Controlling factors of annual cycle of dimethylsulfide in the Yellow and East China seas

Shen, Jia-Wei; Zhao, Liang; Zhang, Hong-Hai; Wei, Hao; Guo, Xinyu

Controlling factors of annual cycle of dimethylsulfide in the Yellow and East China seas

2021

Shen, Jia-Wei | Zhao, Liang | Zhang, Hong-Hai | Wei, Hao | Guo, Xinyu

We developed a dimethylsulfide (DMS) module coupled to an ecological dynamics model studying the annual DMS cycle of the Yellow and East China seas (YECS). The model results showed that surface DMS concentrations ([DMS]) peaked in August along the coast, and there exhibited several DMS peaks offshore annually. In addition, surface [DMS] were higher in the Yellow Sea than that in the East China Sea. The annual mean surface [DMS] of the YECS reached to 4.55 nmol/L, and oceanic DMS emissions from this sea area was 6.78 μmol/(m² day). Several sensitivity experiments demonstrated that phytoplankton community and sea water temperature exerted crucial effects on seasonal variations of surface [DMS]; and phytoplankton community or temperature changed the timing of surface DMS peak while photolysis affected the magnitude of [DMS]. Moreover, the effect size of phytoplankton community or water temperature varied spatially.

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