碩士 / 國立高雄海洋科技大學 / 海洋環境工程研究所 / 98 / Global oceans are mainly acidifying by the increasing atmospheric CO2 through the air-sea gas exchange. The average pH value of the present open ocean surface seawater is already 0.1 unit lower than the preindustrial values. It is limited what we know about the acidification situation of the waters around Taiwan. In this study, hydrographic data of 20 cruises from 1986~2008 are collected in order to understand the seawater acidification off Southwest Taiwan.
The results show that the acidic rates are more noticeably during spring (across 22 years) and fall (across 10 years), where the pH decreasing rates are in averages of 0.003±0.003 unit yr-1 (P = 0.03) and 0.004±0.003 unit yr-1 (P=0.03), respectively. The pH decreasing rates in summer (across 10 years) and winter (across 7 years) are in averages of 0.004±0.005 unit yr-1 (P=0.11) and 0.005±0.002 unit yr-1 (P=0.51), respectively. Due to the insufficient data, the decreasing rates in summer and winter are not good enough to interpret.
To sum up, the pH decreasing rate off southwestern Taiwan during the last 22 years is in an average of 0.004±0.003 unit yr-1 (P=0.001). Compared to published data from different areas, the seasonal variation is needed more data to analysis.
| Identifer | oai:union.ndltd.org:TW/098NKIM8282003 |
| Date | January 2010 |
| Creators | Chang Cheng-Ming, 張禎明 |
| Contributors | Wang Shu-Lung, 王樹倫 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 75 |
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