黄、东海二甲基硫与环境因子的多元分析及建模

Multivariate analysis between dimethylsulfide and environmental factors and modeling in the Yellow Sea and the East China Sea

基于已发表的2005~2015年的文献数据,讨论了黄、东海表层二甲基硫(DMS)和叶绿素a(Chl-a)浓度的时空变化.结果表明:夏季DMS和Chl-a浓度高于冬季;由南至北,年均DMS和Chl-a浓度逐渐升高,且四季间的差异变大.黄、东海表层海水DMS和Chl-a、温度的统计分析表明,春、夏季Chl-a和DMS浓度存在指数关系,而冬季Chl-a和DMS浓度则存在线性关系;不同Chl-a水平下,温度对DMS浓度的影响存在差异.黄、东海表层DMS浓度与Chl-a浓度及温度的多元统计模型结果显示:DMS浓度随着Chl-a浓度增加而增加;在中心温度为21.31℃的温度区间内,DMS浓度较高,且Chl-a浓度越高,这个温度区间越窄.

Based on the published data during 2005 to 2015, the spatial and temporal variation of sea surface DMS and chlorophyll a(Chl-a) was discussed in the Yellow Sea and the East China Sea. DMS and Chl-a concentration in summer were higher than those during winter, and annual concentration of DMS and Chl-a rose from south to north, and the seasonal variation of DMS and Chl-a concentration got bigger with an increase of latitude. Statistical analysis showed that Chl-a had an exponential relation with DMS concentration during spring and summer, while there was a linear relationship during winter. And under conditions of different Chl-a concentration levels, the impact of temperature on DMS concentration were different. A multivariate statistical model was established in this work, in which the sea surface temperature and the surface Chl-a concentration was used to estimate the surface DMS concentration. The DMS concentration rose with the increase of the Chl-a concentration. The DMS concentration was relatively high within a range of temperature with the central temperature of 21.31℃, and the higher the Chl-a concentration was, the narrower the range of temperature could be.