Auxiliary Material for Paper 2011JD017153 Isotopic characterization of aerosol organic carbon components over the eastern United States Andrew S. Wozniak Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, Virginia, USA. Now at Department of Chemistry, Old Dominion University, Norfolk, Virginia, USA. James E. Bauer Aquatic Ecology Laboratory, Ohio State University, Columbus, Ohio, USA. Rebecca M. Dickhut Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, Virginia, USA. Li Xu and Ann P. McNichol National Ocean Sciences Accelerator Mass Spectrometry Facility, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA. Wozniak, A. S., J. E. Bauer, R. M. Dickhut, L. Xu, and A. P. McNichol (2012), Isotopic characterization of aerosol organic carbon components over the eastern United States, J. Geophys. Res., 117, D13303, doi:10.1029/2011JD017153. Introduction The auxiliary material contains three files. There is one figure (Figure S1) which contains air mass back trajectories for the sampling dates, times, and locations. Table S1 lists meteorological information for the dates, times, and locations of sample collection. Table S2 lists the air sampling parameters and OC positive artifacts for tests of the air sampler positive artifact. 1. 2011jd017153-fs01.doc Figure S1. Air mass back trajectories for the sampling dates, times, and locations. These were conducted using the NOAA HTSPLIT model. The citations and methods are cited in the figure description. 2. 2011jd017153-ts01.doc Table S1. Lists meteorological information for the dates, times, and locations of sample collection. 2. 2011jd017153-ts03.doc Table S2. Lists the sampling date, sampling durations, face velocities, and calculated organic carbon positive artifacts for tests run using the sampler used in the manuscript to investigate the positive organic carbon artifact. The positive artifact was calculated dividing the organic carbon concentration on a back-up filter by the organic carbon concentration on the front filter and taking the percentage. The face velocities were calculated as the volumetric air sampling rate divided by the exposed area of the filter (419.48 cm2).