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標題: 渦流協變性系統與梯度法觀測水體二氧化碳通量之研究
Comparison of observed air-water CO2 fluxes by the eddy covariance system and the profile method
作者: 王奕智
Wang, Yi-Chih
關鍵字: 通量;flux;Underway-pCO2;渦流協變性系統;梯度法;Underway-pCO2;Eddy Covariance System;Profile method
出版社: 環境工程學系所
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距離水面40 公分與16公尺渦流協變性系統二氧化碳通量,水體多為吸收的現象且有日夜周期變化,白天時,水體中的藻類行光合作用吸收二氧化碳,使得渦流協變法所計算出來通量有吸收現象,晚上時,水體中藻類行呼吸作用計算結果為釋放現象。16公尺渦流協變性系統為涵蓋了大範圍的訊號,附近地貌大多為水池,量測到為區域性代表訊號,所以會與40公分渦流協變性系統訊號相似。40公分渦流協變性系統所量測水體之吸收的訊號,通常不是在中午太陽輻射最強的時候,水體吸收具有延遲時間,而吸收最強常在下午、傍晚甚至入夜後。

CO2 flux has been estimated by close path CO2 analyzer for decades. Recently, Open path CO2 analyzer has been used in CO2 flux measurements over ocean. However, there still exited significant difference between each other.
The purposes of this study are to compare the CO2 flux measured from (1) two open path eddy covariance systems (ECS) at 40 centimeter and 16 meter above the water surface; (2) the profile method sampling at 10, 15 and 20 centimeter above the water surface; (3) the underway-pCO2 system and (4) the dissolved oxygen method. The study site is located at Black-faced Spoonbill Conservation Association in Cigu Dist. The results showed that the CO2 fluxes of all methods is of diurnal cycle variation in which the CO2 fluxes were usually negative during daytime and positive at night. However, the CO2 fluxes of underway-pCO2 system were positive (source) during study period. The magnitude of CO2 fluxes of profile method are usually greater than those of ECS and dissolved oxygen method with 10 to 100 times. The underway-pCO2 system is less than the ECS and dissolved oxygen method with 10 times.
During the day, the algae in water absorbs CO2 for photosynthesis and releases CO2 at night which is constituent with the results of the ECS.. Although the ECS at 16 m has larger footprint than that at 40 cm and other methods and the results are considered to be the regional fluxes, only small difference between micrometeorologist for the similar land cover around the study site. The maximum CO2 fluxes of ECS usually occurred around 3 PM and a obvious delay time existed compared to the time of maximum solar radiation. During the experiment period, the sampling inlet of dissolved oxygen methods was changed to the depth of 5 cm and 60 cm below water level every 40 minutes. It can be seen that at both the depth, the dissolved oxygen were similar which implied the stratification effects in water are not significant.
其他識別: U0005-1207201221002700
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