天氣小觀:未來一周,斜壓大氣系統展現威力 - 颱風討論

By David
at 2017-10-06T13:27
at 2017-10-06T13:27
Table of Contents
天氣小觀:未來一周,斜壓大氣系統展現威力,模式預報太平洋高壓將斷裂
地球上的大氣環境,
夏季大氣 與 冬季大氣 是讓人感受深刻,中間變換反映出的就是
夏 > 秋
^ V
春 < 冬
春夏秋冬。
因此有的人喜好夏天,有的人喜好冬天;當然可再細分到過渡時期的春秋。
不過,換個角度來看氣象,
正壓大氣 與 斜壓大氣 是大氣動力的兩大分類,
在正壓大氣環境下的天氣系統為正壓系統,
在斜壓大氣環境下的天氣系統為斜壓系統,
而事實上,
正壓大氣只是理想大氣環境,實際地球大氣為斜壓大氣。
儘管如此,在 特定地區 或是 特定情況下,
斜壓大氣不明顯,
因此可以把此一大氣環境視為正壓大氣,
其中的天氣系統視為"正壓系統"或"相當正壓"系統
例如:
熱帶大氣環境視為正壓大氣,
颱風視為"相當正壓"系統,太平洋高壓視為"正壓"系統。
由於正壓大氣是理想大氣,
實際大氣情況來區分正斜時,
若主要以正壓大氣動力的展現,就視為正壓大氣。
若主要以斜壓大氣動力的展現,就視為斜壓大氣。
正壓與斜壓大氣之間也可可以互相轉換,
中間變換與春夏秋冬雖然不同,但卻一樣精采。
正壓不穩定 > 斜壓大氣
^ V
正壓大氣 < 斜壓不穩定
上面這些,用一些舉例如下,
[ 夏季系統 V.S 冬季系統 ]
1. 秋 -> 冬:寒流
2. 冬 -> 春:春雨 (春天是由高空西南風攻勢,主要感受是春雨綿綿)
3. 春 -> 夏:熱浪
4. 夏 -> 秋:秋風 (秋天是由地面東北風攻勢,主要感受是秋風送爽)
[ 正壓大氣 V.S 斜壓大氣 ]
1. 斜壓大氣 -> 斜壓不穩定 :寒潮爆發
2. 斜壓不穩定 -> 正壓大氣 :西風大槽往熱帶高空割離出來冷心低壓
3. 正壓大氣 -> 正壓不穩定 :颱風
4. 正壓不穩定 -> 斜壓大氣 :颱風併入西風槽轉化溫帶氣旋
台灣因為緯度較低來看,
正壓大氣環境主要在太平洋高壓籠罩的夏季,
斜壓大氣環境主要在西風帶南移過境的冬季。
因此,對氣象迷來說,
不管是喜好正壓大氣,還是喜好斜壓大氣,或是亦正亦斜/正斜互轉...
其實都是浩瀚的學問。
***這裡做個開場就好,
理想的正壓大氣,只和氣壓有關,與溫度無關,
在一定壓力下的大氣面,溫度相等,
等壓面上沒有等溫線,則為正壓大氣。
在正壓大氣中,等壓面、等溫面與等密度面為同一平面。
另外正壓大氣中,透過正壓不穩定機制,誕生出颱風,
颱風為一暖心結構,具有溫度梯度,但沒有中緯度氣旋之斜壓機制,
因此,
雖然颱風等壓面上有等溫線,
但因為等溫面與等高面平行,系統結構垂直不傾斜,
這種不透過斜壓機制,等壓面上的溫度場和高度場相位差0度或180度的系統,
稱為"相當正壓"系統,颱風,南北極渦旋都是相當正壓系統。
對應正壓,接下來就是斜壓了,
斜壓大氣就是等壓面上有溫度梯度,
即:等壓面與等溫面/等密度面出現交角而非平行的大氣環境。
當然,代表性就是中緯度西風帶,
西風槽一般隨高度向西傾斜,溫度槽一般隨高度向東傾斜,
形成西風槽與溫度槽不重疊的斜壓大氣環境。
目前的大氣情況逐漸入秋,
中緯度西風帶斜壓系統壓迫太平洋高壓正壓系統的力道越來越強大,
因此未來的東亞大氣是斜壓的時代,
如果說,
正壓的相關學問滿天滿地,也許要花一整個春夏來淺談,
那麼說,
斜壓的相關學問無垠無際,也許要花一整個秋冬來淺談。
因此說,
開場以正壓鋪陳出斜壓,今秋冬有空再慢慢淺談無垠無際斜壓大氣。
模式預報,
一周後期斜壓系統在東亞展現威力,西風大槽斬斷太平洋高壓脊。
太平洋高壓的5880位勢米的厚牆被切斷,台灣北部感受到20~25度的冷氣,
台灣是否準備跟太平洋高壓說掰掰了嗎?
