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2002年10～11月在15°00′～27°40′N,121°30′～131°00′E的吕宋岛、台湾岛和琉球群岛以东的西北太平洋副热带环流区设测站121个,观测了该区表层和水柱中的叶绿素a质量浓度分布和光合浮游生物粒级结构。结果表明,观测海区秋季叶绿素a的质量浓度较低,变化幅度较小,变幅范围为0.039～0.271μg/dm3。台湾岛至琉球群岛以东的北部测区平均叶绿素a质量浓度高于吕宋岛以东的南部测区。叶绿素a含量的垂直分布在真光层内随深度的增加而增大,在真光层以下却随深度增加而降低。表层水的光合浮游植物细胞丰度较低,并以小粒径的硅藻占优势,细胞丰度约为103个/dm3。粒度分级结果表明,Pico级份的光合浮游生物占绝对优势(86%),Nano级份次之(11%),大细胞的Net级份所占比例最小(3%),呈现出微微型光合浮游生物在寡营养海区居重要地位的状况。
The stations of the Northwest Pacific subtropical circulation east of Luzon Island, Taiwan Island and Ryukyu Islands from 15 ° 00’-27 ° 40’N and 121 ° 30’-131 ° 00’E from October to November 2002 A, the observed surface and water column in the area of chlorophyll a concentration distribution and photosynthetic planktonic particle size structure. The results showed that the mass concentration of chlorophyll a in autumn was lower and the variation range was smaller with the range of 0.039 ~ 0.271 μg / dm3. The average concentration of chlorophyll a in the northern part of Taiwan Island to the Ryukyu Islands was higher than that in the southern part of the eastern part of Luzon Island. The vertical distribution of chlorophyll a content increases with the depth in the euphoria, but decreases with the depth below the eucenolus. Surface water photosynthetic phytoplankton cell abundance is low, and to a small particle size of diatoms predominant cell abundance of about 103 / dm3. Particle size grading results showed that photosynthetic plankton accounted for 86%, Pano fraction photosynthetic plankton took the second place (11%), and the largest proportion of Net fraction of macrophages (3%) showed pico photosynthesis Plankton in the oligotrophic sea area occupies an important position.