东海二甲基硫时空变化特征及影响因素分析  

Tempo-spatial variations and influencing factors of dimethyl sulfide in the East China Sea

作　　者：李思雨 孙群 姚洁 赵亮 LI Si-yu;SUN Qun;YAO Jie;ZHAO Liang(College of Marine and Environmental Sciences,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457

出　　处：《中国环境科学》2023年第5期2470-2479,共10页China Environmental Science

基　　金：国家自然科学基金资助项目(41876018)。

摘　　要：基于已建立的DMS广义可加混合模型(GAMM),采用东海现场实测数据和卫星遥感海表温度(SST)和局地校正叶绿素a(Chl-a)v5.0(LMC v5.0)数据,获得1998-2020年共23年的东海表层DMS数据集,分析了东海表层海水DMS浓度时空特征和影响因素.结果表明:东海表层海水DMS年平均浓度为2.67nmol/L,呈现外海低、近岸高的空间分布特征,并具有显著的季节变化:春夏季浓度较高,秋冬季浓度偏低.根据所获得的23年的数据,东海表层海水DMS浓度年际变化具有明显空间差异性,近岸呈现明显先上升后降低的年际变化特征,而外海的年际变化不明显.春、夏两季东海表层海水DMS浓度空间分布差异主要受Chl-a影响,秋、冬两季其差异主要受Chl-a和SST协同作用的影响.Chl-a是影响长江口及邻近海域DMS年际变化的主要因素,SST是影响苏北沿岸DMS年际变化的主要因素.河流输入的营养盐可能是长江口DMS的影响因素.春季(冬季)海表风速和长江口DMS存在相似(相反)年际变化特征.Based on the established DMS generalized additive mix model(GAMM),the field data from the East China Sea(ECS),satellite remotely sensed sea surface temperature(SST),and local modified chlorophyll a(Chl-a)v5.0(LMC v5.0)data were used to obtain the surface dimethyl sulfide(DMS)data set for the period from 1998 to 2020,and the tempo-spatial variations and influencing factors of surface water DMS were evaluated.The results show that the annual average DMS concentration in the surface water of the ECS was 2.67nmol/L,being low in offshore areas and high in nearshore areas.And there were significant seasonal variations in DMS concentration,being higher in spring and summer and lower in autumn and winter.Based on the 23-year data,the interannual DMS concentrations in the ECS surface water exhibited obvious spatial variations,rising first and then decreasing,particularly more significant in the nearshore areas than in the offshore ones.The difference in the spatial distribution of DMS concentration was mainly affected by Chl-a in spring and summer and by the synergistic effect of Chl-a and SST in autumn and winter.Chl-a was the main factor affecting the interannual variations of DMS in the Changjiang River Estuary and its adjacent waters,and SST was the main factor affecting its interannual variations along the northern coastal area of Jiangsu Province.Nutrient salts imported from rivers could be an influencing factor for DMS in the Changjiang River Estuary.The spring(winter)sea surface wind speeds and the interannual DMS variations in the Changjiang River Estuary had similar(opposite)characteristics.

关 键 词：二甲基硫 广义可加混合模型 东海 时空变化 影响因素 

分 类 号：X55[环境科学与工程—环境工程]