10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Variations in Composition of Particles Sampled at Different Altitudes in the North Atlantic
DANIEL VEGHTE, Swarup China, Joseph Charnawskas, Daniel Bonanno, Johannes Weis, Ryan Moffet, Mary Gilles, Daniel Knopf, Jian Wang, Alexander Laskin, Pacific Northwest National Laboratory
Abstract Number: 1031 Working Group: Remote/Regional Atmospheric Aerosol
Abstract Atmospheric particles collected at varying altitudes in the remote region of the Azores archipelago were characterized using chemical imaging techniques. The particle samples were collected during the Aerosol and Cloud Experiment in the Eastern North Atlantic (ACE-ENA) field study, onboard the ARM aerial facility platform (G-1 aircraft) and at the ground ENA supersite. The ground site collection allowed for size resolved collection of aerosol particles at sea level utilizing a multistage impactor while sampling aboard the aircraft employed a custom built time resolved aerosol collector. Multi-modal chemical imaging of particles was performed using complementary capabilities of electron microscopy and scanning transmission X-ray microscopy. Additionally, high resolution mass spectrometry was used to characterize the chemical composition of the organic fraction of collected particles. In additional experiments, collected particles were investigated by in-situ electron microscopy to determine volatility, ice nucleation activity, and water uptake on a single particle basis. Particle sources in the marine environment include regional sea spray, new particle formation, and long-range transport among others. This work demonstrates the impact of different marine aerosol particles collected at distinct layers of the atmosphere through chemical characterization as well as simulating particle properties during the processes of water uptake and ice nucleation.