Continuous measurements at the urban roadside in an Asian megacity by  Aerosol Chemical Speciation Monitor (ACSM): particulate matter  characteristics during fall and winter seasons in Hong Kong

Sun, C.; Lee, B. P.; Huang, D.; Jie Li, Y.; Schurman, M. I.; Louie, P. K. K.; Luk, C.; Chan, C. K.

doi:https://doi.org/10.5194/acp-16-1713-2016

Articles | Volume 16, issue 3

https://doi.org/10.5194/acp-16-1713-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-16-1713-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 16, issue 3

Research article

|

15 Feb 2016

Research article |

| 15 Feb 2016

Continuous measurements at the urban roadside in an Asian megacity by Aerosol Chemical Speciation Monitor (ACSM): particulate matter characteristics during fall and winter seasons in Hong Kong

C. Sun, B. P. Lee, D. Huang, Y. Jie Li, M. I. Schurman, P. K. K. Louie, C. Luk, and C. K. Chan

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Final revised paper (published on 15 Feb 2016)
Supplement to the final revised paper
Preprint (discussion started on 16 Jul 2015)
Supplement to the preprint

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC C5766: 'Reviewer's comments', Anonymous Referee #1, 10 Aug 2015
- AC C7861: 'Response to anonymous referee #1', Berto Lee, 12 Oct 2015
RC C6167: 'Review of Sun et al.', Anonymous Referee #2, 23 Aug 2015
- AC C7863: 'Response to anonymous referee #2', Berto Lee, 12 Oct 2015

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Berto Lee on behalf of the Authors (15 Oct 2015) Author's response Manuscript

ED: Referee Nomination & Report Request started (31 Oct 2015) by Nga Lee Ng

RR by Anonymous Referee #2 (29 Dec 2015)

Suggestions for revision or reasons for rejection

The authors have addressed my concerns about the possible impact of local biomass burning at this site well . It would be helpful if the authors clarified a couple more minor issues associated with this:

1) Figure 1 of the authors response shows that the diurnal cycles of 60 and 73 are similar to that of COA. This should be included in the supplementary since it is important to show that the existence of these ions in the COA factor MS is not simply due to inadequate factor separation in PMF.

In line 809 the authors state " This indicates that these two ions at Mong Kok were 809 mainly imbedded in cooking emissions and background aerosol due to transport rather than in a distinct source with further details shown in the supplement (Sect. 6)."

One thing that is still not clear to me is why 60 and 73 signals have the same diurnal cycle as COA (a local source) if they are transported. Is it possible that this similarity in trends indicates that at least some of the cooking is done on a wood fire which will result in a co-emission of 60 and 73? It would be useful if the authors addressed this with a sentence.

2) Authors should point out in manuscript that there is also another potential source of 60 and 73 that has been identified by Wang et al. in their manuscript ("Characterization of organic aerosol produced during pulverized coal combustion in a drop tube furnace", Atmos. Chem. Phys., 13, 10919–10932, 2013) which has also recently been shown to be a source of m/z 60 and m/z 73.)

3) At the end of sentence at line 809 it would be useful if the authors explicitly state something like " This indicates that SV-OOA is potentially impacted by transported biomass burning aerosol and/or coal burning

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ED: Reconsider after minor revisions (Editor review) (09 Jan 2016) by Nga Lee Ng

AR by Berto Lee on behalf of the Authors (13 Jan 2016) Author's response

ED: Publish as is (15 Jan 2016) by Nga Lee Ng

AR by Berto Lee on behalf of the Authors (25 Jan 2016)

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Short summary

This study presents results of long-term submicron aerosol measurements in Hong Kong. The presented work covers fall and winter 2013. It serves to characterize aerosol in a densely built-up urban area of a typical Asian megacity with strong primary emission sources from vehicles and cooking and presents an in-depth analysis of distinct clean and heavily polluted time periods tied with meteorological data and other gas-phase species observed in the study period.