請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5136
標題: 利用渦流協變性系統量測都會區紊流熱通量之研究
Turbulent Heat Flux Measurements Using Eddy Covariance System in an Urban Area
作者: 余思穎
Yu, Ssu-Ying
關鍵字: eddy covariance system
渦流協變性系統
closure gaps
coordinate rotation
albedo
CO2 flux
能量缺口
座標旋轉
反照率
二氧化碳通量
出版社: 環境工程學系所
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摘要: 本研究目的為利用渦流協變性系統量測大氣地表層內都會區之紊流熱通量,以了解都會區之大氣地表層能量收支行為。本實驗在台中市中興大學的土木環工大樓 (24°12´N, 120°67´E) 進行觀測,觀測高度為50公尺,為時近四個月實驗(2006/2/11~2006/6/1) 之連續監測,量測蒸發潛熱通量與可感熱通量之紊流熱通量,並搭配地面之氣象低速反應系統,觀測都會區大氣能量平衡行為。 實驗期間未經校正之原始能量缺口為28.05 %。校正項可以縮小能量缺口,其中校正項包括二維及三維座標旋轉、WPL修正項、都會區平均反照率、平流項及長波輻射冷卻損失量之修正,再重新計算能量平衡,而測量推估出距實驗場址半徑1.4公里內之都會區平均反照率為0.202,則能量與經二維座標旋轉校正後,能量缺口縮小至4.08 %,為最佳校正之結果;而與三維校正後之能量缺口為5.68 %。兩者均有有很大幅度的改善,結果更接近真實能量平衡。 在二氧化碳通量方面,可以發現一天變化的高峰時段出現在上午八時及下午六時,一週高峰則出現在星期一及星期五,與人類活動有密切相關,並且主要受東側 (國光路) 風向所影響,交通源對二氧化碳通量影響占很大因素。
This study is to measure urban surface heat fluxes, especially emphasizing on turbulent heat flux in the atmospheric surface layer using eddy covariance system. The turbulent heat fluxes were measured at 50 m height above ground level on a tower standing on the roof of the Civil and Environmental Building (2412'' N, 12067''E) in National Chung-Hsing University, Taichung, Taiwan, for almost four months (2006/2/11~ 2006/6/1). It is found the surface energy budget was imbalanced, the turbulent heat flux was 28.05 % lower than the available surface heat flux during the study period. Corrections are made to reduce the energy gap, including coordinate system rotation, WPL correction, urban albedo correction, advected term correction, and long-wave radiational cooling term correction. After all the above corrections, the energy closure gap is reduced to 4.08 % using two-axis rotation correction, and to 5.68 % using three-axis rotation correction. That is, the result of the two-axis rotational correction is close to the true energy balance. The average urban albedo is determined to be 0.202 estimated within the radius of 1.4 km from the tower site. The peaks of the diurnal CO2 flux were observed at 8 AM and 6 PM, and the peaks of weekly CO2 flux were observed on Monday and Friday. In addition, flux from the east was higher than other wind direction. Therefore, it is suggested that the CO2 flux was mainly from the nearby traffic source, Kuo-Kuang Road.
URI: http://hdl.handle.net/11455/5136
其他識別: U0005-1107200615415900
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