天氣小觀:鋒面過後,春暖花開 - 颱風討論
By Agnes
at 2022-03-07T10:33
at 2022-03-07T10:33
Table of Contents
時序走到三月,
也是一般人體感認知春暖花開的三四五月春季;
事實上,從節氣來看,
進入了驚蟄,已經是非常"純正"的卯春了。
以太陽公轉黃道角度來看,
春分3月21日黃道0度
夏至6月21日黃道90度
秋分9月23日黃道180度
冬至12月22日黃道270度
如果以北極點晝夜來看,春季從3月21日開始;
如果以節氣立春來看,
立春黃道315度開始;也就是春分和冬至的中間位置;
一般落於2月3、4、5日起算春季。
用北極點起算春季太晚,因為大家沒有住在北極。
用節氣起算春季,對於體感而言太早;
因此,
取個中間值,就從3月起算春季。
春天開始,
最著名的產物就是大氣高空秀的鋒面雨了。
原因當然是西風南支槽穩定而活躍,
暖濕水氣不斷進入華南地區,
往往冷空氣南下,冷暖大戰的鋒面雲雨帶結構完整豐沛。
從華南到台灣的大氣高空500百帕中層來看,春天的大氣系統是標準的南北配置,
以北是西風帶系統,以南是連成一片的副熱帶高壓場,南北大氣對撞非常明顯。
;
這和其他季節不同,
夏秋的副高偏向在台灣東邊(東北/東南),冬季不知在哪邊(常常跑遠或崩潰)。
也由於春天獨特的南北大氣對撞,春季鋒面出現,
鋒面前緣或鋒區內,常常有低層噴流,更有利於地面氣流的輻合上升降雨。
今天較明顯的冷空氣南下,西風大槽從中亞轉直,
大氣中層菲律賓東方與中南半島高空的反氣旋單體連成一片副熱帶高壓場,
這道西風大槽強勢切斷副高場,但後繼無力,天氣很快就會回復穩定。
可說標準春季快速移動的系統。
春季大氣快速變動,秋季大氣變幻莫測,但每每就是會秀一波。
東亞春季高空秀,東亞高空的西風帶系統快速移動,
對於華南地區而言,
因為南支槽的活躍搭配北方快速移動的西風帶系統,華南雲雨帶消消長長,
伴隨"冷鋒/滯留鋒"的大氣形勢影響台灣秀一波。
東亞秋季地面秀,南北季風交會輻合的氣旋變幻莫測,
對於東亞南方,
因為熱帶氣旋的活躍搭配北方冷高壓建立的季風,南北季風與氣旋之間的互動,
於是"氣旋輻合/秋颱共伴"影響台灣秀一波。
至於未來一週,
今天的春季冷鋒通過變冷後,明早起回復穩定回暖,
之後模式預報未來一週沒有明顯的西風槽,只有快速移動的小槽,
南方副高場重新恢復一片,春暖花開了。
(簡單說說囉)
--
也是一般人體感認知春暖花開的三四五月春季;
事實上,從節氣來看,
進入了驚蟄,已經是非常"純正"的卯春了。
以太陽公轉黃道角度來看,
春分3月21日黃道0度
夏至6月21日黃道90度
秋分9月23日黃道180度
冬至12月22日黃道270度
如果以北極點晝夜來看,春季從3月21日開始;
如果以節氣立春來看,
立春黃道315度開始;也就是春分和冬至的中間位置;
一般落於2月3、4、5日起算春季。
用北極點起算春季太晚,因為大家沒有住在北極。
用節氣起算春季,對於體感而言太早;
因此,
取個中間值,就從3月起算春季。
春天開始,
最著名的產物就是大氣高空秀的鋒面雨了。
原因當然是西風南支槽穩定而活躍,
暖濕水氣不斷進入華南地區,
往往冷空氣南下,冷暖大戰的鋒面雲雨帶結構完整豐沛。
從華南到台灣的大氣高空500百帕中層來看,春天的大氣系統是標準的南北配置,
以北是西風帶系統,以南是連成一片的副熱帶高壓場,南北大氣對撞非常明顯。
;
這和其他季節不同,
夏秋的副高偏向在台灣東邊(東北/東南),冬季不知在哪邊(常常跑遠或崩潰)。
也由於春天獨特的南北大氣對撞,春季鋒面出現,
鋒面前緣或鋒區內,常常有低層噴流,更有利於地面氣流的輻合上升降雨。
今天較明顯的冷空氣南下,西風大槽從中亞轉直,
大氣中層菲律賓東方與中南半島高空的反氣旋單體連成一片副熱帶高壓場,
這道西風大槽強勢切斷副高場,但後繼無力,天氣很快就會回復穩定。
可說標準春季快速移動的系統。
春季大氣快速變動,秋季大氣變幻莫測,但每每就是會秀一波。
東亞春季高空秀,東亞高空的西風帶系統快速移動,
對於華南地區而言,
因為南支槽的活躍搭配北方快速移動的西風帶系統,華南雲雨帶消消長長,
伴隨"冷鋒/滯留鋒"的大氣形勢影響台灣秀一波。
東亞秋季地面秀,南北季風交會輻合的氣旋變幻莫測,
對於東亞南方,
因為熱帶氣旋的活躍搭配北方冷高壓建立的季風,南北季風與氣旋之間的互動,
於是"氣旋輻合/秋颱共伴"影響台灣秀一波。
至於未來一週,
今天的春季冷鋒通過變冷後,明早起回復穩定回暖,
之後模式預報未來一週沒有明顯的西風槽,只有快速移動的小槽,
南方副高場重新恢復一片,春暖花開了。
(簡單說說囉)
--
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