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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。
Abstract：Dimethylsulfide(DMS) and dimethylsulfoniopropionate(DMSP) play an important role in the global sulfur cycle and climate regulation. We studied the distribution characteristics of DMS and DMSP in the South China Sea in Winter of 2022, measured the photochemical oxidation rate of DMS in surface seawater, and estimated the sea-air flux of DMS in this study. The results showed that the concentrations of DMS, dissolved DMSP(DMSPd) and particulate DMSP(DMSPp) in surface seawater ranged from 0.43 to 9.69 nmol·L-1, 0.96 to 8.47 nmol·L-1, and 0.04 to 69.39 nmol·L-1, with mean values of(3.61±2.65),(3.47±2.58), and(22.48±23.06) nmol·L-1, respectively. The DMS distribution showed a trend of low in the north and high in the south, with the highest value occurring near the Philippines Islands and the lowest value appeared near the Hainan Island. Both DMSPp and DMSPd showed maximum values near the Hainan Island. DMSPp showed a significantly positive correlation with Chl a, indicating that DMSPp concentrations were mainly controlled by phytoplankton abundances. The photochemical oxidation rate of DMS ranged from 5.06 to 17.51 nmol·L-1·d-1, with amean value of(10.26±3.96) nmol·L-1·d-1. The average contributions of UVA, UVB, and visible light to DMS photochemical oxidation rate were calculated to be 45.5%, 41.2% and 13.3%, respectively. UV light was the main driving force for the photochemical oxidation of DMS. The sea-air DMS flux in the South China Sea ranged from 0.77 to 30.51 μmol·m-2·d-1,with a mean value of 11.54 μmol·m-2·d-1. The high DMS flux suggests that the South China Sea plays an important role in the global sulfur cycle.
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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~~