Aircraft observations of the chemical composition and aging of aerosol in the Manaus urban plume during GoAmazon 2014/5

Shilling, John E.; Pekour, Mikhail S.; Fortner, Edward C.; Artaxo, Paulo; de Sá, Suzane; Hubbe, John M.; Longo, Karla M.; Machado, Luiz A. T.; Martin, Scot T.; Springston, Stephen R.; Tomlinson, Jason; Wang, Jian

doi:https://doi.org/10.5194/acp-18-10773-2018

Articles | Volume 18, issue 14

https://doi.org/10.5194/acp-18-10773-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5)...

https://doi.org/10.5194/acp-18-10773-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 14

Research article

|

30 Jul 2018

Research article |

| 30 Jul 2018

Aircraft observations of the chemical composition and aging of aerosol in the Manaus urban plume during GoAmazon 2014/5

John E. Shilling, Mikhail S. Pekour, Edward C. Fortner, Paulo Artaxo, Suzane de Sá, John M. Hubbe, Karla M. Longo, Luiz A. T. Machado, Scot T. Martin, Stephen R. Springston, Jason Tomlinson, and Jian Wang

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Interactive discussion

Status: closed

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

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RC1: 'Review on ACP-2018-193', Anonymous Referee #1, 03 Apr 2018
- AC1: 'Response to Reviewers', John Shilling, 26 Jun 2018
RC2: 'Review', Anonymous Referee #2, 08 Apr 2018

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

AR by John Shilling on behalf of the Authors (26 Jun 2018) Author's response Manuscript

ED: Publish as is (12 Jul 2018) by Tuukka Petäjä

AR by John Shilling on behalf of the Authors (17 Jul 2018)

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Short summary

We report aircraft observations of the evolution of organic aerosol in the Manaus urban plume as it ages. We observe dynamic changes in the organic aerosol. The mean carbon oxidation state of the OA increases from −0.6 to −0.45. Hydrocarbon-like organic aerosol (HOA) mass is lost and is balanced out by formation of oxygenated organic aerosol (OOA). Because HOA loss is balanced by OOA formation, we observe little change in the net Δorg / ΔCO values with aging.