Joint Seminar: Long-range pollution transport to the Arctic and its role in modulating regional aerosol-cloud-climate interactions

Long-range pollution transport to the Arctic has a century-long history
of discovery and re-discovery. Today it is attracting interest for its
potential contributions to amplified Arctic warming and associated
sea-ice melting. One component of this problem is the interactions
between pollutant aerosols and Arctic clouds. The problem is
interesting, not only for its relevance to the Arctic surface radiation
balance, but also because Arctic clouds tend to be dynamically quiet. In
much the same manner as ship-tracks at mid-latitudes, they provide an
intriguing test-bed for testing hypotheses related to
aerosol-cloud-radiation feedback mechanisms. In fact, in the Arctic,
several rarely considered physical interactions between aerosols and
clouds appear to be particularly relevant and can result in pronounced
regional shortwave and longwave radiative perturbations. However, the
notion of "cause and effect" must be considered with caution. The
meaning of the concept is muddied by important feedbacks associated with
wet scavenging of aerosol by precipitation and the interplay between
radiation and dynamics in stratiform clouds.




13:30 Uhr


Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg


Timothy Garett, University of Utah


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