Marine Dimethyl Sulfide Fluxes in the Yellow and East China Seas: Scenario Variation During the 1980s-2090s and Its Drivers

Shedding light on the response of oceanic dimethyl sulfide flux (F-DMS) on the sea shelf to multi-pressures (intensified terrigenous nutrient inputs and climate change) is of great importance for regional aerosol budget. Here, we designed 4-group experiments in scenario (the 1980s, 2010s, 2050s, and 2090s) for the Yellow and East China seas (YECS) based on climate change signals gained from CMIP6 and a 3-dimension biophysical and geochemical model. Results show that the climatological annual mean of YECS's F-DMS will rise from similar to 6 mu mol m(-2) day(-1) in the 1980s to >9 mu mol m(-2) day(-1) in the 2090s under Shared Socioeconomic Pathway (SSP) 2-4.5/5-8.5 scenario, and with multi-pressures, the F-DMS peak in the 2050s is one season earlier when compared to that in the 1980s. The elevated terrigenous inputs affect the phytoplankton biomass and/or community on the inner shelf, leading to the rise and phenology change in the YECS's F-DMS between the1980s and 2010s, while climate change has little impact. The influence of climate change on the F-DMS is projected to increase in the 2050s; climate change will change seasonal pattern of the F-DMS on the central part (middle and outer shelves) of East China Sea (CECS) under every SSP scenario. Thereinto, wind change exerts a crucial role, it will enhance summertime offshore transport and, accordingly, stimulate phytoplankton growth in summer changing the phenology of F-DMS on the CECS.