Zamora, Lauren - 613 Seminar Series

The incidence of wildfires in the Arctic and subarctic is increasing; in boreal North America, for example, the burned area is expected to increase by 200- 300% over the next 50-100 years, which previous studies suggest could have a large effect on cloud lifetime, albedo, and precipitation. Any substantial changes to Arctic clouds resulting from biomass burning smoke may in turn impact sensitive Arctic sea ice. However, the interactions between smoke particles and clouds remain poorly understood, in part due to the confounding influence of varying meteorological and surface conditions on cloud properties. Here, we use data from several aircraft campaigns in the Arctic and subarctic (the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites campaign (ARCTAS), the Indirect and Semi-Direct Aerosol Campaign (ISDAC), and the First ISCCP Regional Experiment Arctic Clouds Experiment (FIRE.ACE)) to explore changes in cloud microphysics and radiative forcing in smoky clouds relative to pristine Arctic clouds. I will also present new information on the interactions between biomass burning smoke and ultrafine background Arctic aerosols, and will discuss potential implications for Arctic clouds.