Effects of SO<sub>2</sub> on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions

Zhang, Wenyu; Wang, Weigang; Li, Junling; Peng, Chao; Li, Kun; Zhou, Li; Shi, Bo; Chen, Yan; Liu, Mingyuan; Ge, Maofa

doi:https://doi.org/10.5194/acp-20-4477-2020

Articles | Volume 20, issue 7

https://doi.org/10.5194/acp-20-4477-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-20-4477-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 7

Research article

|

17 Apr 2020

Research article |

| 17 Apr 2020

Effects of SO₂ on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions

Wenyu Zhang, Weigang Wang, Junling Li, Chao Peng, Kun Li, Li Zhou, Bo Shi, Yan Chen, Mingyuan Liu, and Maofa Ge

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

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RC1: 'Review of acp-2019-540 by W. Zhang et al.', Anonymous Referee #1, 19 Aug 2019
- AC1: 'Responses to Referee #1', Maofa Ge, 30 Oct 2019
RC2: 'Referee's report', Anonymous Referee #2, 17 Sep 2019
- AC2: 'Responses to Referee #2', Maofa Ge, 30 Oct 2019

Peer-review completion

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

AR by Maofa Ge on behalf of the Authors (30 Oct 2019) Author's response Manuscript

ED: Referee Nomination & Report Request started (06 Nov 2019) by Jason Surratt

RR by Anonymous Referee #1 (11 Nov 2019)

Suggestions for revision or reasons for rejection

Comments on “Effects of SO2 on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity” by Zhang et al.

Referee #1

The referee believes that the revised manuscript becomes much better than before and the current form will satisfy almost requirements from referees. However the following minor revisions will still be necessary for the publication:

(1) Referee #2 commented that it has been recently proposed that the toluene oxidation proceeds dominantly via the cresol pathway (Ji et al., 2017). The authors cited this suggested paper, but they did not discuss appropriately. They cited it after the sentence, “small alpha-dicarbonyls compounds such as glyoxal and methyl glyoxal are important intermediate products of toluene that undergo polymerization to produce low-volatility oligomers”, but this paper reports the formation of highly functionalized products such as polyhidroxytoluenes during the toluene oxidation. Please survey previous knowledge of UV/visible absorption spectra for polyhydroxytoluenes (e.g., methylcatechol and methylbenzenetriols), and please consider how polyhydroxytoluenes affect aerosol optical properties to respond the comment. If necessary, please add discussion to the manuscript. Referee #2 suggested that poly hidroxytoluene products are just an example of newly found products. According to knowledge of this referee, other newly found products are highly oxygenated molecules (HOMs) (Molteni et al., 2018, please see the previous reference list of referee #1). In addition to products proposed by Ji et al., it may be useful to discuss whether or not the products found by Molteni et al. affect aerosol optical properties by surveying absorption spectra of organic peroxides.

(2) Line 22, page 2. According to knowledge of this referee, oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen and it contains gases other than NO and NO2. The accurate terminology is “nitrogen oxides (NOx)”.

(3) Line 1, page 3. According to the format, you may need to remove the initial of first name form the citation, “M. Jaoui et al. (2008)”

(4) Line 31, page 3. You might have to insert the following sentence written in your response, “unlike NOx analysers equipped with molybdenum converters, HONO was not detected in T200UP NOx analyzer combined with a patented high efficiency potolytic converter.” to satisfy a requirement from referee #1.

(5) Line 31, page 3. You might have to use the singular for the subject in the sentence, “the concentrations of toluene were measured by a proton transfer reaction quadrupole mass spectrometry…”.

(6) Line 28, page 4. The word, “200”, should be written in the roman font.

(7) Line 38, page 7. A hyphen is missing between “200” and “400”.

(8) Section 3.2. According to a previous comment by referee #1, the subject, “the complex refractive indexes,” in line 2 of page 8 should be “the real part of the complex refractive indexes”. All three abbreviations, RI, appearing in the second paragraph of page 8 should be RI(n).

(9) Line 12, page 9. The word, “oligomerization”, may be better than “polymerization” according to a previous comment by referee #1.

(10) Line 34, page 9. You might want to insert “of the WS condition” after the words, “toluene-derived SOA”.

(11) Figure S3. The vertical axis title, absorption, will be vague. Does it represent the absorbance based on common logarithm?

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ED: Publish subject to minor revisions (review by editor) (10 Feb 2020) by Jason Surratt

AR by Maofa Ge on behalf of the Authors (17 Feb 2020) Author's response Manuscript

ED: Publish as is (13 Mar 2020) by Jason Surratt

AR by Maofa Ge on behalf of the Authors (20 Mar 2020) Manuscript

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Short summary

We investigated the effect of SO₂ under different humidities on optical properties of toluene-derived SOA under four conditions with CRDs and PAX at 532 and 375 nm, respectively. Our results showed that SO₂ under different humidities can change the refractive complex index of toluene SOA by influencing the multiphase processes and altering the aerosol chemical compositions. Different atmospheric conditions could affect the properties of toluene SOA, as well as the global radiative balance.

Effects of SO2 on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions

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Effects of SO₂ on optical properties of secondary organic aerosol generated from photooxidation of toluene under different relative humidity conditions