更長期的預報認為,
未來一周尾,西風槽切斷高壓牆後,付出的代價也不小,
因此,更遠的一周過後,太平洋高壓會回來補牆。
當然,這還有待觀察。
但不管如何,未來一周,西風大槽狠狠切斷強韌的高壓厚牆,展現出了斜壓的威力。
對台灣來說,
目前太平洋高壓大氣中層500百帕主中心在琉球海域,約5935位勢米
高壓勢力穩穩壟罩台灣,不過地面層依然有分裂高壓帶來東北風,
加上位於菲律賓東方有大型氣旋擾動,雖然擾動很弱,
但通過菲律賓進入南海的過程,加強東北風,並且把水氣推向台灣,
因此今天開始大約三天,東北部和東部天氣不穩定,
尤其東北部要留意雨勢。
之後模式就精彩了,
預報顯示新的菲律賓東方熱帶擾動會通過呂宋島進入南海發展,
剛好又碰上(類)東北季風南下,
是否上演秋季地面大氣精彩的重頭戲可以再觀察。
從北方系統來看,影響台灣主要也落在一周後段,
一周中前段,1048百帕以上的地面冷高壓南下,
但被太平洋高壓擋下,
不過由於冷氣庫充足,立刻接著第二波1040百帕冷高壓南下,
因此,太平洋高壓斷裂,(類)東北季風衝向台灣,
台灣北部明顯溫降,可達冷氣機調整強冷的溫度了(當然還是屬於"涼空氣"),
之後就是南北系統互動的大戲了。
(以上供參囉)
--
地球上的大氣環境,
夏季大氣 與 冬季大氣 是讓人感受深刻,中間變換反映出的就是
夏 > 秋
^ V
春 < 冬
春夏秋冬。
因此有的人喜好夏天,有的人喜好冬天;當然可再細分到過渡時期的春秋。
不過,換個角度來看氣象,
正壓大氣 與 斜壓大氣 是大氣動力的兩大分類,
在正壓大氣環境下的天氣系統為正壓系統,
在斜壓大氣環境下的天氣系統為斜壓系統,
而事實上,
正壓大氣只是理想大氣環境,實際地球大氣為斜壓大氣。
儘管如此,在 特定地區 或是 特定情況下,
斜壓大氣不明顯,
因此可以把此一大氣環境視為正壓大氣,
其中的天氣系統視為"正壓系統"或"相當正壓"系統
例如:
熱帶大氣環境視為正壓大氣,
颱風視為"相當正壓"系統,太平洋高壓視為"正壓"系統。
由於正壓大氣是理想大氣,
實際大氣情況來區分正斜時,
若主要以正壓大氣動力的展現,就視為正壓大氣。
若主要以斜壓大氣動力的展現,就視為斜壓大氣。
正壓與斜壓大氣之間也可可以互相轉換,
中間變換與春夏秋冬雖然不同,但卻一樣精采。
正壓不穩定 > 斜壓大氣
^ V
正壓大氣 < 斜壓不穩定
上面這些,用一些舉例如下,
[ 夏季系統 V.S 冬季系統 ]
1. 秋 -> 冬:寒流
2. 冬 -> 春:春雨 (春天是由高空西南風攻勢,主要感受是春雨綿綿)
3. 春 -> 夏:熱浪
4. 夏 -> 秋:秋風 (秋天是由地面東北風攻勢,主要感受是秋風送爽)
[ 正壓大氣 V.S 斜壓大氣 ]
1. 斜壓大氣 -> 斜壓不穩定 :寒潮爆發
2. 斜壓不穩定 -> 正壓大氣 :西風大槽往熱帶高空割離出來冷心低壓
3. 正壓大氣 -> 正壓不穩定 :颱風
4. 正壓不穩定 -> 斜壓大氣 :颱風併入西風槽轉化溫帶氣旋
台灣因為緯度較低來看,
正壓大氣環境主要在太平洋高壓籠罩的夏季,
斜壓大氣環境主要在西風帶南移過境的冬季。
因此,對氣象迷來說,
不管是喜好正壓大氣,還是喜好斜壓大氣,或是亦正亦斜/正斜互轉...
