This session is intended to provide an interdisciplinary forum to bring together researchers working in the areas of meteorology, atmospheric chemistry, air quality, biogeochemistry, stable isotope research, oceanography, and climate in the polar regions.

The emphasis is on the role of polar boundary layer processes that mediate exchange fluxes of heat, momentum and mass between the Earth's surface (snowpack, sea-ice, ocean and land) and the atmosphere as well as the local to large-scale influences on these exchanges. An adequate understanding and quantification of these processes is necessary to improve modeling and prediction of future changes in the polar regions and their teleconnections with mid-latitude weather and climate, including meridional transport of heat, moisture, chemical trace species, aerosols and isotopic tracers; and regional emission and vertical mixing of climate active trace gases and aerosol, such as cloud-forming particles (CCN/INP) and their precursors.
It is expected that observations from recent field campaigns, data from existing networks, and modeling efforts, will help diagnose long-range and local moisture, trace gas and aerosol sources as well as the coupling between local and large-scale dynamics and their impacts on climate, health and ecosystems. The reporting on progress as well as critical knowledge gaps will help define upcoming research programmes as part of Antarctica InSync and the International Polar Year 2032-33.

We encourage submissions such as (but not limited to):
(1) External controls on the boundary layer such as clouds, radiation and long-range transport processes
(2) Results from field programs and routine observatories, insights from laboratory studies, and advances in modeling and reanalysis,
(3) Use of data from pan-Arctic and Antarctic observing networks,
(4) Surface processes involving snow, sea-ice, ocean, land/atmosphere chemical and isotope exchanges, and natural aerosol sources
(5) Studies on atmospheric chemistry and air pollution during polar winter
(6) The role of boundary layers in polar climate change and implications of climate change for surface exchange processes, especially in the context of reduced sea ice, wetter snow packs, increased glacial discharge and physical and chemical changes associated with increasing fractions of first year sea ice and more open ocean areas.