Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5387
標題: 南海海域二氧化碳及能量通量觀測之研究
Observation of CO2 and energy fluxes at South China Sea
作者: 吳庭宇
Wu, Ti-Yu
關鍵字: marine environment;海洋環境;Eddy Covariance system;CO2 fluxes;ship motion correction;WPL correction;渦流協變性系統;海洋校正公式;二氧化碳通量;WPL項校正
出版社: 環境工程學系所
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摘要: 
於海洋環境中應用渦流協變性系統進行大氣和海面各項通量觀測時,需考慮到各種干擾因素。以航行中的研究船而言,首先要考慮到的是船體晃動、轉動以及移動所造成之三維風向誤差,這包含了船的偏向角和船速的校正。此外還要考慮開放式儀器會受到環境因素的干擾,如海水、海鹽對於紅外線氣體分析儀所造成的偵測誤差,也都會使資料的可用率及正確率下降。
本研究中共分析三個海洋上的通量及微氣象觀測實驗,分別在2006年5月於台灣海峽、2006年7月及2007年7月於南海進行。為校正風場的誤差,根據陀螺儀所記錄之偏向角,利用Fujitani (1981)所推導之海洋校正公式進行修正,再進行WPL項(Webb et al., 1980)校正以修正水氣及熱通量之影響,最後計算出正確之二氧化碳通量以及其他能量通量。經過陀螺儀校正後發現二氧化碳通量大多為大氣向海面傳輸,又以中午時最為旺盛;但經過WPL校正後,卻變成相反之趨勢。而在蒸發潛熱通量以及可感熱通量部分,各項校正前後都是由海洋向上傳輸,且最大值在中午發生。此外,根據太陽輻射的測量,中午海面反照率約為0.04~0.08,可更了解海洋環境之參數。

While using Eddy Covariance system to observe air-sea flux in the marine environment, there are many problems that must be considered. On the research ship, the problems that should be considered first are errors of wind velocity resulted from shaking, rotation and movement. In addition, it will reduce usability and accuracy of data when the open path analyzer is covered with water drops and salt.
In this research, three flux experiments were carried out at Taiwan Straits in May 2006, and at South China Sea in July 2006 and 2007. In order to correct the error of the wind field, Fujitani (1981) suggested that true wind velocity should be corrected by ship motion correction according to the angle of deflection. Then the CO2 fluxes should be corrected by the latent heat fluxes and the sensible fluxes (WPL correction) (Webb et al., 1980). After ship motion correction and WPL correction, we can calculate the true fluxes.
The CO2 fluxes including ship motion correction showed a sink from the air to the ocean, especially at noon. But the total CO2 fluxes including WPL correction showed a source from the ocean to the air. Other fluxes, the latent heat fluxes and the sensible fluxes, showed a source from the ocean to the air, and the maximums appeared at noon. In addition, according to the measurement of solar radiation, the albedo of sea was 0.04 - 0.08, it can let us understand the parameter of the marine environment even more.
URI: http://hdl.handle.net/11455/5387
其他識別: U0005-0608200810042600
Appears in Collections:環境工程學系所

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