Ocean-atmosphere fluxes of biogeochemically active constituents have significant impacts on global biogeochemistry and climate, inducing potentially important chemistry-climate feedbacks. The atmospheric deposition of nutrients (e.g., nitrogen, phosphorus, iron) to the ocean influences marine productivity, in turn affecting oceanic CO2 uptake and the emission of climate active species (e.g., nitrous-oxide, dimethyl-sulfide, marine biogenic organics and halogenated species) to the atmosphere. Atmospheric inputs of persistent organic pollutants and elements such as lead, mercury, cadmium, and copper, into the ocean may affect marine ecosystem health. Air-sea exchange is now also known to be an important but uncertain part of the marine microplastic cycle. The emission reductions for air pollution abatement, from both terrestrial and recently maritime transport sources, have repercussions on cloud and aerosol chemical composition, affecting atmospheric acidity, associated chemical processing and impacts via atmospheric deposition on ocean biogeochemistry.
Despite research advances over the past two decades, many of the physical and biogeochemical processes linking the ocean and the atmosphere through the atmospheric fluxes of chemicals, pollutants, nutrient availability, trace-gas sources and sinks, climate relevant species and marine biological productivity, are still not comprehensively understood.
This long-running EGU session on air-sea biogeochemical fluxes will focus this year also on the legacy and activities of the 20-year Surface Ocean - Lower Atmosphere Study (SOLAS). We welcome studies from all areas of the interdisciplinary SOLAS research, including atmospheric deposition of nutrients and pollutants to the ocean and impacts on ocean biogeochemistry, ocean-atmosphere fluxes of climate active species and potential feedbacks to climate, and from a range of analytical approaches (laboratory, in-situ and remote sensing, numerical models).
This session is jointly sponsored by the Surface Ocean-Lower Atmosphere Study (SOLAS ) and GESAMP Working Group 38 on ‘The Atmospheric Input of Chemicals to the Ocean’.