Ole Rømer Colloquium - Joint for Department of Physics and Astronomy and Department of Chemistry

Speaker:

Lucy J. Carpenter,  Wolfson Atmospheric Chemistry Laboratories (WACL), University of York, UK

Host:

Henrik B. Pedersen and Merete Bilde

Title:

Air-Sea Feedbacks: The Changing Impacts of Marine Halogens on the Atmosphere

Abstract:

The halogens chlorine, bromine & iodine are chemical elements that play a fundamental role in the Earth's atmosphere and are associated with a range of environmental issues.  In addition to their role in stratospheric chemistry, it emerged more recently that halogens have a pervasive impact on tropospheric chemistry across the world’s oceans. The majority of halogen-related surface ozone destruction is attributable to iodine chemistry, the main source of which is believed to be inorganic iodine emitted from the air-sea interface.   This reaction also directly removes O₃ from the atmosphere, representing a negative feedback mechanism for tropospheric ozone.  This presentation discusses advances made in understanding the chemistry and exchange of halogenated gases across the ocean surface and the subsequent and potentially changing impacts on the atmosphere.

Coffee/tea and cake will be available from 15:00