查詢結果分析
來源資料
頁籤選單縮合
題 名 | 臺灣北部機場五至九月雲對地閃電氣候特徵分析=Climatological Characteristics of Cloud-to-Ground Lightning around the Airports in Northern Taiwan Based on Data from May through September |
---|---|
作 者 | 呂貴寶; 潘大綱; 鄭敏璋; 吳啟雄; | 書刊名 | 氣象預報與分析 |
卷 期 | 179 2004.06[民93.06] |
頁 次 | 頁27-32 |
分類號 | 447.554 |
關鍵詞 | 雲對地閃電; 閃電頻率; 地形效應; Cloud-to-ground lightning; Lightning frequency; Terrain effect; |
語 文 | 中文(Chinese) |
中文摘要 | 閃電資料具有非常好的時間及空間解析度,而閃電頻率之時空分布,與對流系統強弱變化及空間化布間亦具有相當密切之相關性。本文利用1991~1998年5~9月雲對地閃電資料,分析臺灣北部機場雲對地閃電之特徵,其中包含全時、逐月及日夜變化等空間分布,並針對松山及中正機場附近統計雲對地閃電頻率,藉以瞭解雲對地閃電在臺灣北部地區之時空分布變化。 由閃電頻率變化及分布顯示:全時之高頻率區位於臺北盆地,其範圍涵蓋松山機場及其東至西南方位,但僅位於中正機場外之東至南方位20公里外。以月份區分,6月松山機場附近具有最高值,7、8月次之,9月明顯減少;中正機場附近最高值出現在7月,變化趨勢均較松山機場附近為緩和。在日夜變化及分布方面,除二機場數值差異外,高頻率時段均集中在午後,最高值出現在14~16之間。顯示此區雲對地閃電氣候特徵,分別受地形效應、季節對流活躍度及陸上加熱作用所影響。 |
英文摘要 | Lightning data is inherent in highly spatial and temporal resolution. And also the lightning distributions are well related with the intensity of convective system and its location. So, the lightning data from May through September during the 1991-1998 periods are examined for finding the features of Cloud-to-Ground lightning around the airports in northern Taiwan. The spatial distributions of cumulative frequency of hourly flash count, monthly lightning days, and diurnal variation of lightning are documented in this study. For exhibiting the space and time distribution chances, we focus on the flashes on Sung Shan and Tao Yuan-airport and their surrounding. From the lightning frequency variation and distribution, we know that 1)at Taipei Basin, the highest cumulative frequency of hourly flash count cover Sung Shan-airport and its east-southwest sector; for Tao Yuan-airport, they are located at the east-south sector 20 kilometer away from airport, 2)near Sung Shan-airport area, the maximum lightning month is June. Other prominent maxima are July and August. September is more less; near Tao Yuan-airport area, the highest lightning activities occur in June. However, the difference between months is not as much as Sung Shan-airport, and 3)diurnal distributions of lightning present that except frequency count difference, the majority of lightning was produced in the afternoon, especially at 14~16LST. Based on what have mentioned above, we postulate that the climatological characteristics of cloud-to-ground lightning around airports in the northern Taiwan is resulted from terrain effect, convective activity in Mei-Yu and summer season, and heating over land. |
本系統中英文摘要資訊取自各篇刊載內容。