碩士 / 臺灣大學 / 大氣科學研究所 / 95 / Marine phytoplankton is the basis of the ocean ecosystem. It can absorb carbon dioxide and release DMS, both of which can bring up negative feedbacks to climate forcing. Martin (1988) proposed the Iron Hypothesis, which pointed out that iron is the limiting nutrient of phytoplankton growth in some marine regions. In the open ocean, iron input to the ocean mostly comes from the deposition of atmospheric dust. Besides, anthropogenic pollutants, as potentials sources themselves to the photoplankton, could also enhance the dissolvability of iron in the ocean. So, anthropogenic pollutants are also discussed in this study.
Therefore, the goal of this study is to evaluate the impact of Asian atmospheric input on the primary production over the Northwestern Pacific Ocean (NWPO). We first used a dust deflation and transport model (TAQM/kosa and TAQM) to simulate dust deposition and pollution deposition onto the oceans, and then compared simulation results with the phytoplankton concentration (in chlorophyll-a) observed by the NASA/SeaWiFS (Sea-viewing Wide Field of view Sensor) Satellite for the period of January 2001 to December 2005.
From the analysis of monthly data, we found high correlations (0.6~0.8) between chlorophyll-a and dust deposition around 30°N~40°N of NWPO, and high correlation (0.5~0.7) between chlorophyll-a and AOD around 25°N~35°N of NWPO. Through event studies we found 36 events that atmospheric input stimulated phytoplankton bloom. In these events the most significant event H1 shows that in this dust event phytoplankton concentration increased by 0.2~2 mg/m3 (2~8 times) around 40°N/150°E. Besides, in event L11 phytoplankton concentration increased by 0.04~0.2 mg/m3 (2~3 times) around 20°N/155°E after nitrate deposition. This shows nitrate deposition is also an important factor to influence phytoplankton bloom.
| Identifer | oai:union.ndltd.org:TW/095NTU05022016 |
| Date | January 2007 |
| Creators | Yi-Chiu Lin, 林宜萩 |
| Contributors | 陳正平 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 73 |
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