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The Arctic Boundary Layer: Coupling Clouds & Sea Ice

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The observed rapid decline in summer Arctic sea ice extent, and overall thinning of the ice are not well reproduced by models. While there are deficiencies in the representation of sea ice, at least part of the problem lies in the atmosphere. Boundary layer clouds are a first order control on the surface energy budget through their control of solar and infra red radiation, but are poorly represented in models. Turbulent exchange at the surface is also not well parameterized over sea ice. Improvements in understanding the controlling processes – including turbulence, aerosol/cloud interactions, boundary layer thermodynamic structure – requires in situ measurements. Here I will discuss results from recent measurement campaigns in the Arctic: ASCOS , ACCACIA and ACSE , each taking a different approach to studying the Arctic marine atmospheric boundary layer.

This talk is part of the British Antarctic Survey series.

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