| Summary: | POLAR 2018 - XXXV SCAR Meetings and SCAR/IASC Open Science Conference, 19-23 June 2018, Davos, Switzerland.-- 1 page Climate warming affects the development and distribution of sea ice around Antarctica and its associated ecosystems, but at present the evidence of feedbacks on climate through ecosystem-derived changes in the atmosphere is sparse. The PEGASO cruise visited the Antarctic region of the South Orkney Islands at the northern edge of the Weddell Sea, and the Subantarctic region of the South Georgia Island, in summer 2015. Each region was studied intensively in lagrangian mode over a few days and diel cycles. Oceanic measurements of plankton abundance, diversity, activity and physiology, plus organic matter characteristics, aerosol-forming organic volatile compounds (dimethylsulfide, methylamines, isoprene, halomethanes) and nutrient concentrations, were compared with simultaneous atmospheric measurements of aerosol numbers, size and composition. Samples of surface seawater and melted sea ice were bubbled in an aerosol-generation tank and the characteristics of the sprayed aerosol were monitored. This integrated study allowed to link phytoplankton bloom stages and the emission of aerosol-forming particulate and gaseous substances. Our findings call for greater chemical and source diversity in the modeling efforts linking the marine ecosystem to aerosol-mediated climate effects in the Southern Ocean Peer Reviewed
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