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題名 | 臺灣地區春夏季乾濕年受長週期擾動影響之研究 |
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作者 | 許子乾; 王作臺; | 書刊名 | 大氣科學 |
卷期 | 18:2 1990.06[民79.06] |
頁次 | 頁85-110 |
分類號 | 328.635 |
關鍵詞 | 長週期; 春季; 夏季; 乾濕年; 臺灣; 擾動; |
語文 | 中文(Chinese) |
中文摘要 | 本研究利用500毫巴高度場距平值的大小,選取1980年為正距平年,1984年為負距平年,1978年為準正常年。針對三個年份進行1月-7月的時間序列和頻路域的分析。藉以探討大尺度長時間週期擾動對梅雨期降水多寡的影響。 結果顯示,由500毫巴面高度場的頻率域分析,可知臺灣地區在異常距平年時,18-53天週期的低頻擾動有很大的貢獻,但正距平年和負距平年在此週期内其分段結構有明顯的不同。然而在正常年中此長週期的擾動則佔有較少的貢獻。分析高度場擾動的時空分布,以緯度13°°-25N為範圍取平均,做時間-經度的分佈。顯示1980年在2月時有一明顯大範圍的正擾動出現。 根據結果分析,選取太平洋高壓中心區域2月高度距平場,作為參考指標,以探討長時間週期的擾動和梅雨期5月降水量多寡之關係。由參考指標和5月少雨的相關係數為-0.57;而由參考指標中選取出的7個個案中,有5個符合少雨的條件。此顯示太平洋高壓中心區域2月高度正距平擾動和5月臺灣梅雨少雨有某種程度的相關。 |
英文摘要 | This study uses the 30 years 500 mb height field data to identify the anomaly within those years. 3 different years are chosen to represent the structures of the quasi-normal, characteristic positive and negative anomalies. Fourier analysis is performed upon the time series constructed from those 3 years. The contribution of low frequency band to the total variance of different years are calculated. The effect of this low frequency contribution on the anomalous rainfall in Mei-Yu season is investigated. It is found that, the year with anomalous height field during the Mei-Yu season in Taiwan area, the variance contributed from 18-53 days period is quite significant. While in the quasi-normal year, the contribution from 18-53 days period is relatively small. Time-Longitude section based on the averaged data between 15N-25N band suggests that during the positive anomaly year, a large positive disturbance occurred in the Spring of that year at the Pacific sector. The connection between the rainfall anomaly in May and the circulation anomaly of the Pacific high in the Spring time are also studied. The result shows that the correlation between those 2 indices is -0.57. For all 7 cases with large pacific high anomaly in the Spring, 5 cases can be identified with as dry season in May around Taiwan area. This result suggests that the Spring time height anomaly in the Pacific high region has reasonable good connection with Mei-Yu rainfall amount in Taiwan area. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。