中国海洋大学化学化工学院,海洋化学理论与工程技术教育部重点实验室;青岛海洋科技中心海洋生态与环境科学功能实验室;中国海洋大学海洋化学研究所;
二甲基硫(Dimethylsulfide, DMS)和β-二甲基巯基丙酸内盐(Dimethylsulfoniopropionate, DMSP)在全球硫循环以及全球气候变化中具有重要作用。本文研究了2022年冬季南海海域DMS和DMSP的浓度分布特征，测定了表层海水DMS光化学氧化速率，估算了DMS的海-气通量。结果表明，表层海水中DMS、溶解态DMSP(DMSPd)和颗粒态DMSP(DMSPp)的浓度变化范围分别为0.43～9.69、0.96～8.47和0.04～69.39 nmol·L-1,平均值分别为(3.61±2.65)、(3.47±2.58)和(22.48±23.06) nmol·L-1。DMS整体分布呈现北低南高的趋势，最高值出现在菲律宾群岛附近，最低值出现在海南岛附近海域。DMSPp和DMSPd浓度均在海南岛附近出现最大值，其中DMSPp浓度与Chl a浓度呈显著正相关，说明DMSPp浓度主要受浮游植物控制。DMS光化学氧化速率变化范围为5.06～17.51 nmol·L-1·d-1,平均值为(10.26±3.96) nmol·L-1·d-1,UVA、UVB和可见光对DMS光化学氧化的贡献率的平均值分别为45.5%、41.2%和13.3%,UV波段光是冬季南海DMS光化学氧化的主要动力。南海海域DMS海-气通量的变化范围为0.77～30.51μmol·m-2·d-1,平均值为(11.54±9.48)μmol·m-2·d-1,高DMS海-气通量说明南海对全球硫循环具有重要作用。
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基本信息:
DOI：10.16441/j.cnki.hdxb.20240074
中图分类号:P734
引用信息:
[1]李尧,杨桂朋,于娟.冬季南海海水二甲基硫化物的分布、光化学氧化和海-气通量研究[J].中国海洋大学学报(自然科学版),2025,55(04):90-100.DOI:10.16441/j.cnki.hdxb.20240074.
基金信息:
国家自然科学基金项目(41976038,42149906)资助~~