[情報] 鄭明典FB
颱風暴風半徑的問題
"近中心最大風速"和"暴風半徑"是描述颱風最重要的兩個參數,當然要慎重處理。
不過,要先說,暴風圈並不是一個"實體",也就是說暴風半徑不是一個物理量,所以我們
稱它是個參數。
日本對7級風暴風半徑的詮釋是:可能出現高於7級平均風的圓形範圍的半徑。所以,很明
顯的,日本的定義是最大可能的7級風暴風半徑。
我們採用的概念是,沿著暴風半徑決定的圓圈來平均,預期的平均的平均風速是七級。有
點繞口,希望大家看得懂。
因為著眼點的不一樣,所以多年以來,我們發布的颱風暴風半徑永遠比日本氣象廳發布的
數值小,而且小很多,差距常常是2~3倍。
看懂定義,再去看看實測數據,看多一點所謂的"實測數據",不要只挑大的看,我們說的
250公里其實蠻合理的。
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只有我覺得這個說法問題太多嗎?
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