天氣小觀:未來一周,亞洲大氣全面反轉 - 颱風討論

By Isla
at 2017-10-21T07:55
at 2017-10-21T07:55
Table of Contents
時序慢慢接近11月,青藏高原逐漸由熱源轉為冷源,
對亞洲而言也是前冬時期將屆,
為了迎接冬季寒潮爆發的來臨,
模式預報,未來一周亞洲大氣全面反轉,南亞高壓已消失,
青藏高原降溫,已經有部分冷空氣向印度半島輸出,
孟加拉灣也反轉出現偏北風,
冷空氣來自來自印度半島東北與青藏高原轉冷源,
印度半島的的東北風也往阿拉伯海輸出,
阿拉伯海產生反氣旋,向索馬利亞吹出東北風,
原先的西南季風/西南風消失殆盡,轉由東北風往赤道吹,
北印度洋的大氣和洋流由夏季的順時針轉為冬季的逆時針形勢。
值得一提的是,阿拉伯海的反氣旋與東非副高有關,
在北非-阿拉伯半島大陸的副熱帶高壓(平均稱東非副高),
與東亞不同的是這裡冬季沒有東亞大槽,
因此全年副熱帶高壓壟罩的沙漠。
而印度半島-東亞,則是季風亞洲氣候,
冬季有強大的西伯利亞地面冷高壓控場,
東北季風吹進中南半島、印度半島,
高空有東亞大槽控場,逼退太平洋副高。
東亞大槽為平均槽,
也就是西風氣流在這裡會形成V型,讓西風帶壓得更南邊。
相較之下,
北非-阿拉伯半島沒有東亞大槽,因此副高則終年穩定,
且由於北側西風氣流加強,往往加強副高的強度。
除非北方地中海有明顯強大西風槽發展影響。
在春季開始後,副高會往東影響阿拉伯海,
一直到夏季六月西南季風爆發,副高才退回北非-阿拉伯半島內陸。
秋季10月以後,阿拉伯海的西南季風迅速消退,
副高又重新向東伸影響阿拉伯海,不過,只是過渡期,
很快的11月以後,前冬時期來臨,西伯利亞冷高壓強勢控場亞洲,
冷空氣南下,副高不喜好寒冷,退回北非-阿拉伯半島低緯度。
綜上,
北非-阿拉伯副高依舊穩定控場,除非短暫的地中海西風大槽影響,
南亞印度半島則視東北季風何時來降溫,
東亞則是東北季風爆發點,蒙古/西伯利亞冷高壓在此區引爆,
東北季風東亞沿海或東北亞日韓而下,經過台灣衝向南海、東南亞。
未來一周的台灣大氣模式就持續受東北季風影響,
隨著蘭恩颱風北上,台灣東北季風更強,明後天溫度更低,
北部將出現20度以下冷空氣影響,
東北季風海汽耦合後的濕冷水汽帶進北部降雨,變成濕冷的北部。
而且還會持續影響基隆北海岸到宜蘭地區,
主要原因在於東北季風強度不減,蘭恩颱風北上後,
菲律賓東方持續有氣旋擾動,是否發展要再觀察,
因為東北季風已經強到擁有對颱風產生殺傷力。
但是依舊能與颱風產生共伴效應,
標準共伴效應就是太平洋高壓、西風槽、颱風。
但卻無大陸冷高壓,
因為共伴效應不需要大陸冷高壓,
東北季風或帶有冷空氣的東北風都可以和颱風共伴效應,
但大陸冷高壓和颱風則是格格不入,
一個是地面高壓系統發展起來,一個是地面低壓系統發展起來
一個喜好乾冷,一個喜好濕熱,當然格格不入,
因此,冬季冷高壓控場後,
即便冬颱形成,除非冬颱直襲,台灣已經不在共伴效應範圍內。
未來一周亞洲全面大氣反轉,
台灣天氣東北季風持續吹,天氣溫度還是秋涼為主。
但由於台灣目前還是共伴效應範圍內,
