Contribution of chlorophyll derivatives in ocean organic matter pool-evaluation by comprehensive method

提出了估算叶绿素衍生物对海洋有机碳库贡献的新方法。该方法通过铬酸氧化将叶绿素分子转化为氯。使用真实的色素进行研究，证明了衍生物的定量估计。利用天然浮游植物种群进行了叶绿素分解实验。有荧光的叶绿素分解速度快，无荧光的叶绿素分解速度慢。在东海的观测表明，无荧光的叶绿素浓度比有荧光的浓度高20倍。然而，叶绿素衍生物对颗粒物有机碳的贡献约为百分之几。对溶解色素的研究是阐明海洋有机碳库贡献的必要条件。

The new method to estimate the contribution of chlorophyll derivatives to oceanic organic carbon pool has been developed. In this method, chlorophyll molecule was converted to chlorine by chromic acid oxidation. The study using authentic chloropigments proved the quantitative estimation of derivatives. The decomposition experiments of chlorophyll were conducted using natural phytoplankton populations. Though chloropigments with fluorescence decomposed rapidly, the decomposition rate of chloropigments without fluorescence were low. Observation of in the East China Sea showed that the concentration of chloropigments without fluorescence was 20 times higher than that with fluorescence. However, the contribution of chlorophyll derivatives was about a few% to particulate organic carbon. The study on the dissolved chloropigments is necessary to elucidate the contribution to ocean organic carbon pool.