,因此東亞的西風帶波動小,
副熱帶西風噴流減弱也表示北方沒有強冷空氣南下了,
不僅台灣,整個東亞除東北亞外,一周後全面回暖。
(以上供參囉)
--
太陽直射點漸漸北移,對於北極區的大氣高層反應最直接,
從永夜轉向迎接陽光的開始,在平流層的臭氧溫度很快反應逐漸升溫,
大氣溫度增加壓力變大,直接衝擊的就是北極渦旋逐漸減弱,
事實上到了北極夏季,平流層會轉為高壓,北極渦旋僅能存在對流層或甚至消失。
在北極高空平流層,平均來說,四月上旬前,主要仍受北極渦旋控制,
四月下旬北極高壓勢力開始壓過北極渦旋,
5月北極高壓正式建立,此時南亞高壓也建立了,
到了7月達到最強,且從上而下與北半球對流層上層的南亞高壓連在一起,
於是在北半球夏季,
"平流層最強的高壓系統-北極高壓"和"對流層最強的高壓系統-南亞高壓",
兩大高壓連線,一起控制著北半球夏季高空。
8月以後,北極高壓開始減弱,到了8月底夏季結束,北極渦旋再起,北極高壓結束。
回到目前的大氣,位於白令海峽一帶的阻塞高壓一周後將往北美西岸崩潰,
崩潰過程中,將整個北極冷空氣帶往加拿大,
加拿大一周後迅速急凍,美國中部和東岸也降受到寒流侵襲。
這一波對衝擊對北極渦旋影響不小,可以說差點分裂,一來是美西北伸的暖脊
另一個從歐洲北伸的暖脊,只是歐洲脊不夠強,兩脊無法連線,
但由於歐洲脊移向中亞,對於脊前的中亞,對應出很明顯的西風槽,
西風槽後的強冷高壓勢力竟達1056百帕以上,因此未來一周中亞將受強冷氣團影響。
相對於未來一周,北美、中亞的劇烈天氣變化,東亞則是先冷後熱,
這一波冷氣團接力上一波的餘威震盪,也帶來寒冷天氣,
之後則漸漸恢復春暖花開的氣息,
主要是中亞的西風槽東移後減縮,因此東亞的西風帶波動小,
副熱帶西風噴流減弱也表示北方沒有強冷空氣南下了,
不僅台灣,整個東亞除東北亞外,一周後全面回暖。
(以上供參囉)
--
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