Investigations on the impact of emissions into a remote marine atmospheric boundary layer

With about 650000 people living in Alaska most of them in the 3 major cities, air is relatively pristine in areas remote from these "areal point sources". Thus, shipping, oil drilling and production are the main anthropogenic emission sources remote from these cities. The ship traffic including cruises along Alaska's coasts is expected to increase as sea-ice recedes. These different emission sources yield quite different atmospheric composition and local air quality impacts. While this may make understanding Alaska's atmospheric composition at-large a challenging task, it also provides great opportunities to examine impacts without cofounders. The talk will present results on these emission sources impact on the Alaska atmosphere, and insight into the challenges.