區域氣象環境與高臭氧之相關分析

Analysis of Local Circulation and High Ozone Generation

柳中明(Chung-Ming Liu) ； 蘇維中(Wei-Chung Su)

《大氣科學》 25卷1期 (1997/03) Pp. 27-50

摘要

This study analyzsed the data gathered from the 17 new EPA stations and the CWB stations in the northern Taiwan area (Taipei) during the summer time (Jun.~Aug.) in 1993 and 1994. Also we analyzed the data gathered from the 14 new EPA stations and the CWB stations in the southern Taiwan area (Kao-hsiung) during the summer and fall (Jun.∼Nov.) in 1993 and 1994. We found that the ozone episodes usually happened during the summer time in the Taipei area, and the fall time in the Kao-hsiung area. The statistical High Ozone Days (HOD) is 64% in the Taipei area and 60% in the Kao-hsiung area. On the HOD, from the analysis we found that high hourly solar radiation (＞55 min) and low cloud amount will lead to efficient photochemical reactions in Taipei and kao-hsiung area. Also the prevailing wind speed is weak (＜4.0m/s) and the land-sea breeze ciruclation is significant. Before 8 AM, land breeze is dominant; during 8AM∼10AM, land breeze changes to sea breeze; after 10 AM, sea breeze is dominant, and reaches to the daily maximum at about 2PM. As other hourly ozone concentration character, at noon, the ozone value is creasing 8 times than that in the early morning and reaches to the daily maximum. In Taipei area, ozone episodes happened often in Shi-chih, Sung-shan and Tuu-chen, the respective statistic frequency is 33%, 32%, and 33%. While in Kao-hsiung area, the respective statistic frequency in Chiao-tou, Tso-ying, Ping-tong is 42%, 50% and 51%. The maximum ozone value can reach to be 215 ppb in Tuu-chen, and 206 ppb in Ping-tong, the position of these two stations is around the sea-breeze's down-wind zone.

關鍵字

高臭氧污染 ； 區域環流 ； 台北地區 ； 高雄地區

並列摘要

This study analyzsed the data gathered from the 17 new EPA stations and the CWB stations in the northern Taiwan area (Taipei) during the summer time (Jun.~Aug.) in 1993 and 1994. Also we analyzed the data gathered from the 14 new EPA stations and the CWB stations in the southern Taiwan area (Kao-hsiung) during the summer and fall (Jun.∼Nov.) in 1993 and 1994. We found that the ozone episodes usually happened during the summer time in the Taipei area, and the fall time in the Kao-hsiung area. The statistical High Ozone Days (HOD) is 64% in the Taipei area and 60% in the Kao-hsiung area. On the HOD, from the analysis we found that high hourly solar radiation (＞55 min) and low cloud amount will lead to efficient photochemical reactions in Taipei and kao-hsiung area. Also the prevailing wind speed is weak (＜4.0m/s) and the land-sea breeze ciruclation is significant. Before 8 AM, land breeze is dominant; during 8AM∼10AM, land breeze changes to sea breeze; after 10 AM, sea breeze is dominant, and reaches to the daily maximum at about 2PM. As other hourly ozone concentration character, at noon, the ozone value is creasing 8 times than that in the early morning and reaches to the daily maximum. In Taipei area, ozone episodes happened often in Shi-chih, Sung-shan and Tuu-chen, the respective statistic frequency is 33%, 32%, and 33%. While in Kao-hsiung area, the respective statistic frequency in Chiao-tou, Tso-ying, Ping-tong is 42%, 50% and 51%. The maximum ozone value can reach to be 215 ppb in Tuu-chen, and 206 ppb in Ping-tong, the position of these two stations is around the sea-breeze's down-wind zone.

並列關鍵字

ozone episode ； land-see breeze