NDLI: Response to Reviewer 2 Reviewer 2 comments

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Response to Reviewer 2 Reviewer 2 comments

Content Provider	Semantic Scholar
Copyright Year	2017
Abstract	This paper describes measurements of ambient aerosol and resulting aerosol after photochemical processing of ambient air with a PAM reactor on an island in the Yellow Sea. Measurements were made using an SMPS and high-resolution AMS. Only a 1-week period is shown. Two 1-day periods are compared in more detail, which show large differences in OA/sulfate ratios and air mass origin (SE China vs the Korean Peninsula). Bulk composition, chemically-resolved size distributions, two AMS fragment tracers (m/z 43, m/z 44), and organic elemental ratios were compared between the two periods and between PAM-processed and unperturbed ambient air. Generally, sulfate tended to increase in the PAM, while nitrate and OA decreased. With PAM aging, O/C increased, m/z 43 decreased, and m/z 44 was relatively unchanged. The authors conclude that SO2 and sulfate production play a key role in controlling secondary aerosol formation and CCN in East Asia based on this analysis. This paper is one of just a few that have explored the transformation of ambient aerosols (and ambient aerosol precursors that may form new aerosols) upon exposure to OH in near real-time with a fast flow reactor. The topic is relevant to current atmospheric chemistry research and ACP is a good fit for it. However, the analyses in the paper completely ignore important aspects of the chemistry and physics going on in the reactor, which have been discussed in the published literature over the past several years. Analysis critical to the credibility of the results, such as a comparison of the amount of sulfate produced in the reactor vs. that predicted by a simple kinetic model, are completely missing.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.atmos-chem-phys-discuss.net/acp-2016-1133/acp-2016-1133-AC2-supplement.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Letter

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