夏季东海生源硫的分布、通量及其对非海盐硫酸盐的贡献

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摘要

对2012年6月东海表层海水中二甲基硫（DMS）、二甲巯基丙酸内盐（DMSP）和二甲亚砜（DMSO）的浓度分布特征及其影响因素进行了研究，并估算了DMS的海-气通量及其对大气气溶胶中非海盐硫酸盐（nss-SO₄^2-）的贡献率.结果表明，DMS、溶解态DMSP（DMSPd）、颗粒态DMSP（DMSPp）、溶解态DMSO（DMSOd）和颗粒态DMSO（DMSOp）的浓度平均值±标准偏差为（5.71±5.23），（5.94±3.68），（23.84±14.15），（9.14±10.52）和（11.01±5.81）nmol/L.DMS、DMSP和DMSOp浓度均在28oN~29oN，122°E~123.5°E海域呈现高值中心，沿中心向外扩散降低，并且与叶绿素a（Chl-a）的分布趋势基本一致.除DMSOd外，3种二甲基硫化物与Chl-a表现出显著的相关性，表明浮游植物生物量是影响东海生源有机硫化物生产分布的关键因素.此外，夏季东海DMS海-气通量介于（0.93~101.02）μmol/（m²·d），平均值±标准偏差为（18.13±21.42）μmol/（m²·d）.夏季东海生源硫释放对nss-SO₄^2-的贡献率仅为2.2%，表明人为排放是东海大气气溶胶中nss-SO₄^2-的主要来源.

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关键词 ：二甲基硫, 二甲巯基丙酸内盐, 二甲亚砜, 海-气通量, 非海盐硫酸盐, 东海

Abstract：

The spatial distributions of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), dimethylsulfoxide (DMSO) as well as their control factors were studied in the East China Sea during June 2012. The sea-to-air flux of DMS and its contribution to non-sea-salt sulfate (nss-SO₄^2-) in atmospheric sulphate aerosol were also estimated. The average concentrations of DMS, dissolved DMSP (DMSPd), particulate DMSP (DMSPp), dissolved DMSO (DMSOd) and particulate DMSO (DMSOp) in the surface seawater were (5.71±5.23), (5.94±3.68), (23.84±14.15), (9.14±10.52) and (11.01±5.81) nmol/L, respectively. Concentrations of DMS, DMSP and DMSOp formed high values center in the region of 28°N~29°N and 122°E~123.5°E and declined around this region diffusively, exhibiting similar distribution patterns to chlorophyll a (Chl-a). Concentrations of DMS, DMSPd, DMSPp and DMSOp were significantly correlated with the levels of Chl-a, suggesting that phytoplankton biomass might play an important role in controlling the production and distributions of biogenic sulfur compounds in the East China Sea. The sea-to-air fluxes of DMS in the study area varied from 0.93 to 101.02 μmol/(m²·d), with an average of (18.13±21.42) μmol/(m²·d). The contribution of biogenic nss-SO₄^2- to the total nss-SO₄^2- in the atmospheric aerosol was only 2.2%, indicating that anthropogenic emission was the major source of atmospheric sulfur over the East China Sea in summer.

Key words： dimethylsulfide dimethylsulfoniopropionate dimethylsulfoxide sea-to-air flux non-sea-salt sulfate East China Sea

收稿日期: 2016-04-15

PACS:

X142

基金资助:

国家自然科学基金项目（41576073，41306069，41320104008）；山东省博士基金（BS2013HZ011）；中央高校基本科研项目自主基金（201513049）；山东省“泰山学者”建设工程专项

通讯作者: 杨桂朋,教授,gpyang@ouc.edu.cn E-mail: gpyang@ouc.edu.cn

作者简介: 孙婧(1991-),女,内蒙古土默特左旗人,中国海洋大学化学化工学院硕士研究生,主要从事生源硫的生物地球化学研究.

引用本文:

孙婧, 张洪海, 张升辉, 高楠, 杨桂朋. 夏季东海生源硫的分布、通量及其对非海盐硫酸盐的贡献[J]. 中国环境科学, 2016, 36(11): 3456-3464. SUN Jing, ZHANG Hong-hai, ZHANG Sheng-hui, GAO Nan, YANG Gui-peng. Distribution and fluxes of biogenic sulfur in the East China Sea and its contribution to the non-sea-salt sulfate in atmospheric aerosol in summer. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(11): 3456-3464.

链接本文:

http://manu36.magtech.com.cn/Jweb_zghjkx/CN/ 或 http://manu36.magtech.com.cn/Jweb_zghjkx/CN/Y2016/V36/I11/3456

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