东海二甲基硫时空变化特征及影响因素分析

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Abstract 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.

Key words： dimethylsulfur generalized additive mixed model East China Sea spatial and temporal variation influencing factor

Received: 08 September 2022

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	LI Si-yu
	SUN Qun
	YAO Jie
	ZHAO Liang

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LI Si-yu,SUN Qun,YAO Jie等. Tempo-spatial variations and influencing factors of dimethyl sulfide in the East China Sea[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2470-2479.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2470

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