仍要關注南方熱帶氣旋是否出現。
(簡單說說,以上供參囉)
--
對亞洲而言也是前冬時期將屆,
為了迎接冬季寒潮爆發的來臨,
模式預報,未來一周亞洲大氣全面反轉,南亞高壓已消失,
青藏高原降溫,已經有部分冷空氣向印度半島輸出,
孟加拉灣也反轉出現偏北風,
冷空氣來自來自印度半島東北與青藏高原轉冷源,
印度半島的的東北風也往阿拉伯海輸出,
阿拉伯海產生反氣旋,向索馬利亞吹出東北風,
原先的西南季風/西南風消失殆盡,轉由東北風往赤道吹,
北印度洋的大氣和洋流由夏季的順時針轉為冬季的逆時針形勢。
值得一提的是,阿拉伯海的反氣旋與東非副高有關,
在北非-阿拉伯半島大陸的副熱帶高壓(平均稱東非副高),
與東亞不同的是這裡冬季沒有東亞大槽,
因此全年副熱帶高壓壟罩的沙漠。
而印度半島-東亞,則是季風亞洲氣候,
冬季有強大的西伯利亞地面冷高壓控場,
東北季風吹進中南半島、印度半島,
高空有東亞大槽控場,逼退太平洋副高。
東亞大槽為平均槽,
也就是西風氣流在這裡會形成V型,讓西風帶壓得更南邊。
相較之下,
北非-阿拉伯半島沒有東亞大槽,因此副高則終年穩定,
且由於北側西風氣流加強,往往加強副高的強度。
除非北方地中海有明顯強大西風槽發展影響。
在春季開始後,副高會往東影響阿拉伯海,
一直到夏季六月西南季風爆發,副高才退回北非-阿拉伯半島內陸。
秋季10月以後,阿拉伯海的西南季風迅速消退,
副高又重新向東伸影響阿拉伯海,不過,只是過渡期,
很快的11月以後,前冬時期來臨,西伯利亞冷高壓強勢控場亞洲,
冷空氣南下,副高不喜好寒冷,退回北非-阿拉伯半島低緯度。
綜上,
北非-阿拉伯副高依舊穩定控場,除非短暫的地中海西風大槽影響,
南亞印度半島則視東北季風何時來降溫,
東亞則是東北季風爆發點,蒙古/西伯利亞冷高壓在此區引爆,
東北季風東亞沿海或東北亞日韓而下,經過台灣衝向南海、東南亞。
未來一周的台灣大氣模式就持續受東北季風影響,
隨著蘭恩颱風北上,台灣東北季風更強,明後天溫度更低,
北部將出現20度以下冷空氣影響,
東北季風海汽耦合後的濕冷水汽帶進北部降雨,變成濕冷的北部。
而且還會持續影響基隆北海岸到宜蘭地區,
主要原因在於東北季風強度不減,蘭恩颱風北上後,
菲律賓東方持續有氣旋擾動,是否發展要再觀察,
因為東北季風已經強到擁有對颱風產生殺傷力。
但是依舊能與颱風產生共伴效應,
標準共伴效應就是太平洋高壓、西風槽、颱風。
但卻無大陸冷高壓,
因為共伴效應不需要大陸冷高壓,
東北季風或帶有冷空氣的東北風都可以和颱風共伴效應,
但大陸冷高壓和颱風則是格格不入,
一個是地面高壓系統發展起來,一個是地面低壓系統發展起來
一個喜好乾冷,一個喜好濕熱,當然格格不入,
因此,冬季冷高壓控場後,
即便冬颱形成,除非冬颱直襲,台灣已經不在共伴效應範圍內。
未來一周亞洲全面大氣反轉,
台灣天氣東北季風持續吹,天氣溫度還是秋涼為主。
但由於台灣目前還是共伴效應範圍內,
仍要關注南方熱帶氣旋是否出現。
(簡單說說,以上供參囉)
--
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