碩士 / 中興大學 / 環境工程學系所 / 99 / Open path CO2 analyzer has been used in CO2 flux measurements over ocean recently. CO2 flux has been estimated by close path CO2 analyzer for decades.
To compare the CO2 flux of open path and close path methods, three experiments were set in the study: (1) using open path eddy covariance system (ECS) and close path Underway pCO2 system to measure CO2 fluxes over pool in Black-faced Spoonbill Conservation Association in Cigu Dist. The results showed that the CO2 flux of open path CO2 analyzer is up to 100 times larger than that of close path, but the direction of flux is opposite; (2) in the second case, the third method, profile method was added to estimate CO2 flux. The result of profile method showed that the tendency of flux is the same as ECS, but the flux of profile method is about 8 times larger than open path, however, direction of flux was still inconsistent with Underway pCO2 system; (3) the results of the experiment in a fish pond which has stronger ecosphere activities showed that the flux of open path is positive (sink), and it’s negative (source) for close path method. In addition, the diurnal cycle of CO2 concentration is obvious where it is lower in the daytime and higher at night.
The PKT Method was used to calibrate the effect between relative humidity and CO2 concentration in case (1) and case (3). In both cases, PKT Method can correct the biases resulted from the relative humidity after WPL correction, the CO2 flux after calibrating by PKT Method was smaller than WPL calibration method, and the flux in May 14th is similar to the flux of Underway pCO2 system, but the direction of flux is still opposite.
After adding pH parameter and CO2 atmospheric concentration measured at 1.5 m into the CO2 flux calculation of Underway pCO2 system, the results showed that the flux and the direction of flux will be consistent with ECS.
| Identifer | oai:union.ndltd.org:TW/099NCHU5087095 |
| Date | January 2011 |
| Creators | Yung-Tsang Chang, 張詠翔 |
| Contributors | Ben-Jei Tsuang, 莊秉潔 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 134 |
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