Two instruments,a nucleation-mode aerosol size spectrometers (NMASS; Williamson et al., 2018), and an ultra-high sensitivity aerosol spectrometers (UHSAS; Kupc et al., 2018) comprise the AMP package for ACCLIP. The AMP package provides particle size distributions with up to one-second time resolution for dry aerosol particles between 0.003 and 1.5 µm in diameter. Details of methods, uncertainties, and data products from the AMP package are in Brock et al. (2019).

During ATom, the instruments were used to investigate how particles in the remote atmosphere influence climate by examining the origin of small particles in the remote atmosphere and their growth to sizes where they can affect clouds and the sources, characteristics, and distribution of soil dust and sea-spray particles, and 3) the importance long-range transport from human and natural sources on background aerosol properties.