黄海近岸溶解活性态铁定点连续分析研究

铁（Fe）是海洋浮游植物生长必需的微量元素，也是影响海洋初级生产力的关键因素。溶解活性态铁（DR_Fe）是溶解态Fe的主要组成之一，与海洋生物体的吸收密切相关。本文通过对黄海近岸海水30天定点连续分析监测，研究了黄海近岸海水中DR_Fe在高、低潮时的浓度变化特征，分析监测了潮汐作用对DR_Fe的影响，并探讨了DR_Fe与海水理化参数间的关系。研究表明:高潮时DR_Fe浓度略高于低潮，最大浓度差为2.32 nmol/L，最小浓度差为0.44 nmol/L；DR_Fe浓度月变化差异不大，其范围为4.06～8.34 nmol/L，平均浓度为5.70 nmol/L；5月初，DR_Fe浓度较高，随后逐渐下降；海水温度升高会促进浮游植物生长，致使Chl a含量增加，同时加速DR_Fe的消耗。

Continuous analysis of dissolved reactive iron at fixed-point of Yellow Sea coast

Iron (Fe) is an essential micronutrient for the growth of marine phytoplankton and a key factor to affect marine primary productivity. Dissolved reactive iron (DR_Fe), one of the main components of dissolved Fe, is closely related to the absorption of marine organisms. In this paper, the variation characteristics of DR_Fe concentration at high tide and low tide were studied by continuous monitoring at Yellow Sea coast for 30 days. The effect of tidal action on DR_Fe concentration was analyzed, and the relationship between DR_Fe concentration and physicochemical parameters of seawater was further discussed. This study showed that the DR_Fe concentration at high tide was slightly higher than that at low tide, with a maximum concentration difference of 2.32 nmol/L and a minimum concentration difference of 0.44 nmol/L. The monthly variation of DR_Fe concentration was not significant in May, ranging from 4.06 to 8.34 nmol/L, with an average concentration of 5.70 nmol/L. DR_Fe concentrations were higher at the beginning of the month and then gradually declined. The increase of seawater temperature will promote the growth of phytoplankton and increase of chlorophyll a content, which will accelerate the consumption of DR_Fe.