For this new version of the 1s HR-ToF-AMS data, changes are small, ~1-2% lower for all species, but are higher for chloride (~20% lower). In detail:

1. Corrections were made to account for 2 recently discovered vaporizer effects; a) correction for a small positive bias on CO2+ from NH4NO3, resulting in a ~1-2% change in concentrations (see Pieber et al., ES&T, 2016 DOI: 10.1021/acs.est.6b01035 for specific details), and b) an overestimation of the chloride concentration from a similar effect that was recently discovered by our group (Hu et al., AS&T, submitted). We can provide more details if interested.
2. In addition to these corrections, the collection efficiency (CE) we typically use is from our 1 minute data product, to reduce noise. However, CE is dependent on particle acidity, and since we frequently sampled power plant plumes during WINTER, I incorporated the use of CE from our 1 second data product to capture the rapidly changing particle acidity within the short sampling times of power plant plumes. This should improve analyses of changes in species concentrations as we cross such plumes.

This is the final data. Users are strongly encouraged to contact PI for proper data use. There are corrected detection limits in this version of the data.