[A-CG41] Biogeochemical linkages between the surface ocean and atmosphere

[ACG41-02] The biogenic sulfur cycle in a coupled ocean-sea ice-atmosphere system

*Sakiko Ishino¹, Hélène Angot², Thorsten Bartels-Rausch³, Antoine Haddon⁴, Hakase Hayashida⁵, Sankirna Joge⁶, Hyung-Gyu Lim⁷, Anoop Sharad Mahajan⁶, Louis Marelle⁸, Kerri Pratt⁹, Ilka Peeken¹⁰, Nadja Steiner^4,11, Jacqueline Stefels¹², Jennie Thomas², Megan D Willis¹³ (1.Institute of Nature and Environmental Technology, Kanazawa University, 2.Univ. Grenoble Alpes, CNRS, INRAE, IRD, Grenoble INP, IGE, 38000 Grenoble, France, 3.Laboratory of Atmsopheric Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerlan, 4.School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada, 5.Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan, 6.Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India, 7.Korea Institute of Ocean Science and Technology, Busan, South Korea, 8.LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, 4 place Jussieu, 75005, Paris, France, 9.Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States, 10.Alfred Wegener Institute Helmholtz-Zentrum fur Polar- und Meeresforschung, Bremerhaven, Germany, 11.Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada, 12.The Groningen Institute of Evolutionary Life Sciences, University of Groningen, Groningen, the Netherlands, 13.Department of Chemistry, Colorado State University, Fort Collins, CO, USA)

Keywords:Dimethyl sulfide (DMS), Arctic, Antarctic, Sea ice, Aerosol, Biogeochemistry

Marine biogenic reduced sulfur compounds, such as dimethyl sulfide (DMS), are key contributors to the polar aerosol population during biologically active seasons. In polar regions, sea ice serves an important dual role in the biogenic sulfur cycle by providing a habitat for DMS-producing microorganisms and modulating sea-to-air DMS emission. This polar-specific marine biogenic sulfur cycle is poised to undergo significant changes in response to the sea ice thinning and reduction, which is already emerging in the Arctic and a part of the Antarctic coast. However, the complexity of sea ice biogeochemical DMS production, emission, and the subsequent aerosol formation processes, coupled with their fine spatial and temporal scales, presents significant challenges to incorporating these processes into Earth System Models and understanding potential climate feedback.
In the SCOR working group CIce2Clouds, we have synthesized knowns and unknowns about this polar sulfur cycle by developing a mutual understanding between atmospheric chemistry and sea-ice biogeochemistry communities. This presentation introduces an overview of the system and highlights the knowledge gaps that are shared through our discussion.