天氣小觀：大陸高壓是否影響天秤颱風 - 颱風討論
By Carolina Franco
at 2012-08-21T08:52
at 2012-08-21T08:52
Table of Contents
天氣小觀：大陸高壓是否影響天秤颱風
目前西風槽從華北東移，緯度頗高，
太平洋高壓東退，天秤颱風短暫偏北，不過不會被西風槽勾到
之後太平洋高壓西伸，預料天秤轉偏西
西風槽後面是大陸冷高壓，
冬季的冷高壓高度通常僅於對流層低層
但是夏末秋初的冷高壓高度可發展到對流層中層
這是因為夏季大陸上空為高氣壓，
尤其對流層高層為一強大的南亞高壓，
秋初時，地面冷高壓從西伯利亞南下後，
儘管地面出現高壓，
然而大陸高空仍為高氣壓，往往和地面的冷高壓重合，
使大陸冷高壓發展到對流層中層，
或對流層中層的太平洋高壓西伸後往下和大陸冷高壓重合。
目前在地面層冷暖空氣已在在大陸上對峙並形成秋雨鋒面，
預報冷高壓會與700hpa對流層中層重合，發展至對流層中層，
冷高壓高度場增高，影響颱風路徑的能力越強。
兩天後冷高壓減弱東移，
這也是有些預報天秤颱風，會受大陸冷高壓影響往南偏的趨勢。
--
目前西風槽從華北東移，緯度頗高，
太平洋高壓東退，天秤颱風短暫偏北，不過不會被西風槽勾到
之後太平洋高壓西伸，預料天秤轉偏西
西風槽後面是大陸冷高壓，
冬季的冷高壓高度通常僅於對流層低層
但是夏末秋初的冷高壓高度可發展到對流層中層
這是因為夏季大陸上空為高氣壓，
尤其對流層高層為一強大的南亞高壓，
秋初時，地面冷高壓從西伯利亞南下後，
儘管地面出現高壓，
然而大陸高空仍為高氣壓，往往和地面的冷高壓重合，
使大陸冷高壓發展到對流層中層，
或對流層中層的太平洋高壓西伸後往下和大陸冷高壓重合。
目前在地面層冷暖空氣已在在大陸上對峙並形成秋雨鋒面，
預報冷高壓會與700hpa對流層中層重合，發展至對流層中層，
冷高壓高度場增高，影響颱風路徑的能力越強。
兩天後冷高壓減弱東移，
這也是有些預報天秤颱風，會受大陸冷高壓影響往南偏的趨勢。
--
Tags:
颱風
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