https://scholars.lib.ntu.edu.tw/handle/123456789/339235
標題: | 'Excess nitrate' in the East China Sea | 作者: | SU-CHENG PAI | 關鍵字: | Changjiang; East China Sea; Kuroshio; Nutrients | 公開日期: | 1998 | 卷: | 46 | 期: | 3 | 起(迄)頁: | 411-418 | 來源出版物: | Estuarine, Coastal and Shelf Science | 摘要: | 'Excess nitrate' was found in waters with salinities below 30.5 in the top 10-15 m of waters covering one-third to one-half of the East China Sea in the summer of 1992. In these waters, significant concentrations of [nitrate+nitrite], up to about 6 μM, could be found while the corresponding concentrations of phosphate remained at or below 0.07 μM. Thus, the ratio of [nitrate+nitrite] to phosphate in these waters was far in excess of that at which these two essential nutrients are utilized by marine phytoplankton. ('Excess nitrate' is the concentration of [nitrate+nitrite] in excess of that which may be utilized by marine phytoplankton at the observed concentration of phosphate.) As a result, in contrast to the open marine systems in general, primary production in a significant portion of the East China Sea may be phosphate-limiting rather than nitrogen-limiting. The area covered by this layer of combined nitrogen-rich water could be temporally variable. While no 'excess nitrate' was detected in the south-eastern East China Sea along the Chinese coasts in the summer of 1992, significant quantities of 'excess nitrate', up to 4 μM, were found at the same location in the early spring of 1993 in waters with salinities as high as 34.5. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0032033816&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/339235 |
DOI: | 10.1006/ecss.1997.0287 | SDG/關鍵字: | nitrate; nutrients; phosphate; primary production; salinity; East China Sea |
顯示於: | 海洋研究所 |
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