其實都是浩瀚的學問。
***這裡做個開場就好,
理想的正壓大氣,只和氣壓有關,與溫度無關,
在一定壓力下的大氣面,溫度相等,
等壓面上沒有等溫線,則為正壓大氣。
在正壓大氣中,等壓面、等溫面與等密度面為同一平面。
另外正壓大氣中,透過正壓不穩定機制,誕生出颱風,
颱風為一暖心結構,具有溫度梯度,但沒有中緯度氣旋之斜壓機制,
因此,
雖然颱風等壓面上有等溫線,
但因為等溫面與等高面平行,系統結構垂直不傾斜,
這種不透過斜壓機制,等壓面上的溫度場和高度場相位差0度或180度的系統,
稱為"相當正壓"系統,颱風,南北極渦旋都是相當正壓系統。
對應正壓,接下來就是斜壓了,
斜壓大氣就是等壓面上有溫度梯度,
即:等壓面與等溫面/等密度面出現交角而非平行的大氣環境。
當然,代表性就是中緯度西風帶,
西風槽一般隨高度向西傾斜,溫度槽一般隨高度向東傾斜,
形成西風槽與溫度槽不重疊的斜壓大氣環境。
目前的大氣情況逐漸入秋,
中緯度西風帶斜壓系統壓迫太平洋高壓正壓系統的力道越來越強大,
因此未來的東亞大氣是斜壓的時代,
如果說,
正壓的相關學問滿天滿地,也許要花一整個春夏來淺談,
那麼說,
斜壓的相關學問無垠無際,也許要花一整個秋冬來淺談。
因此說,
開場以正壓鋪陳出斜壓,今秋冬有空再慢慢淺談無垠無際斜壓大氣。
模式預報,
一周後期斜壓系統在東亞展現威力,西風大槽斬斷太平洋高壓脊。
太平洋高壓的5880位勢米的厚牆被切斷,台灣北部感受到20~25度的冷氣,
台灣是否準備跟太平洋高壓說掰掰了嗎?
更長期的預報認為,
未來一周尾,西風槽切斷高壓牆後,付出的代價也不小,
因此,更遠的一周過後,太平洋高壓會回來補牆。
當然,這還有待觀察。
但不管如何,未來一周,西風大槽狠狠切斷強韌的高壓厚牆,展現出了斜壓的威力。
對台灣來說,
目前太平洋高壓大氣中層500百帕主中心在琉球海域,約5935位勢米
高壓勢力穩穩壟罩台灣,不過地面層依然有分裂高壓帶來東北風,
加上位於菲律賓東方有大型氣旋擾動,雖然擾動很弱,
但通過菲律賓進入南海的過程,加強東北風,並且把水氣推向台灣,
因此今天開始大約三天,東北部和東部天氣不穩定,
尤其東北部要留意雨勢。
之後模式就精彩了,
預報顯示新的菲律賓東方熱帶擾動會通過呂宋島進入南海發展,
剛好又碰上(類)東北季風南下,
是否上演秋季地面大氣精彩的重頭戲可以再觀察。
從北方系統來看,影響台灣主要也落在一周後段,
一周中前段,1048百帕以上的地面冷高壓南下,
但被太平洋高壓擋下,
不過由於冷氣庫充足,立刻接著第二波1040百帕冷高壓南下,
因此,太平洋高壓斷裂,(類)東北季風衝向台灣,
台灣北部明顯溫降,可達冷氣機調整強冷的溫度了(當然還是屬於"涼空氣"),
之後就是南北系統互動的大戲了。
(以上供參囉)
--
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