台湾浅滩南部叶绿素a多周日的变化

１９９７年８月，在台湾浅滩南部的９７０１和９７０４测站对叶绿素ａ的多周日变化进行了研究，结果表明，叶绿素ａ的垂直分布结构可分为三部分：上均匀层，下均匀层，高含量层，一均匀层和下均匀层的叶绿素ａ含量低，且无明显的周日变化，在高含量层中，叶绿素ａ含量最高，其平均值具有明显周日变化，峰值均出现在每天的１２：００或１５：００，而夜间则最低，叶绿素ａ的这一周日 变化与潮汐现象不密切，认为与浮游动物的摄食有关，另一个可能的原因是浮游植物细胞内叶绿素ａ浓度的变化，而高含量层中各层叶绿素ａ的周日变化与叶绿素ａ最大值的垂直移动有关，叶绿素ａ高含量层存在的周期性上下移动现象，是潮汐作用的结果，叶绿素ａ高含量层厚度与温跃层强度呈密切反相关关系。

A study of multi-diel variation of chlorophyll a in southern part of Taiwan shoal

In situ investigation of multi diel variation of chlorophyll a was conducted in the southern part of Taiwan shoal during August 1997. The results showed that the profiles of chlorophyll a were composed of three parts: upper homogeneous layer(UH), lower homogeneous layer(UL) and high chlorophyll a layer(HL). The daily change of chlorophyll a arerage content occurred mainly in HL, and not related to tidal motion. The chlorophyll a peaks at 12:00 or 15:00 in daytime, and the minimum in nighttime may be related to zooplankton grazing and intercellular variations of phytoplankton chlorophyll.And the periodic vertical move ment of HL result from the tidel motion. The HL thickness was closely in contrary relation to thermocline strength.