Professor Peter Langen, Aarhus University Roskilde, works with climate models specialising in Arctic conditions. His talk will be on Artic Warming: How much is coming from the outside? The abstract for the talk is "Arctic warming is amplified by about a factor of three relative to the global average. Local forcing and feedbacks are clearly having an effect, but it is debated how large a role transports of energy and moisture from lower latitudes are playing. This talk will go through the arguments for and against a significant remote impact and will demonstrate how the seemingly contradictory findings may be reconciled. As climate models are a central tool in the investigations, I will begin with a general introduction to climate modeling."