长江口及其邻近海域2012年3月和7月溶解态铝的分布特征分析

发布时间：2018-04-06 01:14

本文选题：溶解态铝　切入点：分布　出处：《海洋学报》2016年02期

【摘要】：分别于2012年3月和7月对长江口及其邻近海域水体中溶解态铝的分布及其影响因素进行了研究,并在2012年3月至2013年11月期间对长江徐六泾进行了连续观测。结果表明,徐六泾溶解态铝在夏季出现最高值,在冬季呈现最低值,平均值分别为(313±130)nmol/L和(140±43)nmol/L,表现出与径流量相似的季节变化规律。受陆源输入变化的影响,长江口溶解态铝的浓度由近岸向外海逐渐降低,且呈现出明显的季节性差异,即7月明显高于3月。3月表、底层海水中溶解态铝的浓度范围分别为21~129nmol/L和27~146nmol/L,平均值分别为(49±21)nmol/L和(59±27)nmol/L;7月表、底层溶解态铝的浓度范围分别为6~332nmol/L和9~252nmol/L,平均值分别为(66±69)nmol/L和(83±74)nmol/L。在7月,表、底层溶解态铝呈现显著性差异,底层沉积物的再悬浮可能是造成差异的主要原因。调查结果表明,溶解态铝在长江口呈现出清除型行为,清除主要发生在咸淡水混合初期,初步计算出7月份溶解态铝的清除率约为55%。
[Abstract]:The distribution of dissolved aluminum in the Yangtze Estuary and its adjacent waters and its influencing factors were studied in March and July 2012, respectively, and the continuous observation of Xuliujing in the Yangtze River from March 2012 to November 2013 was carried out.The results show that the dissolved aluminum in Xuliujing has the highest value in summer and the lowest in winter. The average values are 313 卤130)nmol/L and 140 卤43nmol / L, respectively, showing a seasonal variation pattern similar to that of runoff.The concentration of dissolved aluminum in the Changjiang Estuary decreases gradually from the coastal to the offshore due to the variation of the terrestrial source input, and shows a significant seasonal difference, that is, July is obviously higher than that in March and March, and the distribution of dissolved aluminum in the Changjiang Estuary is obviously higher than that in March and March.The concentration range of dissolved aluminum in the bottom water is 21~129nmol/L and 27 ~ 146nmol / L, respectively, and the average values are 49 卤21)nmol/L and 59 卤27nmol / L, respectively. In July table, the concentration range of dissolved aluminum in the bottom layer is 6~332nmol/L and 9252nmol / L, respectively, and the average values are (66 卤69)nmol/L) and (83 卤74nmol / L), respectively.In July, there was a significant difference in dissolved aluminum in the bottom layer, and the resuspension of the bottom sediment might be the main cause of the difference.The results show that dissolved aluminum in the Changjiang Estuary shows a scavenging behavior, which mainly occurs in the early stage of salt-fresh water mixing. The preliminary calculation shows that the removal rate of dissolved aluminum in July is about 55.
【作者单位】：中国海洋大学海洋化学理论与工程技术教育部重点实验室;华东师范大学河口海岸学国家重点实验室;
【基金】：国家基础研究发展规划项目(2011CB409801) 国家自然科学基金(41176096)
【分类号】：P734.4

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