Dimethylsulfide (DMS) is the most abundant biological sulfur compound emitted into the atmosphere, primarily produced by marine phytoplankton. It plays a significant role in Earth’s climate system by encouraging cloud formation. When released from the ocean, DMS undergoes oxidation in the atmosphere and forms sulfate aerosols, which act as cloud condensation nuclei (CCN). These nuclei provide surfaces on which water vapor condenses, leading to cloud droplet formation. By increasing cloud cover, DMS indirectly influences the Earth’s radiation budget, reflecting sunlight back into space and promoting a cooling effect on the planet’s surface. This natural process creates a feedback loop where phytoplankton emissions of DMS help regulate climate by modulating cloudiness. However, the efficiency of DMS in forming clouds can be affected by existing atmospheric conditions, and only a fraction of emitted sulfur from DMS contributes to new cloud formation. Research continues to explore how changes in ocean conditions and climate could impact this critical biogeochemical cycle.
Back to Climate Change Encyclopedia Index Page